diff --git a/crates/rattler_build_jinja/src/variable.rs b/crates/rattler_build_jinja/src/variable.rs
index b4a958f4e..0cef66165 100644
--- a/crates/rattler_build_jinja/src/variable.rs
+++ b/crates/rattler_build_jinja/src/variable.rs
@@ -62,6 +62,36 @@ impl Variable {
     pub fn from_string(value: &str) -> Self {
         Variable(Value::from_safe_string(value.to_string()))
     }
+
+    /// Try to extract as a boolean value using serde deserialization
+    pub fn as_bool(&self) -> Option<bool> {
+        bool::deserialize(self.0.clone()).ok()
+    }
+
+    /// Try to extract as an i64 value using serde deserialization
+    pub fn as_i64(&self) -> Option<i64> {
+        i64::deserialize(self.0.clone()).ok()
+    }
+
+    /// Check if this variable is a number
+    pub fn is_number(&self) -> bool {
+        self.0.is_number()
+    }
+
+    /// Try to extract as a string slice
+    pub fn as_str(&self) -> Option<&str> {
+        self.0.as_str()
+    }
+
+    /// Check if this is a sequence/list
+    pub fn is_sequence(&self) -> bool {
+        self.0.len().is_some() && self.0.as_str().is_none()
+    }
+
+    /// Try to iterate over the variable if it's a sequence
+    pub fn try_iter(&self) -> Result<impl Iterator<Item = Value> + '_, minijinja::Error> {
+        self.0.try_iter()
+    }
 }
 
 impl Display for Variable {
diff --git a/crates/rattler_build_script/Cargo.toml b/crates/rattler_build_script/Cargo.toml
index 90bb5c35b..6be370eaf 100644
--- a/crates/rattler_build_script/Cargo.toml
+++ b/crates/rattler_build_script/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 authors.workspace = true
 edition.workspace = true
 license.workspace = true
-readme = "README.md"
+readme.workspace = true
 repository.workspace = true
 description = "Script execution and data model for rattler-build"
 
diff --git a/py-rattler-build/Cargo.lock b/py-rattler-build/Cargo.lock
index c7335cffe..96c7a57db 100644
--- a/py-rattler-build/Cargo.lock
+++ b/py-rattler-build/Cargo.lock
@@ -1464,16 +1464,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "diffy"
-version = "0.4.2"
-source = "git+https://github.com/prefix-dev/diffy.git?branch=master#f916e25c31a8d9e7483116c9e8aa6a36e20f947a"
-dependencies = [
- "nu-ansi-term",
- "strsim",
- "thiserror 2.0.17",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
@@ -1960,15 +1950,6 @@ dependencies = [
  "slab",
 ]
 
-[[package]]
-name = "fxhash"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c31b6d751ae2c7f11320402d34e41349dd1016f8d5d45e48c4312bc8625af50c"
-dependencies = [
- "byteorder",
-]
-
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -2078,7 +2059,7 @@ dependencies = [
  "futures-core",
  "futures-sink",
  "http 1.3.1",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "slab",
  "tokio",
  "tokio-util",
@@ -2253,7 +2234,8 @@ dependencies = [
 [[package]]
 name = "http-range-client"
 version = "0.9.1"
-source = "git+https://github.com/pka/http-range-client.git#fccfa852dbe7e875a50802c55ee6c5f69c634827"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d5f72a73344fc9576e74e42a0f1d7a05d7c6c50950a15f44faea133a91f622b"
 dependencies = [
  "async-trait",
  "byteorder",
@@ -2542,9 +2524,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.11.4"
+version = "2.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b0f83760fb341a774ed326568e19f5a863af4a952def8c39f9ab92fd95b88e5"
+checksum = "6717a8d2a5a929a1a2eb43a12812498ed141a0bcfb7e8f7844fbdbe4303bba9f"
 dependencies = [
  "equivalent",
  "hashbrown 0.16.0",
@@ -3319,6 +3301,15 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 
+[[package]]
+name = "ordered-float"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68f19d67e5a2795c94e73e0bb1cc1a7edeb2e28efd39e2e1c9b7a40c1108b11c"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "ordered-multimap"
 version = "0.7.3"
@@ -3424,13 +3415,13 @@ checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
 
 [[package]]
 name = "path_resolver"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67957e099f5b76f4cad98e0d41dd53746ab3a2debc1da12ee5b1cccb1d7b8dc8"
+checksum = "3604448dbdd00c6884479c066f040f503bf26f6b58de5358b5d2376ef4e78d11"
 dependencies = [
+ "ahash",
  "fs-err",
- "fxhash",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "itertools 0.14.0",
  "proptest",
  "tempfile",
@@ -3457,7 +3448,7 @@ checksum = "8701b58ea97060d5e5b155d383a69952a60943f0e6dfe30b04c287beb0b27455"
 dependencies = [
  "fixedbitset",
  "hashbrown 0.15.5",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "serde",
 ]
 
@@ -3533,7 +3524,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "740ebea15c5d1428f910cd1a5f52cebf8d25006245ed8ade92702f4943d91e07"
 dependencies = [
  "base64",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "quick-xml 0.38.3",
  "serde",
  "time",
@@ -3641,22 +3632,33 @@ dependencies = [
 
 [[package]]
 name = "py-rattler-build"
-version = "0.48.1"
+version = "0.49.0"
 dependencies = [
  "chrono",
  "clap",
+ "fs-err",
+ "indexmap 2.12.0",
+ "indicatif",
  "miette",
  "pyo3",
  "pyo3-build-config",
  "pythonize",
  "rattler-build",
+ "rattler_build_jinja",
+ "rattler_build_recipe",
+ "rattler_build_types",
+ "rattler_build_variant_config",
  "rattler_conda_types",
  "rattler_config",
  "rattler_networking",
+ "rattler_solve",
  "rattler_upload",
+ "rattler_virtual_packages",
  "serde_json",
  "thiserror 2.0.17",
  "tokio",
+ "tracing",
+ "tracing-subscriber",
  "url",
 ]
 
@@ -3904,9 +3906,9 @@ dependencies = [
 
 [[package]]
 name = "rattler"
-version = "0.37.7"
+version = "0.38.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83d5fa5c5cb08baeeed48085bbe553b418f532907dbb10a23fac4961a309efcb"
+checksum = "97a2c731b4989ca74615b05f308a63664b6e7592a621a58fb5267b51a8239273"
 dependencies = [
  "anyhow",
  "clap",
@@ -3916,7 +3918,7 @@ dependencies = [
  "fs-err",
  "futures",
  "humantime",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "indicatif",
  "itertools 0.14.0",
  "memchr",
@@ -3949,9 +3951,8 @@ dependencies = [
 
 [[package]]
 name = "rattler-build"
-version = "0.48.1"
+version = "0.49.0"
 dependencies = [
- "anyhow",
  "async-once-cell",
  "async-recursion",
  "base64",
@@ -3965,7 +3966,6 @@ dependencies = [
  "console",
  "content_inspector",
  "dialoguer",
- "diffy",
  "dunce",
  "flate2",
  "fs-err",
@@ -3975,25 +3975,25 @@ dependencies = [
  "hex",
  "http-range-client",
  "ignore",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "indicatif",
  "itertools 0.14.0",
  "lazy_static",
  "line-ending",
- "marked-yaml",
  "memchr",
  "memmap2",
  "miette",
  "minijinja",
  "num_cpus",
- "opendal",
  "pathdiff",
  "petgraph",
  "rattler",
+ "rattler_build_diffy",
  "rattler_build_jinja",
  "rattler_build_networking",
  "rattler_build_recipe",
  "rattler_build_recipe_generator",
+ "rattler_build_script",
  "rattler_build_source_cache",
  "rattler_build_types",
  "rattler_build_variant_config",
@@ -4006,6 +4006,7 @@ dependencies = [
  "rattler_menuinst",
  "rattler_networking",
  "rattler_package_streaming",
+ "rattler_prefix_guard",
  "rattler_redaction",
  "rattler_repodata_gateway",
  "rattler_shell",
@@ -4045,16 +4046,25 @@ dependencies = [
  "walkdir",
  "which",
  "xz2",
- "zip 6.0.0",
+ "zip",
  "zstd",
 ]
 
+[[package]]
+name = "rattler_build_diffy"
+version = "0.4.2"
+dependencies = [
+ "nu-ansi-term",
+ "strsim",
+ "thiserror 2.0.17",
+]
+
 [[package]]
 name = "rattler_build_jinja"
 version = "0.1.0"
 dependencies = [
  "fs-err",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "itertools 0.14.0",
  "lazy_static",
  "minijinja",
@@ -4085,21 +4095,27 @@ version = "0.1.0"
 dependencies = [
  "fs-err",
  "globset",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "itertools 0.14.0",
  "marked-yaml",
  "miette",
  "minijinja",
  "pathdiff",
+ "petgraph",
  "rattler_build_jinja",
+ "rattler_build_script",
  "rattler_build_types",
+ "rattler_build_variant_config",
+ "rattler_build_yaml_parser",
  "rattler_conda_types",
  "rattler_digest",
  "regex",
  "serde",
+ "serde-value",
  "serde_json",
  "serde_with",
  "serde_yaml",
+ "sha1",
  "spdx",
  "thiserror 2.0.17",
  "url",
@@ -4114,7 +4130,7 @@ dependencies = [
  "clap",
  "flate2",
  "fs-err",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "itertools 0.14.0",
  "miette",
  "rattler_conda_types",
@@ -4131,7 +4147,28 @@ dependencies = [
  "toml",
  "tracing",
  "url",
- "zip 6.0.0",
+ "zip",
+]
+
+[[package]]
+name = "rattler_build_script"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "console",
+ "fs-err",
+ "futures",
+ "indexmap 2.12.0",
+ "itertools 0.14.0",
+ "minijinja",
+ "rattler_conda_types",
+ "rattler_shell",
+ "serde",
+ "thiserror 2.0.17",
+ "tokio",
+ "tokio-util",
+ "tracing",
+ "which",
 ]
 
 [[package]]
@@ -4166,7 +4203,7 @@ dependencies = [
  "url",
  "walkdir",
  "xz2",
- "zip 6.0.0",
+ "zip",
  "zstd",
 ]
 
@@ -4174,6 +4211,7 @@ dependencies = [
 name = "rattler_build_types"
 version = "0.1.0"
 dependencies = [
+ "globset",
  "itertools 0.14.0",
  "rattler_conda_types",
  "serde",
@@ -4193,6 +4231,7 @@ dependencies = [
  "minijinja",
  "rattler_build_jinja",
  "rattler_build_types",
+ "rattler_build_yaml_parser",
  "rattler_conda_types",
  "serde",
  "serde_yaml",
@@ -4200,12 +4239,24 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "rattler_build_yaml_parser"
+version = "0.1.0"
+dependencies = [
+ "marked-yaml",
+ "miette",
+ "rattler_build_jinja",
+ "serde",
+ "thiserror 2.0.17",
+]
+
 [[package]]
 name = "rattler_cache"
-version = "0.3.37"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d8ad71f498394644bea221feb51e9d8b2a03deaba4790d6419e018c19edddf4d"
+checksum = "94e25b6c05b42228a55cd58a11d91af92819b03c9c604cbc7a83568ced7e2db2"
 dependencies = [
+ "ahash",
  "anyhow",
  "dashmap",
  "digest",
@@ -4213,7 +4264,6 @@ dependencies = [
  "fs-err",
  "fs4",
  "futures",
- "fxhash",
  "itertools 0.14.0",
  "parking_lot 0.12.5",
  "rattler_conda_types",
@@ -4235,19 +4285,19 @@ dependencies = [
 
 [[package]]
 name = "rattler_conda_types"
-version = "0.40.0"
+version = "0.40.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3af51ac4106816d06479ece090aa4842d94c1ef1f2dfb746a2568f2ea23ec642"
+checksum = "0c4a129c8b0f43f700b43af71fcbf17fae058e0840c8a610d354355a552eb36e"
 dependencies = [
+ "ahash",
  "chrono",
  "core-foundation 0.10.1",
  "dirs",
  "file_url",
  "fs-err",
- "fxhash",
  "glob",
  "hex",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "itertools 0.14.0",
  "lazy-regex",
  "memmap2",
@@ -4277,13 +4327,13 @@ dependencies = [
 
 [[package]]
 name = "rattler_config"
-version = "0.2.11"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bcfbee1e19ccbb950f3d29ed6957d4f5ef9c5b2043f44e38bb671734a47bbdd"
+checksum = "c6ecabc1466577e0d2d8c6d66c3e2bd64992f51d49dabe1815fedbf13ed6b930"
 dependencies = [
  "console",
  "fs-err",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "rattler_conda_types",
  "serde",
  "serde_json",
@@ -4295,9 +4345,9 @@ dependencies = [
 
 [[package]]
 name = "rattler_digest"
-version = "1.1.5"
+version = "1.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f40b746768824bc3306dcb597e549e836eda023dab8d7407d32b9f342c70cc5d"
+checksum = "886e9a6254e74a830c2b8555e14862d6b2f4cc498b43767d4adf1c71421a4796"
 dependencies = [
  "blake2",
  "digest",
@@ -4305,6 +4355,7 @@ dependencies = [
  "hex",
  "md-5",
  "serde",
+ "serde_bytes",
  "serde_with",
  "sha2",
  "tokio",
@@ -4332,10 +4383,11 @@ dependencies = [
 
 [[package]]
 name = "rattler_index"
-version = "0.25.5"
+version = "0.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5851820dea17939da687656ec73fcc30e61a942f88cddcfdcedf4311d0b7fa8c"
+checksum = "2eb036f08ec548e6809060d9f989264624fa098a2d5ad13e829b02377d90cd68"
 dependencies = [
+ "ahash",
  "anyhow",
  "bytes",
  "chrono",
@@ -4344,7 +4396,7 @@ dependencies = [
  "console",
  "fs-err",
  "futures",
- "fxhash",
+ "indexmap 2.12.0",
  "indicatif",
  "opendal",
  "rattler_conda_types",
@@ -4353,6 +4405,7 @@ dependencies = [
  "rattler_package_streaming",
  "rattler_s3",
  "reqwest",
+ "retry-policies 0.4.0",
  "rmp-serde",
  "serde",
  "serde_json",
@@ -4377,9 +4430,9 @@ dependencies = [
 
 [[package]]
 name = "rattler_menuinst"
-version = "0.2.29"
+version = "0.2.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c88b95e91763fb996f6c7bb68ffc6b2e9e5050f71eae66552db1b246e0cf1839"
+checksum = "84487b67092b6624ade384f4a22adb287fee9042d2e18c50714ca947d69d3879"
 dependencies = [
  "chrono",
  "configparser",
@@ -4407,9 +4460,9 @@ dependencies = [
 
 [[package]]
 name = "rattler_networking"
-version = "0.25.16"
+version = "0.25.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "63b84d760de2bc2fd6c4385ef8f0fd4017b8b96e961c76b5a91b46dbbf775b92"
+checksum = "e6937ea4ebf9b46051a96fc061199e7a81e1debfd6a7558e110f400bf8dc054b"
 dependencies = [
  "anyhow",
  "async-once-cell",
@@ -4439,9 +4492,9 @@ dependencies = [
 
 [[package]]
 name = "rattler_package_streaming"
-version = "0.23.7"
+version = "0.23.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f9b332c3e7ee6f9ee631aab31aa725022828928a61d5cb5755f2d6df36778f1"
+checksum = "0778a02ff0cddc56836f325bd5365cdf3d7357570a8b9f21f6fd590452b39814"
 dependencies = [
  "bzip2",
  "chrono",
@@ -4463,7 +4516,7 @@ dependencies = [
  "tokio-util",
  "tracing",
  "url",
- "zip 4.0.0",
+ "zip",
  "zstd",
 ]
 
@@ -4481,13 +4534,14 @@ dependencies = [
 
 [[package]]
 name = "rattler_pty"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76a7edbf8f23a099ccb32cc4f024886e35a873c462ca83f86c286556c275bf06"
+checksum = "86a84e6b351c46c7588bb8f5c90994be23d5c3c31cf87f9ec903cd91d9fc4246"
 dependencies = [
  "libc",
  "nix 0.30.1",
  "signal-hook",
+ "tokio",
 ]
 
 [[package]]
@@ -4503,9 +4557,9 @@ dependencies = [
 
 [[package]]
 name = "rattler_repodata_gateway"
-version = "0.24.7"
+version = "0.24.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bad405e92e9d9152b6cf94094ddbb669789002693f133d1929de21256587bcce"
+checksum = "410e796a90104cb4416f24955816dd2cdd9727b08b18972a32dde730e13264b3"
 dependencies = [
  "anyhow",
  "async-compression",
@@ -4563,9 +4617,9 @@ dependencies = [
 
 [[package]]
 name = "rattler_s3"
-version = "0.1.5"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa31673d20d2ff299917bf24b9b7d8c3ed5b670c2d39efee5d1680c8113854f8"
+checksum = "9af38d8d347a5cfe4af89cb7146006691237d051c17c7915a977575116a8a1b2"
 dependencies = [
  "aws-config",
  "aws-credential-types",
@@ -4580,14 +4634,14 @@ dependencies = [
 
 [[package]]
 name = "rattler_shell"
-version = "0.25.2"
+version = "0.25.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6d07812fc58b55efd6142e8142eaa2088792a3e9b1396b087d964dc34b11d1f"
+checksum = "be1ebf3ab404de7616429f74f5d5fca00eaaf9df535706613bab42b44bdacd13"
 dependencies = [
  "anyhow",
  "enum_dispatch",
  "fs-err",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "itertools 0.14.0",
  "rattler_conda_types",
  "rattler_pty",
@@ -4601,9 +4655,9 @@ dependencies = [
 
 [[package]]
 name = "rattler_solve"
-version = "3.0.5"
+version = "3.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fe4775890c2be1a927a17b8a4a6383358a403563a0283e35f2fff460de44def"
+checksum = "44ebabdec0f11bfe534f6a63f5d49cd4e7647ea029c751821c2ab36e558a97a0"
 dependencies = [
  "chrono",
  "futures",
@@ -4619,9 +4673,9 @@ dependencies = [
 
 [[package]]
 name = "rattler_upload"
-version = "0.3.4"
+version = "0.3.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "771707ed3bf3e0962802193a7dada6cb9e71614def41fb3a72f88011cb136a90"
+checksum = "2fa36a0f044d805785aafc77e7eec392f8c3e65441166893934a3b95cb735329"
 dependencies = [
  "base64",
  "clap",
@@ -4655,9 +4709,9 @@ dependencies = [
 
 [[package]]
 name = "rattler_virtual_packages"
-version = "2.2.1"
+version = "2.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "299c16885487278a7d305634e4a58512bf0fc4b052623d033cc05fa6cd1255e9"
+checksum = "2debe854ed9ecdf446b976ceac16c4cce14b8c69dd0731a5d9579ee59ec731b7"
 dependencies = [
  "archspec",
  "libloading",
@@ -4925,7 +4979,7 @@ dependencies = [
  "elsa",
  "event-listener",
  "futures",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "itertools 0.14.0",
  "petgraph",
  "tracing",
@@ -5295,6 +5349,26 @@ dependencies = [
  "typeid",
 ]
 
+[[package]]
+name = "serde-value"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3a1a3341211875ef120e117ea7fd5228530ae7e7036a779fdc9117be6b3282c"
+dependencies = [
+ "ordered-float",
+ "serde",
+]
+
+[[package]]
+name = "serde_bytes"
+version = "0.11.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5d440709e79d88e51ac01c4b72fc6cb7314017bb7da9eeff678aa94c10e3ea8"
+dependencies = [
+ "serde",
+ "serde_core",
+]
+
 [[package]]
 name = "serde_core"
 version = "1.0.228"
@@ -5321,7 +5395,7 @@ version = "1.0.145"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "402a6f66d8c709116cf22f558eab210f5a50187f702eb4d7e5ef38d9a7f1c79c"
 dependencies = [
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "itoa",
  "memchr",
  "ryu",
@@ -5371,7 +5445,7 @@ dependencies = [
  "chrono",
  "hex",
  "indexmap 1.9.3",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "schemars 0.9.0",
  "schemars 1.0.4",
  "serde_core",
@@ -5398,7 +5472,7 @@ version = "0.9.34+deprecated"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a8b1a1a2ebf674015cc02edccce75287f1a0130d394307b36743c2f5d504b47"
 dependencies = [
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "itoa",
  "ryu",
  "serde",
@@ -5978,7 +6052,7 @@ version = "0.9.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "00e5e5d9bf2475ac9d4f0d9edab68cc573dc2fd644b0dba36b0c30a92dd9eaa0"
 dependencies = [
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "serde_core",
  "serde_spanned",
  "toml_datetime",
@@ -6002,7 +6076,7 @@ version = "0.23.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f3effe7c0e86fdff4f69cdd2ccc1b96f933e24811c5441d44904e8683e27184b"
 dependencies = [
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "toml_datetime",
  "toml_parser",
  "winnow",
@@ -7313,21 +7387,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "zip"
-version = "4.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "153a6fff49d264c4babdcfa6b4d534747f520e56e8f0f384f3b808c4b64cc1fd"
-dependencies = [
- "arbitrary",
- "crc32fast",
- "flate2",
- "indexmap 2.11.4",
- "memchr",
- "time",
- "zopfli",
-]
-
 [[package]]
 name = "zip"
 version = "6.0.0"
@@ -7337,8 +7396,9 @@ dependencies = [
  "arbitrary",
  "crc32fast",
  "flate2",
- "indexmap 2.11.4",
+ "indexmap 2.12.0",
  "memchr",
+ "time",
  "zopfli",
 ]
 
diff --git a/py-rattler-build/Cargo.toml b/py-rattler-build/Cargo.toml
index e3e582f46..52f65a696 100644
--- a/py-rattler-build/Cargo.toml
+++ b/py-rattler-build/Cargo.toml
@@ -16,6 +16,11 @@ rustls-tls = ["rattler-build/rustls-tls"]
 
 [dependencies]
 rattler-build = { path = "../" }
+rattler_build_recipe = { path = "../crates/rattler_build_recipe" }
+rattler_build_jinja = { path = "../crates/rattler_build_jinja" }
+rattler_build_types = { path = "../crates/rattler_build_types" }
+rattler_build_variant_config = { path = "../crates/rattler_build_variant_config" }
+indexmap = "2.11.4"
 pyo3 = { version = "0.26.0", features = [
   "abi3-py38",
   "extension-module",
@@ -31,6 +36,8 @@ tokio = { version = "1.47.1", features = [
 rattler_conda_types = "0.40.0"
 rattler_config = "0.2.11"
 rattler_networking = { version = "0.25.15" }
+rattler_solve = "3.0.9"
+rattler_virtual_packages = "2.2.5"
 clap = "4.5.48"
 url = "2.5.7"
 chrono = "0.4.42"
@@ -39,6 +46,10 @@ miette = "7.6.0"
 serde_json = "1.0.145"
 pythonize = "0.26.0"
 thiserror = "2.0.17"
+fs-err = "3.1.3"
+tracing = "0.1"
+tracing-subscriber = "0.3"
+indicatif = "0.18"
 
 [build-dependencies]
 pyo3-build-config = "0.26.0"
diff --git a/py-rattler-build/examples/build_with_progress.py b/py-rattler-build/examples/build_with_progress.py
new file mode 100644
index 000000000..4e98d1c98
--- /dev/null
+++ b/py-rattler-build/examples/build_with_progress.py
@@ -0,0 +1,149 @@
+#!/usr/bin/env python3
+"""
+Example: Building a recipe with progress reporting using Rich.
+
+This example demonstrates how to use rattler-build's progress reporting
+capabilities with the Rich library for beautiful terminal output.
+
+Usage:
+    python build_with_progress.py recipe.yaml
+
+Requirements:
+    pip install rich
+"""
+
+import sys
+from pathlib import Path
+import tempfile
+
+# Import rattler_build components
+from rattler_build.stage0 import Recipe
+from rattler_build.variant_config import VariantConfig
+from rattler_build.render import RenderConfig, render_recipe
+from rattler_build.progress import RichProgressCallback, SimpleProgressCallback
+
+
+def build_recipe_with_rich_progress(recipe_path: Path):
+    """Build a recipe with Rich progress display.
+
+    Args:
+        recipe_path: Path to the recipe YAML file
+    """
+    print(f"🔍 Loading recipe from {recipe_path}")
+
+    # Load the recipe
+    recipe = Recipe.from_file(str(recipe_path))
+    print(f"✅ Loaded recipe: {recipe.package.name} {recipe.package.version}")
+
+    # Configure variant rendering
+    variant_config = VariantConfig()
+    # Set recipe_path so the build can find license files, etc.
+    render_config = RenderConfig(recipe_path=str(recipe_path.parent))
+
+    print("\n📋 Rendering recipe variants...")
+    rendered_variants = render_recipe(recipe, variant_config, render_config)
+    print(f"✅ Rendered {len(rendered_variants)} variant(s)")
+
+    # Build each variant with progress reporting
+    for i, variant in enumerate(rendered_variants, 1):
+        print(f"\n🔨 Building variant {i}/{len(rendered_variants)}")
+        stage1_recipe = variant.recipe()
+        package = stage1_recipe.package
+        build = stage1_recipe.build
+        print(f"   Package: {package.name}")
+        print(f"   Version: {package.version}")
+        print(f"   Build string: {build.string}")
+
+        # Use Rich progress callback for beautiful output
+        # Set show_logs=True to see all log messages (recommended!)
+        with RichProgressCallback(show_logs=True) as callback:
+            print("\n" + "=" * 60)
+            print("Starting build with progress reporting...")
+            print("=" * 60 + "\n")
+
+            # Build with real progress callbacks!
+            import tempfile
+
+            with tempfile.TemporaryDirectory() as tmpdir:
+                variant.run_build(
+                    progress_callback=callback, keep_build=False, output_dir=Path(tmpdir), recipe_path=recipe_path
+                )
+
+    print("\n✅ Build complete!")
+
+
+def build_recipe_with_simple_progress(recipe_path: Path):
+    """Build a recipe with simple console progress display.
+
+    Args:
+        recipe_path: Path to the recipe YAML file
+    """
+    print(f"🔍 Loading recipe from {recipe_path}")
+
+    # Load the recipe
+    recipe = Recipe.from_file(str(recipe_path))
+    print(f"✅ Loaded recipe: {recipe.package.name} {recipe.package.version}")
+
+    # Configure and render
+    variant_config = VariantConfig()
+    # Set recipe_path so the build can find license files, etc.
+    render_config = RenderConfig(recipe_path=str(recipe_path.parent))
+
+    print("\n📋 Rendering recipe variants...")
+    rendered_variants = render_recipe(recipe, variant_config, render_config)
+    print(f"✅ Rendered {len(rendered_variants)} variant(s)")
+
+    # Build with simple callback
+    callback = SimpleProgressCallback()
+
+    for i, variant in enumerate(rendered_variants, 1):
+        print(f"\n🔨 Building variant {i}/{len(rendered_variants)}")
+
+        # Build with real progress callbacks!
+        with tempfile.TemporaryDirectory() as tmpdir:
+            variant.run_build(
+                progress_callback=callback, keep_build=False, output_dir=Path(tmpdir), recipe_dir=recipe_path.parent
+            )
+
+    print("\n✅ Build complete!")
+
+
+def main():
+    """Main entry point."""
+    if len(sys.argv) < 2:
+        print("Usage: python build_with_progress.py <recipe.yaml> [--simple]")
+        print("\nOptions:")
+        print("  --simple    Use simple console output instead of Rich")
+        print("\nExamples:")
+        print("  python build_with_progress.py recipe.yaml")
+        print("  python build_with_progress.py recipe.yaml --simple")
+        sys.exit(1)
+
+    recipe_path = Path(sys.argv[1])
+    if not recipe_path.exists():
+        print(f"Error: Recipe file not found: {recipe_path}")
+        sys.exit(1)
+
+    use_simple = "--simple" in sys.argv
+
+    try:
+        if use_simple:
+            build_recipe_with_simple_progress(recipe_path)
+        else:
+            try:
+                build_recipe_with_rich_progress(recipe_path)
+            except ImportError as e:
+                print(f"Rich library not available: {e}")
+                print("Falling back to simple progress...")
+                build_recipe_with_simple_progress(recipe_path)
+
+    except Exception as e:
+        print(f"❌ Error: {e}")
+        import traceback
+
+        traceback.print_exc()
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/py-rattler-build/examples/recipe/simple.yaml b/py-rattler-build/examples/recipe/simple.yaml
new file mode 100644
index 000000000..f1eb5c628
--- /dev/null
+++ b/py-rattler-build/examples/recipe/simple.yaml
@@ -0,0 +1,7 @@
+package:
+  name: foobar
+  version: 1.2.3
+
+build:
+  script:
+    - echo "Building foobar version 1.2.3"
diff --git a/py-rattler-build/pixi.lock b/py-rattler-build/pixi.lock
index fe5c78561..44a642b6e 100644
--- a/py-rattler-build/pixi.lock
+++ b/py-rattler-build/pixi.lock
@@ -747,28 +747,45 @@ environments:
       linux-64:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
       - conda: https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-2_gnu.tar.bz2
-      - conda: https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.1.0-py38h17151c0_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/asttokens-3.0.0-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/backports.asyncio.runner-1.2.0-pyhe01879c_2.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.2.0-py310h8cfb67f_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-hda65f42_8.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2025.10.5-hbd8a1cb_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/certifi-2024.8.30-pyhd8ed1ab_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/linux-64/cffi-1.17.0-py38heb5c249_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.0-pyhd8ed1ab_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/click-8.1.7-unix_pyh707e725_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_0.tar.bz2
-      - conda: https://conda.anaconda.org/conda-forge/noarch/exceptiongroup-1.2.2-pyhd8ed1ab_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/h2-4.1.0-pyhd8ed1ab_0.tar.bz2
-      - conda: https://conda.anaconda.org/conda-forge/noarch/hpack-4.0.0-pyh9f0ad1d_0.tar.bz2
-      - conda: https://conda.anaconda.org/conda-forge/noarch/hyperframe-6.0.1-pyhd8ed1ab_0.tar.bz2
-      - conda: https://conda.anaconda.org/conda-forge/noarch/idna-3.10-pyhd8ed1ab_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/iniconfig-2.0.0-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/certifi-2025.10.5-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/cffi-2.0.0-py310he7384ee_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.4-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/click-8.3.0-pyh707e725_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/comm-0.2.3-pyhe01879c_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/debugpy-1.8.17-py310h25320af_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/decorator-5.2.1-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/exceptiongroup-1.3.0-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/executing-2.2.1-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/h2-4.3.0-pyhcf101f3_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/hpack-4.1.0-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/hyperframe-6.1.0-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/idna-3.11-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-8.7.0-pyhe01879c_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/iniconfig-2.3.0-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/inline-snapshot-0.31.0-pyhcf101f3_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/ipykernel-7.1.0-pyha191276_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/ipython-8.37.0-pyh8f84b5b_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/jedi-0.19.2-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/jupyter_client-8.6.3-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/jupyter_core-5.9.1-pyhc90fa1f_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/keyutils-1.6.3-hb9d3cd8_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/krb5-1.21.3-h659f571_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.44-h1aa0949_4.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libedit-3.1.20250104-pl5321h7949ede_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libexpat-2.7.1-hecca717_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libffi-3.5.2-h9ec8514_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libgcc-15.2.0-h767d61c_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-15.2.0-h69a702a_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libgomp-15.2.0-h767d61c_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/liblzma-5.8.1-hb9d3cd8_2.conda
-      - conda: https://conda.anaconda.org/conda-forge/linux-64/liblzma-devel-5.8.1-hb9d3cd8_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libnsl-2.0.1-hb9d3cd8_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libsodium-1.0.20-h4ab18f5_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libsqlite-3.50.4-h0c1763c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-15.2.0-h8f9b012_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-15.2.0-h4852527_7.conda
@@ -776,226 +793,339 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libxcrypt-4.4.36-hd590300_1.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.3.1-hb9d3cd8_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/lua-5.4.8-h03e1676_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/markdown-it-py-3.0.0-pyhd8ed1ab_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/mdurl-0.1.2-pyhd8ed1ab_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/linux-64/mypy-1.5.1-py38h01eb140_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/mypy_extensions-1.0.0-pyha770c72_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/markdown-it-py-4.0.0-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/matplotlib-inline-0.2.1-pyhd8ed1ab_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/mdurl-0.1.2-pyhd8ed1ab_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/mypy-1.5.1-py310h2372a71_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/mypy_extensions-1.1.0-pyha770c72_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.5-h2d0b736_3.conda
+      - conda: https://conda.anaconda.org/conda-forge/noarch/nest-asyncio-1.6.0-pyhd8ed1ab_1.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/openssl-3.5.4-h26f9b46_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/packaging-25.0-pyh29332c3_1.conda
-      - conda: https://conda.anaconda.org/conda-forge/noarch/pluggy-1.5.0-pyhd8ed1ab_0.conda
-      - conda: https://conda.anaconda.org/conda-forge/linux-64/psutil-6.0.0-py38hfb59056_0.conda
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+  constrains:
+  - python >=3.9,<3.11
+  license: PSF-2.0
+  license_family: PSF
+  purls:
+  - pkg:pypi/backports-asyncio-runner?source=hash-mapping
+  size: 43275
+  timestamp: 1753456387170
 - conda: https://conda.anaconda.org/conda-forge/noarch/backrefs-5.8-pyhd8ed1ab_0.conda
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   md5: b16e2595d3a9042aa9d570375978835f
@@ -1062,22 +1232,23 @@ packages:
   license_family: GPL
   size: 3715763
   timestamp: 1761335193784
-- conda: https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.1.0-py38h17151c0_1.conda
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-  md5: 7a5a699c8992fc51ef25e980f4502c2a
+- conda: https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.2.0-py310h8cfb67f_0.conda
+  sha256: ec60f83061182a5587bf0c249dbaa28426c7ddd2d16f0a91735767faf7173941
+  md5: 12f24867bc0ec4e15c89cdff988c500e
   depends:
-  - libgcc-ng >=12
-  - libstdcxx-ng >=12
-  - python >=3.8,<3.9.0a0
-  - python_abi 3.8.* *_cp38
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=14
+  - libstdcxx >=14
+  - python >=3.10,<3.11.0a0
+  - python_abi 3.10.* *_cp310
   constrains:
-  - libbrotlicommon 1.1.0 hd590300_1
+  - libbrotlicommon 1.2.0 h09219d5_0
   license: MIT
   license_family: MIT
   purls:
   - pkg:pypi/brotli?source=hash-mapping
-  size: 350830
-  timestamp: 1695990250755
+  size: 367955
+  timestamp: 1761592267690
 - conda: https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.2.0-py312h67db365_0.conda
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   md5: 7c9245551ebbe6b6068aeda04060afaa
@@ -1108,21 +1279,22 @@ packages:
   license_family: MIT
   size: 368319
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-- conda: https://conda.anaconda.org/conda-forge/osx-64/brotli-python-1.1.0-py38h940360d_1.conda
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-  md5: ad8d4ae4e8351a2fc0fe92f13bd266d8
+- conda: https://conda.anaconda.org/conda-forge/osx-64/brotli-python-1.2.0-py310h67da81d_0.conda
+  sha256: fe6b7b42e5c1f9b01addfc390c511f6379bdf32760c55afbaf9f051de8871930
+  md5: 7efadd87624c40def266764a8e14d294
   depends:
-  - libcxx >=15.0.7
-  - python >=3.8,<3.9.0a0
-  - python_abi 3.8.* *_cp38
+  - __osx >=10.13
+  - libcxx >=19
+  - python >=3.10,<3.11.0a0
+  - python_abi 3.10.* *_cp310
   constrains:
-  - libbrotlicommon 1.1.0 h0dc2134_1
+  - libbrotlicommon 1.2.0 h105ed1c_0
   license: MIT
   license_family: MIT
   purls:
   - pkg:pypi/brotli?source=hash-mapping
-  size: 366343
-  timestamp: 1695990788245
+  size: 389150
+  timestamp: 1761593458217
 - conda: https://conda.anaconda.org/conda-forge/osx-64/brotli-python-1.2.0-py312hbe43a26_0.conda
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@@ -1151,22 +1323,23 @@ packages:
   license_family: MIT
   size: 389830
   timestamp: 1761593069187
-- conda: https://conda.anaconda.org/conda-forge/osx-arm64/brotli-python-1.1.0-py38he333c0f_1.conda
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-  - libcxx >=15.0.7
-  - python >=3.8,<3.9.0a0
-  - python >=3.8,<3.9.0a0 *_cpython
-  - python_abi 3.8.* *_cp38
+- conda: https://conda.anaconda.org/conda-forge/osx-arm64/brotli-python-1.2.0-py310haaa1140_0.conda
+  sha256: b2a5680a869062bb8b4afe714b5b11a131d3a0c01919569c0c2fdb1ae21565b8
+  md5: 140410c8c38b32299441d892336bbfdd
+  depends:
+  - __osx >=11.0
+  - libcxx >=19
+  - python >=3.10,<3.11.0a0
+  - python >=3.10,<3.11.0a0 *_cpython
+  - python_abi 3.10.* *_cp310
   constrains:
-  - libbrotlicommon 1.1.0 hb547adb_1
+  - libbrotlicommon 1.2.0 h87ba0bc_0
   license: MIT
   license_family: MIT
   purls:
   - pkg:pypi/brotli?source=hash-mapping
-  size: 343036
-  timestamp: 1695990970956
+  size: 359380
+  timestamp: 1761592820004
 - conda: https://conda.anaconda.org/conda-forge/osx-arm64/brotli-python-1.2.0-py312hcae0c51_0.conda
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   md5: 17e32d91d89e91631f97c217f192483b
@@ -1197,23 +1370,23 @@ packages:
   license_family: MIT
   size: 359535
   timestamp: 1761592749203
-- conda: https://conda.anaconda.org/conda-forge/win-64/brotli-python-1.1.0-py38hd3f51b4_1.conda
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-  md5: 72708ea626a2530148ea49eb743576f4
+- conda: https://conda.anaconda.org/conda-forge/win-64/brotli-python-1.2.0-py310h8abc2a3_0.conda
+  sha256: cf035a1ed88651130c4dc76de4578c51d867f7b5bd3f41eddceb9c9440c63527
+  md5: cae22b07f9c82ec3762e8c5140e3b580
   depends:
-  - python >=3.8,<3.9.0a0
-  - python_abi 3.8.* *_cp38
+  - python >=3.10,<3.11.0a0
+  - python_abi 3.10.* *_cp310
   - ucrt >=10.0.20348.0
-  - vc >=14.2,<15
-  - vc14_runtime >=14.29.30139
+  - vc >=14.3,<15
+  - vc14_runtime >=14.44.35208
   constrains:
-  - libbrotlicommon 1.1.0 hcfcfb64_1
+  - libbrotlicommon 1.2.0 hc82b238_0
   license: MIT
   license_family: MIT
   purls:
-  - pkg:pypi/brotli?source=hash-mapping
-  size: 321650
-  timestamp: 1695990817828
+  - pkg:pypi/brotli?source=compressed-mapping
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+  timestamp: 1761593007322
 - conda: https://conda.anaconda.org/conda-forge/win-64/brotli-python-1.2.0-py312h9d5906e_0.conda
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   md5: 33b94eb79455950e69771bdd22db2988
@@ -1410,40 +1583,32 @@ packages:
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   size: 44030
   timestamp: 1735230287782
-- conda: https://conda.anaconda.org/conda-forge/noarch/certifi-2024.8.30-pyhd8ed1ab_0.conda
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-  purls:
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 - conda: https://conda.anaconda.org/conda-forge/noarch/certifi-2025.10.5-pyhd8ed1ab_0.conda
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   md5: 257ae203f1d204107ba389607d375ded
   depends:
   - python >=3.10
   license: ISC
+  purls:
+  - pkg:pypi/certifi?source=hash-mapping
   size: 160248
   timestamp: 1759648987029
-- conda: https://conda.anaconda.org/conda-forge/linux-64/cffi-1.17.0-py38heb5c249_0.conda
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-  md5: b41a6ee3a5b044185b5f46aaf6082388
+- conda: https://conda.anaconda.org/conda-forge/linux-64/cffi-2.0.0-py310he7384ee_1.conda
+  sha256: bf76ead6d59b70f3e901476a73880ac92011be63b151972d135eec55bbbe6091
+  md5: 803e2d778b8dcccdc014127ec5001681
   depends:
   - __glibc >=2.17,<3.0.a0
-  - libffi >=3.4,<4.0a0
-  - libgcc-ng >=12
+  - libffi >=3.5.2,<3.6.0a0
+  - libgcc >=14
   - pycparser
-  - python >=3.8,<3.9.0a0
-  - python_abi 3.8.* *_cp38
+  - python >=3.10,<3.11.0a0
+  - python_abi 3.10.* *_cp310
   license: MIT
   license_family: MIT
   purls:
-  - pkg:pypi/cffi?source=hash-mapping
-  size: 240463
-  timestamp: 1723018485509
+  - pkg:pypi/cffi?source=compressed-mapping
+  size: 244766
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 - conda: https://conda.anaconda.org/conda-forge/linux-64/cffi-2.0.0-py312h460c074_1.conda
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@@ -1472,21 +1637,21 @@ packages:
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   size: 300271
   timestamp: 1761203085220
-- conda: https://conda.anaconda.org/conda-forge/osx-64/cffi-1.17.0-py38hc8bcfa4_0.conda
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-  md5: d2a8f77ea8b928779611d1072e9ff89d
+- conda: https://conda.anaconda.org/conda-forge/osx-64/cffi-2.0.0-py310h062c7ae_1.conda
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+  md5: c78bd9e0015204ae349a555f957b544d
   depends:
   - __osx >=10.13
-  - libffi >=3.4,<4.0a0
+  - libffi >=3.5.2,<3.6.0a0
   - pycparser
-  - python >=3.8,<3.9.0a0
-  - python_abi 3.8.* *_cp38
+  - python >=3.10,<3.11.0a0
+  - python_abi 3.10.* *_cp310
   license: MIT
   license_family: MIT
   purls:
   - pkg:pypi/cffi?source=hash-mapping
-  size: 228572
-  timestamp: 1723018629051
+  size: 236897
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 - conda: https://conda.anaconda.org/conda-forge/osx-64/cffi-2.0.0-py312he90777b_1.conda
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   md5: cf70c8244e7ceda7e00b1881ad7697a9
@@ -1513,22 +1678,22 @@ packages:
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   timestamp: 1761203106369
-- conda: https://conda.anaconda.org/conda-forge/osx-arm64/cffi-1.17.0-py38h858044d_0.conda
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-  md5: 792d275788105bf78189bb55dc1e9c76
+- conda: https://conda.anaconda.org/conda-forge/osx-arm64/cffi-2.0.0-py310hf5b66c1_1.conda
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+  md5: 4e0516a8b6f96414d867af0228237a43
   depends:
   - __osx >=11.0
-  - libffi >=3.4,<4.0a0
+  - libffi >=3.5.2,<3.6.0a0
   - pycparser
-  - python >=3.8,<3.9.0a0
-  - python >=3.8,<3.9.0a0 *_cpython
-  - python_abi 3.8.* *_cp38
+  - python >=3.10,<3.11.0a0
+  - python >=3.10,<3.11.0a0 *_cpython
+  - python_abi 3.10.* *_cp310
   license: MIT
   license_family: MIT
   purls:
   - pkg:pypi/cffi?source=hash-mapping
-  size: 227934
-  timestamp: 1723018694952
+  size: 236349
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 - conda: https://conda.anaconda.org/conda-forge/osx-arm64/cffi-2.0.0-py312h1b4d9a2_1.conda
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@@ -1557,22 +1722,22 @@ packages:
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   size: 292983
   timestamp: 1761203354051
-- conda: https://conda.anaconda.org/conda-forge/win-64/cffi-1.17.0-py38h4cb3324_0.conda
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-  md5: da2c9ba02e759024e994d0ecce7c860b
+- conda: https://conda.anaconda.org/conda-forge/win-64/cffi-2.0.0-py310h29418f3_1.conda
+  sha256: abd04b75ee9a04a2f00dc102b4dc126f393fde58536ca4eaf1a72bb7d60dadf4
+  md5: 269ba3d69bf6569296a29425a26400df
   depends:
   - pycparser
-  - python >=3.8,<3.9.0a0
-  - python_abi 3.8.* *_cp38
+  - python >=3.10,<3.11.0a0
+  - python_abi 3.10.* *_cp310
   - ucrt >=10.0.20348.0
-  - vc >=14.2,<15
-  - vc14_runtime >=14.29.30139
+  - vc >=14.3,<15
+  - vc14_runtime >=14.44.35208
   license: MIT
   license_family: MIT
   purls:
-  - pkg:pypi/cffi?source=hash-mapping
-  size: 236272
-  timestamp: 1723018796385
+  - pkg:pypi/cffi?source=compressed-mapping
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 - conda: https://conda.anaconda.org/conda-forge/win-64/cffi-2.0.0-py312he06e257_1.conda
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   md5: 46f7dccfee37a52a97c0ed6f33fcf0a3
@@ -1601,17 +1766,6 @@ packages:
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   size: 294731
   timestamp: 1761203441365
-- conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.0-pyhd8ed1ab_0.conda
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 - conda: https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.4.4-pyhd8ed1ab_0.conda
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   md5: a22d1fd9bf98827e280a02875d9a007a
@@ -1619,33 +1773,10 @@ packages:
   - python >=3.10
   license: MIT
   license_family: MIT
+  purls:
+  - pkg:pypi/charset-normalizer?source=compressed-mapping
   size: 50965
   timestamp: 1760437331772
-- conda: https://conda.anaconda.org/conda-forge/noarch/click-8.1.7-unix_pyh707e725_0.conda
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-  license: BSD-3-Clause
-  license_family: BSD
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-  size: 84437
-  timestamp: 1692311973840
-- conda: https://conda.anaconda.org/conda-forge/noarch/click-8.1.7-win_pyh7428d3b_0.conda
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-  md5: 3549ecbceb6cd77b91a105511b7d0786
-  depends:
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-  - colorama
-  - python >=3.8
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-  purls:
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 - conda: https://conda.anaconda.org/conda-forge/noarch/click-8.3.0-pyh707e725_0.conda
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   md5: e76c4ba9e1837847679421b8d549b784
@@ -1654,6 +1785,8 @@ packages:
   - python >=3.10
   license: BSD-3-Clause
   license_family: BSD
+  purls:
+  - pkg:pypi/click?source=compressed-mapping
   size: 91622
   timestamp: 1758270534287
 - conda: https://conda.anaconda.org/conda-forge/noarch/click-8.3.0-pyh7428d3b_0.conda
@@ -1665,19 +1798,10 @@ packages:
   - python >=3.10
   license: BSD-3-Clause
   license_family: BSD
+  purls:
+  - pkg:pypi/click?source=hash-mapping
   size: 92148
   timestamp: 1758270588199
-- conda: https://conda.anaconda.org/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_0.tar.bz2
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 - conda: https://conda.anaconda.org/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_1.conda
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   md5: 962b9857ee8e7018c22f2776ffa0b2d7
@@ -1685,8 +1809,22 @@ packages:
   - python >=3.9
   license: BSD-3-Clause
   license_family: BSD
+  purls:
+  - pkg:pypi/colorama?source=hash-mapping
   size: 27011
   timestamp: 1733218222191
+- conda: https://conda.anaconda.org/conda-forge/noarch/comm-0.2.3-pyhe01879c_0.conda
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+  md5: 2da13f2b299d8e1995bafbbe9689a2f7
+  depends:
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+  - python
+  license: BSD-3-Clause
+  license_family: BSD
+  purls:
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+  size: 14690
+  timestamp: 1753453984907
 - conda: https://conda.anaconda.org/conda-forge/noarch/cssselect2-0.8.0-pyhd8ed1ab_0.conda
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@@ -1698,6 +1836,80 @@ packages:
   license_family: BSD
   size: 20425
   timestamp: 1751498485591
+- conda: https://conda.anaconda.org/conda-forge/linux-64/debugpy-1.8.17-py310h25320af_0.conda
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+  md5: df12e1e922f79a4a407bc9566e9fba3f
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+  - libstdcxx >=14
+  - libgcc >=14
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=14
+  - python_abi 3.10.* *_cp310
+  license: MIT
+  license_family: MIT
+  purls:
+  - pkg:pypi/debugpy?source=hash-mapping
+  size: 2231656
+  timestamp: 1758162044990
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-  timestamp: 1714723445995
 - conda: https://conda.anaconda.org/conda-forge/win-64/zstd-1.5.7-hbeecb71_2.conda
   sha256: bc64864377d809b904e877a98d0584f43836c9f2ef27d3d2a1421fa6eae7ca04
   md5: 21f56217d6125fb30c3c3f10c786d751
@@ -5691,5 +6287,6 @@ packages:
   - vc14_runtime >=14.29.30139
   license: BSD-3-Clause
   license_family: BSD
+  purls: []
   size: 354697
   timestamp: 1742433568506
diff --git a/py-rattler-build/pixi.toml b/py-rattler-build/pixi.toml
index 0d405a288..804063e85 100644
--- a/py-rattler-build/pixi.toml
+++ b/py-rattler-build/pixi.toml
@@ -7,7 +7,7 @@ platforms = ["win-64", "linux-64", "osx-64", "osx-arm64"]
 license = "BSD-3-Clause"
 preview = ["pixi-build"]
 # We are using the oldest supported python version as the build variant here
-build-variants = { python = ["3.8"] }
+build-variants = { python = ["3.10"] }
 
 [package.build]
 backend = { name = "pixi-build-python", version = "*" }
@@ -42,26 +42,29 @@ lint-rust = "cargo clippy --all-targets --workspace -- -D warnings"
 
 [feature.test.dependencies]
 py-rattler-build = { path = "." }
+ipykernel = "*"
 
 lua = "*"
 # Python 3.8 is the minimum supported version, so we use that for testing
-python = "3.8.*"
+python = "3.10.*"
 
 mypy = "~=1.5.1"
 
-pytest = "~=7.4.0"
-pytest-asyncio = "0.21.1.*"
-pytest-xprocess = ">=0.23.0,<0.24"
-
+pytest = ">=8.3"
+pytest-asyncio = "1.2.*"
+pytest-xprocess = "1.0.*"
+inline-snapshot = ">=0.31.0"
 # used in examples
 typer = "*"
+rich = ">=14.2.0,<15"
 
 [feature.test.pypi-dependencies]
 types-networkx = "*"
 
 [feature.test.tasks]
 check-cargo-lock = "cargo check --locked"
-test = { cmd = "pytest --doctest-modules", depends-on = ["type-check"] }
+test = { cmd = "pytest ./tests --doctest-modules", depends-on = ["type-check"] }
+# test = { cmd = "pytest ./tests -v -s", depends-on = ["type-check"] }
 type-check = { cmd = "mypy" }
 
 [feature.docs.dependencies]
diff --git a/py-rattler-build/pyproject.toml b/py-rattler-build/pyproject.toml
index 04549a110..029608d16 100644
--- a/py-rattler-build/pyproject.toml
+++ b/py-rattler-build/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "maturin"
 [project]
 name = "py-rattler-build"
 version = "0.48.0"
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 description = "The fastest way to build conda packages programatically"
 readme = "README.md"
 authors = [{ name = "Wolf Vollprecht", email = "w.vollprecht@gmail.com" }]
@@ -30,11 +30,11 @@ features = ["pyo3/extension-module"]
 
 [tool.ruff]
 line-length = 120
-target-version = "py38"
+target-version = "py310"
 
 [tool.mypy]
-python_version = "3.8"
-files = ["rattler_build", "tests", "examples"]
+python_version = "3.10"
+files = ["rattler_build", "tests"]
 strict = true
 enable_error_code = ["redundant-expr", "truthy-bool", "ignore-without-code"]
 disable_error_code = ["empty-body"]
diff --git a/py-rattler-build/rattler_build/__init__.py b/py-rattler-build/rattler_build/__init__.py
index 1c788a726..3d020ad9e 100644
--- a/py-rattler-build/rattler_build/__init__.py
+++ b/py-rattler-build/rattler_build/__init__.py
@@ -19,10 +19,22 @@
     Source,
     TestType,
     TestTypeEnum,
-    SelectorConfig,
 )
 
 from . import recipe_generation
+from . import stage0
+from . import stage1
+from . import render
+from . import tool_config
+from . import build_types
+from . import platform_types
+from . import progress
+from .variant_config import VariantConfig
+from .jinja_config import JinjaConfig
+from .tool_config import ToolConfiguration
+from .build_types import Directories, PackagingSettings
+from .platform_types import Platform, PlatformWithVirtualPackages
+from .render import RenderConfig
 
 
 from pathlib import Path
@@ -48,7 +60,21 @@
     "Source",
     "TestType",
     "TestTypeEnum",
-    "SelectorConfig",
+    "JinjaConfig",
+    "stage0",
+    "stage1",
+    "render",
+    "tool_config",
+    "build_types",
+    "platform_types",
+    "progress",
+    "VariantConfig",
+    "ToolConfiguration",
+    "Directories",
+    "PackagingSettings",
+    "Platform",
+    "PlatformWithVirtualPackages",
+    "RenderConfig",
 ]
 
 
diff --git a/py-rattler-build/rattler_build/build_types.py b/py-rattler-build/rattler_build/build_types.py
new file mode 100644
index 000000000..ca7d9b30c
--- /dev/null
+++ b/py-rattler-build/rattler_build/build_types.py
@@ -0,0 +1,14 @@
+"""
+Build-related types for rattler-build.
+
+This module provides Pythonic APIs for build directories, packaging settings, and other
+build-related configuration.
+"""
+
+from . import rattler_build as _rb
+
+# Re-export the Rust types
+Directories = _rb.build_types.Directories
+PackagingSettings = _rb.build_types.PackagingSettings
+
+__all__ = ["Directories", "PackagingSettings"]
diff --git a/py-rattler-build/rattler_build/jinja_config.py b/py-rattler-build/rattler_build/jinja_config.py
new file mode 100644
index 000000000..1e4787247
--- /dev/null
+++ b/py-rattler-build/rattler_build/jinja_config.py
@@ -0,0 +1,94 @@
+from typing import Any, Dict, Optional
+from .rattler_build import PyJinjaConfig
+
+
+class JinjaConfig:
+    """Python wrapper for PyJinjaConfig to provide a cleaner interface."""
+
+    _config: PyJinjaConfig
+
+    def __init__(
+        self,
+        target_platform: Optional[str] = None,
+        host_platform: Optional[str] = None,
+        build_platform: Optional[str] = None,
+        experimental: Optional[bool] = None,
+        allow_undefined: Optional[bool] = None,
+        variant: Optional[Dict[str, Any]] = None,
+    ):
+        self._config = PyJinjaConfig(
+            target_platform=target_platform,
+            host_platform=host_platform,
+            build_platform=build_platform,
+            experimental=experimental,
+            allow_undefined=allow_undefined,
+            variant=variant,
+        )
+
+    @property
+    def target_platform(self) -> Optional[str]:
+        """Get the target platform."""
+        return self._config.target_platform
+
+    @target_platform.setter
+    def target_platform(self, value: Optional[str]) -> None:
+        """Set the target platform."""
+        self._config.target_platform = value
+
+    @property
+    def host_platform(self) -> Optional[str]:
+        """Get the host platform."""
+        return self._config.host_platform
+
+    @host_platform.setter
+    def host_platform(self, value: Optional[str]) -> None:
+        """Set the host platform."""
+        self._config.host_platform = value
+
+    @property
+    def build_platform(self) -> Optional[str]:
+        """Get the build platform."""
+        return self._config.build_platform
+
+    @build_platform.setter
+    def build_platform(self, value: Optional[str]) -> None:
+        """Set the build platform."""
+        self._config.build_platform = value
+
+    @property
+    def experimental(self) -> Optional[bool]:
+        """Get whether experimental features are enabled."""
+        return self._config.experimental
+
+    @experimental.setter
+    def experimental(self, value: Optional[bool]) -> None:
+        """Set whether experimental features are enabled."""
+        self._config.experimental = value
+
+    @property
+    def allow_undefined(self) -> Optional[bool]:
+        """Get whether undefined variables are allowed."""
+        return self._config.allow_undefined
+
+    @allow_undefined.setter
+    def allow_undefined(self, value: Optional[bool]) -> None:
+        """Set whether undefined variables are allowed."""
+        self._config.allow_undefined = value
+
+    @property
+    def variant(self) -> Dict[str, Any]:
+        """Get the variant configuration."""
+        return self._config.variant
+
+    @variant.setter
+    def variant(self, value: Dict[str, Any]) -> None:
+        """Set the variant configuration."""
+        self._config.variant = value
+
+    @property
+    def config(self) -> PyJinjaConfig:
+        """Get the underlying PyJinjaConfig (for backward compatibility)."""
+        return self._config
+
+    def __repr__(self) -> str:
+        return f"JinjaConfig(target_platform={self.target_platform!r}, variant={self.variant!r})"
diff --git a/py-rattler-build/rattler_build/platform_types.py b/py-rattler-build/rattler_build/platform_types.py
new file mode 100644
index 000000000..1d6feea4f
--- /dev/null
+++ b/py-rattler-build/rattler_build/platform_types.py
@@ -0,0 +1,14 @@
+"""
+Platform-related types for rattler-build.
+
+This module provides Pythonic APIs for platform detection, virtual packages, and
+platform-specific configuration.
+"""
+
+from . import rattler_build as _rb
+
+# Re-export the Rust types
+Platform = _rb.platform_types.Platform
+PlatformWithVirtualPackages = _rb.platform_types.PlatformWithVirtualPackages
+
+__all__ = ["Platform", "PlatformWithVirtualPackages"]
diff --git a/py-rattler-build/rattler_build/progress.py b/py-rattler-build/rattler_build/progress.py
new file mode 100644
index 000000000..2d6680cd0
--- /dev/null
+++ b/py-rattler-build/rattler_build/progress.py
@@ -0,0 +1,461 @@
+"""
+Progress reporting and callbacks for rattler-build.
+
+This module provides base classes and implementations for progress reporting
+during recipe rendering and building. You can use the built-in implementations
+(RichProgressCallback, TqdmProgressCallback) or create your own by subclassing
+ProgressCallback.
+"""
+
+from typing import Protocol, Optional, runtime_checkable
+
+# Try to import from Rust module, but provide Python fallbacks if not available yet
+try:
+    from rattler_build.rattler_build.progress import (
+        DownloadStartEvent,
+        DownloadProgressEvent,
+        DownloadCompleteEvent,
+        BuildStepEvent,
+        LogEvent,
+    )
+except (ImportError, AttributeError):
+    # Fallback Python implementations for when Rust bindings aren't ready
+    class DownloadStartEvent:
+        """Event fired when a download starts."""
+
+        def __init__(self, url: str, total_bytes: Optional[int] = None):
+            self.url = url
+            self.total_bytes = total_bytes
+
+        def __repr__(self):
+            return f"DownloadStartEvent(url='{self.url}', total_bytes={self.total_bytes})"
+
+    class DownloadProgressEvent:
+        """Event fired during download progress."""
+
+        def __init__(self, url: str, bytes_downloaded: int, total_bytes: Optional[int] = None):
+            self.url = url
+            self.bytes_downloaded = bytes_downloaded
+            self.total_bytes = total_bytes
+
+        def __repr__(self):
+            return f"DownloadProgressEvent(url='{self.url}', bytes_downloaded={self.bytes_downloaded}, total_bytes={self.total_bytes})"
+
+    class DownloadCompleteEvent:
+        """Event fired when a download completes."""
+
+        def __init__(self, url: str):
+            self.url = url
+
+        def __repr__(self):
+            return f"DownloadCompleteEvent(url='{self.url}')"
+
+    class BuildStepEvent:
+        """Event fired when a build step begins."""
+
+        def __init__(self, step_name: str, message: str):
+            self.step_name = step_name
+            self.message = message
+
+        def __repr__(self):
+            return f"BuildStepEvent(step_name='{self.step_name}', message='{self.message}')"
+
+    class LogEvent:
+        """Event fired for log messages."""
+
+        def __init__(self, level: str, message: str, span: Optional[str] = None):
+            self.level = level
+            self.message = message
+            self.span = span
+
+        def __repr__(self):
+            return f"LogEvent(level='{self.level}', message='{self.message}', span={self.span})"
+
+
+__all__ = [
+    "ProgressCallback",
+    "DownloadStartEvent",
+    "DownloadProgressEvent",
+    "DownloadCompleteEvent",
+    "BuildStepEvent",
+    "LogEvent",
+    "SimpleProgressCallback",
+    "RichProgressCallback",
+]
+
+
+@runtime_checkable
+class ProgressCallback(Protocol):
+    """Protocol for progress callbacks.
+
+    Implement this protocol to receive progress updates during builds.
+    All methods are optional - only implement the ones you need.
+
+    Example:
+        ```python
+        class MyCallback(ProgressCallback):
+            def on_download_progress(self, event: DownloadProgressEvent):
+                percent = event.bytes_downloaded / event.total_bytes * 100
+                print(f"Downloaded {percent:.1f}%")
+
+            def on_build_step(self, event: BuildStepEvent):
+                print(f"[{event.step_name}] {event.message}")
+        ```
+    """
+
+    def on_download_start(self, event: DownloadStartEvent) -> None:
+        """Called when a download starts.
+
+        Args:
+            event: Event containing download URL and expected total bytes
+        """
+        ...
+
+    def on_download_progress(self, event: DownloadProgressEvent) -> None:
+        """Called periodically during download to report progress.
+
+        Args:
+            event: Event containing bytes downloaded and total bytes
+        """
+        ...
+
+    def on_download_complete(self, event: DownloadCompleteEvent) -> None:
+        """Called when a download completes successfully.
+
+        Args:
+            event: Event containing the download URL
+        """
+        ...
+
+    def on_build_step(self, event: BuildStepEvent) -> None:
+        """Called when a new build step begins.
+
+        Args:
+            event: Event containing step name and message
+        """
+        ...
+
+    def on_log(self, event: LogEvent) -> None:
+        """Called for log messages.
+
+        Args:
+            event: Event containing log level, message, and optional span
+        """
+        ...
+
+
+class SimpleProgressCallback:
+    """Simple console-based progress callback.
+
+    Prints progress updates to the console with simple formatting.
+
+    Example:
+        ```python
+        from rattler_build import Recipe, VariantConfig
+        from rattler_build.progress import SimpleProgressCallback
+
+        recipe = Recipe.from_file("recipe.yaml")
+        rendered = recipe.render(VariantConfig())
+
+        callback = SimpleProgressCallback()
+        # Use callback in build (to be implemented)
+        ```
+    """
+
+    def on_download_start(self, event: DownloadStartEvent) -> None:
+        """Print download start message."""
+        if event.total_bytes:
+            print(f"📥 Downloading {event.url} ({event.total_bytes / 1024 / 1024:.1f} MB)")
+        else:
+            print(f"📥 Downloading {event.url}")
+
+    def on_download_progress(self, event: DownloadProgressEvent) -> None:
+        """Print download progress (only at 25% intervals to avoid spam)."""
+        if event.total_bytes:
+            percent = (event.bytes_downloaded / event.total_bytes) * 100
+            if int(percent) % 25 == 0 and percent > 0:
+                print(f"   {percent:.0f}% complete")
+
+    def on_download_complete(self, event: DownloadCompleteEvent) -> None:
+        """Print download complete message."""
+        print(f"✅ Downloaded {event.url}")
+
+    def on_build_step(self, event: BuildStepEvent) -> None:
+        """Print build step message."""
+        print(f"🔨 [{event.step_name}] {event.message}")
+
+    def on_log(self, event: LogEvent) -> None:
+        """Print log message with appropriate prefix."""
+        prefix = {
+            "error": "❌",
+            "warn": "⚠️ ",
+            "info": "ℹ️ ",
+        }.get(event.level, "  ")
+        span_str = f" [{event.span}]" if event.span else ""
+        print(f"{prefix}{span_str} {event.message}")
+
+
+class RichProgressCallback:
+    """Rich-based progress callback with beautiful terminal output.
+
+    Automatically creates progress bars for long-running operations by parsing
+    log messages. Shows spinners for operations and bars for downloads.
+
+    Requires the 'rich' library to be installed:
+        pip install rich
+
+    Example:
+        ```python
+        from rattler_build import Recipe, VariantConfig
+        from rattler_build.progress import RichProgressCallback
+
+        recipe = Recipe.from_file("recipe.yaml")
+        rendered = recipe.render(VariantConfig())
+
+        with RichProgressCallback() as callback:
+            # Use callback in build (to be implemented)
+            pass
+        ```
+    """
+
+    def __init__(self, show_logs: bool = True, show_details: bool = False):
+        """Initialize the Rich progress callback.
+
+        Args:
+            show_logs: Whether to display all log messages (default: True - recommended for debugging)
+            show_details: Whether to show detailed logs like index operations (default: False)
+        """
+        try:
+            from rich.progress import (
+                Progress,
+                SpinnerColumn,
+                BarColumn,
+                TextColumn,
+                TimeElapsedColumn,
+            )
+            from rich.console import Console
+        except ImportError:
+            raise ImportError("Rich library is required for RichProgressCallback. " "Install it with: pip install rich")
+
+        self.show_logs = show_logs
+        self.show_details = show_details
+        self.console = Console()
+
+        # Create progress for operations
+        self.progress = Progress(
+            SpinnerColumn(),
+            TextColumn("[bold blue]{task.description}"),
+            BarColumn(complete_style="green", finished_style="bold green"),
+            TextColumn("[progress.percentage]{task.percentage:>3.0f}%"),
+            TimeElapsedColumn(),
+            console=self.console,
+        )
+
+        self.tasks = {}  # Download tasks
+        self.operation_tasks = {}  # Operation tasks (resolving, building, etc.)
+        self.current_operation = None
+
+    def __enter__(self):
+        """Context manager entry."""
+        self.progress.start()
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        """Context manager exit."""
+        self.progress.stop()
+
+    def on_download_start(self, event: DownloadStartEvent) -> None:
+        """Create a progress bar for the download."""
+        task_id = self.progress.add_task(
+            f"Downloading {self._shorten_url(event.url)}",
+            total=event.total_bytes,
+        )
+        self.tasks[event.url] = task_id
+
+    def on_download_progress(self, event: DownloadProgressEvent) -> None:
+        """Update the download progress bar."""
+        task_id = self.tasks.get(event.url)
+        if task_id is not None:
+            self.progress.update(task_id, completed=event.bytes_downloaded)
+
+    def on_download_complete(self, event: DownloadCompleteEvent) -> None:
+        """Mark the download as complete."""
+        task_id = self.tasks.get(event.url)
+        if task_id is not None:
+            self.progress.update(task_id, completed=True)
+            del self.tasks[event.url]
+
+    def on_build_step(self, event: BuildStepEvent) -> None:
+        """Update or create a build step task."""
+        if self.step_task is not None:
+            self.progress.remove_task(self.step_task)
+
+        self.step_task = self.progress.add_task(
+            f"[cyan]{event.step_name}[/cyan]: {event.message}",
+            total=None,  # Indeterminate progress
+        )
+
+    def on_log(self, event: LogEvent) -> None:
+        """Parse log messages and create/update progress bars."""
+
+        msg = event.message
+        span = event.span or ""
+
+        # Skip noisy index operations unless show_details is True
+        if not self.show_details and (
+            "index_subdir" in span or "Adding 0 packages" in msg or "Writing repodata" in msg
+        ):
+            return
+
+        # Detect operation starts and create progress indicators
+        if "Starting build of" in msg:
+            self._complete_operation()
+            self.current_operation = self.progress.add_task("🔨 Building package", total=100)
+            self.progress.update(self.current_operation, advance=10)
+
+        elif "Fetching source code" in span:
+            self._complete_operation()
+            self.current_operation = self.progress.add_task("📥 Fetching sources", total=100)
+            if "No sources" in msg:
+                self.progress.update(self.current_operation, completed=100)
+            else:
+                self.progress.update(self.current_operation, advance=50)
+
+        elif "Resolving environments" in span:
+            if self.current_operation is None or "Fetching" not in str(
+                self.progress.tasks[self.current_operation].description
+            ):
+                self._complete_operation()
+                self.current_operation = self.progress.add_task("🔍 Resolving dependencies", total=100)
+            # Advance progress as we see different stages
+            if "Platform:" in msg:
+                self.progress.update(self.current_operation, advance=20)
+            elif "Specs:" in msg:
+                self.progress.update(self.current_operation, advance=20)
+
+        elif "get_or_create_subdir" in span and "sharded repodata" in msg:
+            if self.current_operation:
+                self.progress.update(self.current_operation, advance=5)
+
+        elif "Running build for" in span:
+            # Only create the task once for the entire build script phase
+            if self.current_operation is None or "⚙️  Running build script" not in str(
+                self.progress.tasks[self.current_operation].description
+            ):
+                self._complete_operation()
+                self.current_operation = self.progress.add_task("⚙️  Running build script", total=100)
+
+            # Update progress based on environment updates
+            if "Successfully updated the build environment" in msg:
+                self.progress.update(self.current_operation, advance=50)
+            elif "Successfully updated the host environment" in msg:
+                self.progress.update(self.current_operation, completed=100)
+
+        elif "Packaging new files" in span:
+            # Only create the packaging task once, not for every log message
+            if self.current_operation is None or "📦 Packaging" not in str(
+                self.progress.tasks[self.current_operation].description
+            ):
+                self._complete_operation()
+                self.current_operation = self.progress.add_task("📦 Packaging", total=100)
+
+            # Update progress based on packaging steps
+            if "Copying done" in msg:
+                self.progress.update(self.current_operation, advance=30)
+            elif "Post-processing done" in msg:
+                self.progress.update(self.current_operation, advance=30)
+            elif "Writing test files" in msg:
+                self.progress.update(self.current_operation, advance=10)
+            elif "Writing metadata" in msg:
+                self.progress.update(self.current_operation, advance=15)
+            elif "Copying license" in msg:
+                self.progress.update(self.current_operation, advance=10)
+            elif "Copying recipe" in msg:
+                self.progress.update(self.current_operation, advance=5)
+
+        # Show important messages or warnings/errors
+        if event.level in ("error", "warn") or self.show_logs:
+            style_map = {
+                "error": "bold red",
+                "warn": "bold yellow",
+                "info": "cyan",
+            }
+            style = style_map.get(event.level, "")
+
+            # Format with span if available
+            if span and event.level == "info":
+                formatted_msg = f"[dim]│[/dim] [{style}]{span}[/{style}] {msg}"
+            elif event.level in ("error", "warn"):
+                prefix = "❌" if event.level == "error" else "⚠️"
+                formatted_msg = f"[dim]│[/dim] {prefix} [{style}]{msg}[/{style}]"
+            else:
+                formatted_msg = f"[dim]│[/dim] {msg}"
+
+            if event.level in ("error", "warn") or (self.show_logs and event.level == "info"):
+                self.console.print(formatted_msg)
+
+    def _complete_operation(self):
+        """Complete the current operation task."""
+        if self.current_operation is not None:
+            self.progress.update(self.current_operation, completed=100)
+            self.current_operation = None
+
+    @staticmethod
+    def _shorten_url(url: str, max_len: int = 50) -> str:
+        """Shorten a URL for display."""
+        if len(url) <= max_len:
+            return url
+        return url[: max_len - 3] + "..."
+
+
+# Create a simple default callback for convenience
+default_callback = SimpleProgressCallback()
+
+
+def create_callback(style: str = "simple", **kwargs) -> ProgressCallback:
+    """Create a progress callback of the specified style.
+
+    Args:
+        style: Style of callback - "simple", "rich", or "none"
+        **kwargs: Additional arguments passed to the callback constructor
+
+    Returns:
+        A progress callback instance
+
+    Example:
+        ```python
+        # Simple console output
+        callback = create_callback("simple")
+
+        # Rich terminal output
+        callback = create_callback("rich", show_logs=True)
+
+        # No output
+        callback = create_callback("none")
+        ```
+    """
+    if style == "simple":
+        return SimpleProgressCallback()
+    elif style == "rich":
+        return RichProgressCallback(**kwargs)
+    elif style == "none":
+        # Empty callback that does nothing
+        class NoOpCallback:
+            def on_download_start(self, event):
+                pass
+
+            def on_download_progress(self, event):
+                pass
+
+            def on_download_complete(self, event):
+                pass
+
+            def on_build_step(self, event):
+                pass
+
+            def on_log(self, event):
+                pass
+
+        return NoOpCallback()
+    else:
+        raise ValueError(f"Unknown callback style: {style}")
diff --git a/py-rattler-build/rattler_build/recipe.py b/py-rattler-build/rattler_build/recipe.py
index 8052bf109..62be36d27 100644
--- a/py-rattler-build/rattler_build/recipe.py
+++ b/py-rattler-build/rattler_build/recipe.py
@@ -3,7 +3,7 @@
 from enum import Enum
 from pathlib import Path
 from typing import Any, Dict, List, Optional, Union
-from .rattler_build import parse_recipe_py, PySelectorConfig
+from . import stage0
 
 
 class TestTypeEnum(Enum):
@@ -320,98 +320,6 @@ def __repr__(self) -> str:
         return f"TestType(type='{self.test_type}')"
 
 
-class SelectorConfig:
-    """Python wrapper for PySelectorConfig to provide a cleaner interface."""
-
-    _config: PySelectorConfig
-
-    def __init__(
-        self,
-        target_platform: Optional[str] = None,
-        host_platform: Optional[str] = None,
-        build_platform: Optional[str] = None,
-        experimental: Optional[bool] = None,
-        allow_undefined: Optional[bool] = None,
-        variant: Optional[Dict[str, Any]] = None,
-    ):
-        self._config = PySelectorConfig(
-            target_platform=target_platform,
-            host_platform=host_platform,
-            build_platform=build_platform,
-            experimental=experimental,
-            allow_undefined=allow_undefined,
-            variant=variant,
-        )
-
-    @property
-    def target_platform(self) -> Optional[str]:
-        """Get the target platform."""
-        return self._config.target_platform
-
-    @target_platform.setter
-    def target_platform(self, value: Optional[str]) -> None:
-        """Set the target platform."""
-        self._config.target_platform = value
-
-    @property
-    def host_platform(self) -> Optional[str]:
-        """Get the host platform."""
-        return self._config.host_platform
-
-    @host_platform.setter
-    def host_platform(self, value: Optional[str]) -> None:
-        """Set the host platform."""
-        self._config.host_platform = value
-
-    @property
-    def build_platform(self) -> Optional[str]:
-        """Get the build platform."""
-        return self._config.build_platform
-
-    @build_platform.setter
-    def build_platform(self, value: Optional[str]) -> None:
-        """Set the build platform."""
-        self._config.build_platform = value
-
-    @property
-    def experimental(self) -> Optional[bool]:
-        """Get whether experimental features are enabled."""
-        return self._config.experimental
-
-    @experimental.setter
-    def experimental(self, value: Optional[bool]) -> None:
-        """Set whether experimental features are enabled."""
-        self._config.experimental = value
-
-    @property
-    def allow_undefined(self) -> Optional[bool]:
-        """Get whether undefined variables are allowed."""
-        return self._config.allow_undefined
-
-    @allow_undefined.setter
-    def allow_undefined(self, value: Optional[bool]) -> None:
-        """Set whether undefined variables are allowed."""
-        self._config.allow_undefined = value
-
-    @property
-    def variant(self) -> Dict[str, Any]:
-        """Get the variant configuration."""
-        return self._config.variant
-
-    @variant.setter
-    def variant(self, value: Dict[str, Any]) -> None:
-        """Set the variant configuration."""
-        self._config.variant = value
-
-    def __repr__(self) -> str:
-        return f"SelectorConfig(target_platform={self.target_platform!r}, variant={self.variant!r})"
-
-    @property
-    def config(self) -> PySelectorConfig:
-        """Get the underlying PySelectorConfig object."""
-        return self._config
-
-
 class Recipe:
     """A parsed conda recipe with object-oriented access to all fields."""
 
@@ -441,16 +349,14 @@ def from_yaml(
             experimental: Enable experimental features. Defaults to False.
             allow_undefined: Allow undefined variables in Jinja templates. Defaults to False.
             variant: Variant configuration as a dictionary. Defaults to empty.
+
+        NOTE: This method now uses the stage0 API. For more control, use stage0.Recipe.from_yaml() directly.
         """
-        selector_config = SelectorConfig(
-            target_platform=target_platform,
-            host_platform=host_platform,
-            build_platform=build_platform,
-            experimental=experimental,
-            allow_undefined=allow_undefined,
-            variant=variant,
-        )
-        data = parse_recipe_py(yaml_content, selector_config.config)
+        # Parse using the new stage0 API
+        stage0_recipe = stage0.Recipe.from_yaml(yaml_content)
+
+        # Convert to dictionary for the legacy API
+        data = stage0_recipe.to_dict()
         return cls(data)
 
     @classmethod
diff --git a/py-rattler-build/rattler_build/render.py b/py-rattler-build/rattler_build/render.py
new file mode 100644
index 000000000..617aa5ee5
--- /dev/null
+++ b/py-rattler-build/rattler_build/render.py
@@ -0,0 +1,560 @@
+"""
+Recipe rendering functionality for converting Stage0 to Stage1 recipes with variants.
+
+This module provides the ability to render Stage0 recipes (parsed but unevaluated)
+into Stage1 recipes (fully evaluated and ready to build) using variant configurations.
+"""
+
+from pathlib import Path
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
+
+from rattler_build.stage0 import MultiOutputRecipe, SingleOutputRecipe
+
+# Import for type hints only - avoid circular import
+if TYPE_CHECKING:
+    from rattler_build.tool_config import ToolConfiguration
+
+# Type for context values - can be strings, numbers, bools, or lists
+ContextValue = Union[str, int, float, bool, List[Union[str, int, float, bool]]]
+
+# Try to import TypeAlias for better type hint support
+try:
+    from typing import TypeAlias
+except ImportError:
+    from typing_extensions import TypeAlias
+
+if TYPE_CHECKING:
+    from rattler_build.variant_config import VariantConfig
+
+    # For type checking, use Any placeholders
+    _RenderConfig = Any
+    _RenderedVariant = Any
+    _HashInfo = Any
+    _PinSubpackageInfo = Any
+    _render_recipe = Any
+else:
+    # At runtime, import from the Rust module
+    from . import rattler_build as _rb
+
+    _render = _rb.render
+    _RenderConfig = _render.RenderConfig
+    _RenderedVariant = _render.RenderedVariant
+    _HashInfo = _render.HashInfo
+    _PinSubpackageInfo = _render.PinSubpackageInfo
+    _render_recipe = _render.render_recipe
+
+
+class HashInfo:
+    """
+    Hash information for a rendered variant.
+
+    This class wraps the Rust HashInfo type and provides convenient access
+    to hash information computed during recipe rendering.
+
+    Attributes:
+        hash: The hash string (first 7 letters of the sha1sum)
+        prefix: The hash prefix (e.g., 'py38' or 'np111')
+
+    Example:
+        >>> hash_info = variant.hash_info()
+        >>> if hash_info:
+        ...     print(f"Hash: {hash_info.hash}")
+        ...     print(f"Prefix: {hash_info.prefix}")
+    """
+
+    def __init__(self, inner: _HashInfo):
+        """Create a HashInfo from the Rust object."""
+        self._inner = inner
+
+    @property
+    def hash(self) -> str:
+        """Get the hash string (first 7 letters of sha1sum)."""
+        return self._inner.hash
+
+    @property
+    def prefix(self) -> str:
+        """Get the hash prefix (e.g., 'py38' or 'np111')."""
+        return self._inner.prefix
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+    def __str__(self) -> str:
+        return f"HashInfo(hash={self.hash!r}, prefix={self.prefix!r})"
+
+
+class PinSubpackageInfo:
+    """
+    Information about a pin_subpackage dependency.
+
+    This class wraps the Rust PinSubpackageInfo type and provides information
+    about packages pinned via the pin_subpackage() Jinja function.
+
+    Attributes:
+        name: The name of the pinned subpackage
+        version: The version of the pinned subpackage
+        build_string: The build string of the pinned subpackage (if known)
+        exact: Whether this is an exact pin
+
+    Example:
+        >>> pins = variant.pin_subpackages()
+        >>> for name, info in pins.items():
+        ...     print(f"{name}: {info.version} (exact={info.exact})")
+    """
+
+    def __init__(self, inner: _PinSubpackageInfo):
+        """Create a PinSubpackageInfo from the Rust object."""
+        self._inner = inner
+
+    @property
+    def name(self) -> str:
+        """Get the package name."""
+        return self._inner.name
+
+    @property
+    def version(self) -> str:
+        """Get the package version."""
+        return self._inner.version
+
+    @property
+    def build_string(self) -> Optional[str]:
+        """Get the build string if available."""
+        return self._inner.build_string
+
+    @property
+    def exact(self) -> bool:
+        """Check if this is an exact pin."""
+        return self._inner.exact
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+    def __str__(self) -> str:
+        return (
+            f"PinSubpackageInfo(name={self.name!r}, version={self.version!r}, "
+            f"build_string={self.build_string!r}, exact={self.exact})"
+        )
+
+
+class RenderConfig:
+    """Configuration for rendering recipes with variants.
+
+    This class configures how recipes are rendered, including platform settings,
+    experimental features, and additional Jinja context variables.
+
+    Args:
+        target_platform: Target platform (e.g., "linux-64", "osx-arm64")
+        build_platform: Build platform (where the build runs)
+        host_platform: Host platform (for cross-compilation)
+        experimental: Enable experimental features
+        recipe_path: Path to the recipe file (for relative path resolution)
+
+    Example:
+        >>> config = RenderConfig(
+        ...     target_platform="linux-64",
+        ...     experimental=True
+        ... )
+        >>> config.set_context("custom_var", "value")
+    """
+
+    def __init__(
+        self,
+        target_platform: Optional[str] = None,
+        build_platform: Optional[str] = None,
+        host_platform: Optional[str] = None,
+        experimental: bool = False,
+        recipe_path: Optional[str] = None,
+    ):
+        """Create a new render configuration."""
+        self._config = _RenderConfig(
+            target_platform=target_platform,
+            build_platform=build_platform,
+            host_platform=host_platform,
+            experimental=experimental,
+            recipe_path=recipe_path,
+        )
+
+    def set_context(self, key: str, value: ContextValue) -> None:
+        """Add an extra context variable for Jinja rendering.
+
+        Args:
+            key: Variable name
+            value: Variable value (can be string, bool, int, float, or list)
+        """
+        self._config.set_context(key, value)
+
+    def get_context(self, key: str) -> Optional[ContextValue]:
+        """Get an extra context variable.
+
+        Args:
+            key: Variable name
+
+        Returns:
+            The variable value, or None if not found
+        """
+        return self._config.get_context(key)
+
+    def get_all_context(self) -> Dict[str, ContextValue]:
+        """Get all extra context variables as a dictionary."""
+        return self._config.get_all_context()
+
+    @property
+    def target_platform(self) -> str:
+        """Get the target platform."""
+        return self._config.target_platform()
+
+    @target_platform.setter
+    def target_platform(self, value: str) -> None:
+        """Set the target platform."""
+        self._config.set_target_platform(value)
+
+    @property
+    def build_platform(self) -> str:
+        """Get the build platform."""
+        return self._config.build_platform()
+
+    @build_platform.setter
+    def build_platform(self, value: str) -> None:
+        """Set the build platform."""
+        self._config.set_build_platform(value)
+
+    @property
+    def host_platform(self) -> str:
+        """Get the host platform."""
+        return self._config.host_platform()
+
+    @host_platform.setter
+    def host_platform(self, value: str) -> None:
+        """Set the host platform."""
+        self._config.set_host_platform(value)
+
+    @property
+    def experimental(self) -> bool:
+        """Get whether experimental features are enabled."""
+        return self._config.experimental()
+
+    @experimental.setter
+    def experimental(self, value: bool) -> None:
+        """Set whether experimental features are enabled."""
+        self._config.set_experimental(value)
+
+    @property
+    def recipe_path(self) -> Optional[str]:
+        """Get the recipe path."""
+        return self._config.recipe_path()
+
+    @recipe_path.setter
+    def recipe_path(self, value: Optional[str]) -> None:
+        """Set the recipe path."""
+        self._config.set_recipe_path(value)
+
+    def __repr__(self) -> str:
+        return repr(self._config)
+
+
+class RenderedVariant:
+    """Result of rendering a recipe with a specific variant combination.
+
+    Each RenderedVariant represents one specific variant of a recipe after
+    all Jinja templates have been evaluated and variant values applied.
+
+    Attributes:
+        variant: The variant combination used (variable name -> value)
+        recipe: The rendered Stage1 recipe
+        hash_info: Build string hash information
+        pin_subpackages: Pin subpackage dependencies
+
+    Example:
+        >>> for variant in rendered_variants:
+        ...     print(f"Package: {variant.recipe().package().name()}")
+        ...     print(f"Variant: {variant.variant()}")
+        ...     print(f"Build string: {variant.recipe().build().string()}")
+    """
+
+    def __init__(self, inner: _RenderedVariant):
+        """Create a RenderedVariant from the Rust object."""
+        self._inner = inner
+
+    def variant(self) -> Dict[str, str]:
+        """Get the variant combination used for this render.
+
+        Returns:
+            Dictionary mapping variable names to their values
+        """
+        return self._inner.variant()
+
+    def recipe(self) -> Any:  # Returns Stage1Recipe
+        """Get the rendered Stage1 recipe.
+
+        Returns:
+            The fully evaluated Stage1 recipe ready for building
+        """
+        return self._inner.recipe()
+
+    def hash_info(self) -> Optional[HashInfo]:
+        """Get hash info if available.
+
+        Returns:
+            HashInfo object with 'hash' and 'prefix' attributes, or None
+
+        Example:
+            >>> rendered = render_recipe(recipe, variant_config)[0]
+            >>> hash_info = rendered.hash_info()
+            >>> if hash_info:
+            ...     print(f"Hash: {hash_info.hash}")
+            ...     print(f"Prefix: {hash_info.prefix}")
+        """
+        inner = self._inner.hash_info()
+        return HashInfo(inner) if inner else None
+
+    def pin_subpackages(self) -> Dict[str, PinSubpackageInfo]:
+        """Get pin_subpackage information.
+
+        Returns:
+            Dictionary mapping package names to PinSubpackageInfo objects
+
+        Example:
+            >>> rendered = render_recipe(recipe, variant_config)[0]
+            >>> for name, info in rendered.pin_subpackages().items():
+            ...     print(f"{name}: version={info.version}, exact={info.exact}")
+        """
+        inner_dict = self._inner.pin_subpackages()
+        return {name: PinSubpackageInfo(info) for name, info in inner_dict.items()}
+
+    def run_build(
+        self,
+        tool_config: Optional["ToolConfiguration"] = None,
+        output_dir: Optional[Union[str, Path]] = None,
+        channel: Optional[List[str]] = None,
+        progress_callback: Optional[Any] = None,
+        recipe_path: Optional[Union[str, Path]] = None,
+        **kwargs: Any,
+    ) -> None:
+        """Build this rendered variant.
+
+        This method builds a single rendered variant directly without needing
+        to go back through the Stage0 recipe.
+
+        Args:
+            tool_config: Optional ToolConfiguration to use for the build.
+            output_dir: Directory to store the built package. Defaults to current directory.
+            channel: List of channels to use for resolving dependencies.
+            progress_callback: Optional progress callback for build events (e.g., RichProgressCallback or SimpleProgressCallback).
+            recipe_path: Path to the recipe file (for copying license files, etc.). Defaults to None.
+            **kwargs: Additional arguments passed to build (e.g., keep_build, test, etc.)
+
+        Example:
+            >>> from rattler_build.stage0 import Recipe
+            >>> from rattler_build.variant_config import VariantConfig
+            >>> from rattler_build.render import render_recipe
+            >>>
+            >>> recipe = Recipe.from_yaml(yaml_string)
+            >>> rendered = render_recipe(recipe, VariantConfig())
+            >>> # Build just the first variant
+            >>> rendered[0].run_build(output_dir="./output")
+        """
+        from . import rattler_build as _rb
+
+        # Extract the inner ToolConfiguration if provided
+        tool_config_inner = tool_config._inner if tool_config else None
+
+        # Build this single variant
+        _rb.build_from_rendered_variants_py(
+            rendered_variants=[self._inner],
+            tool_config=tool_config_inner,
+            output_dir=Path(output_dir) if output_dir else None,
+            channel=channel,
+            progress_callback=progress_callback,
+            recipe_path=Path(recipe_path) if recipe_path else None,
+            **kwargs,
+        )
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+
+RecipeInput: TypeAlias = Union[str, SingleOutputRecipe, MultiOutputRecipe, Path]
+
+
+def render_recipe(
+    recipe: Union[RecipeInput, List[RecipeInput]],
+    variant_config: Union["VariantConfig", Path, str],
+    render_config: Optional[RenderConfig] = None,
+) -> List[RenderedVariant]:
+    """Render a Stage0 recipe with a variant configuration into Stage1 recipes.
+
+    This function takes a parsed Stage0 recipe and evaluates all Jinja templates
+    with different variant combinations to produce ready-to-build Stage1 recipes.
+
+    Args:
+        recipe: The Stage0 recipe to render (from stage0.Recipe.from_yaml())
+        variant_config: The variant configuration (from variant_config.VariantConfig)
+        render_config: Optional render configuration (defaults to current platform)
+
+    Returns:
+        List of RenderedVariant objects, one for each variant combination
+
+    Example:
+        >>> from rattler_build.stage0 import Recipe
+        >>> from rattler_build.variant_config import VariantConfig
+        >>> from rattler_build.render import render_recipe, RenderConfig
+        >>>
+        >>> # Parse stage0 recipe
+        >>> recipe = Recipe.from_yaml('''
+        ... package:
+        ...   name: my-package
+        ...   version: 1.0.0
+        ... requirements:
+        ...   host:
+        ...     - python ${{ python }}
+        ... ''')
+        >>>
+        >>> # Create variant config
+        >>> variant_config = VariantConfig.from_yaml('''
+        ... python:
+        ...   - "3.9"
+        ...   - "3.10"
+        ...   - "3.11"
+        ... ''')
+        >>>
+        >>> # Render with all variants
+        >>> rendered = render_recipe(recipe, variant_config)
+        >>> print(f"Generated {len(rendered)} variants")
+        Generated 3 variants
+    """
+    from rattler_build.stage0 import Recipe
+    from rattler_build.variant_config import VariantConfig as VC
+
+    # Handle render_config parameter
+    config_inner = render_config._config if render_config else None
+
+    # Handle recipe parameter - convert str/Path to Recipe objects
+    recipes_to_render: List[Union[SingleOutputRecipe, MultiOutputRecipe]] = []
+
+    if isinstance(recipe, list):
+        # Handle list of recipes
+        for r in recipe:
+            if isinstance(r, (str, Path)):
+                parsed = Recipe.from_file(r)
+                recipes_to_render.append(parsed)
+            elif isinstance(r, (SingleOutputRecipe, MultiOutputRecipe)):
+                recipes_to_render.append(r)
+            else:
+                raise TypeError(f"Unsupported recipe type in list: {type(r)}")
+    elif isinstance(recipe, (str, Path)):
+        # Parse single recipe from file/string
+        if isinstance(recipe, Path):
+            # Definitely a file path
+            parsed = Recipe.from_file(recipe)
+        elif recipe.endswith(".yaml") or recipe.endswith(".yml") or "/" in recipe or "\\" in recipe:
+            # String that looks like a file path
+            parsed = Recipe.from_file(recipe)
+        else:
+            # Treat as YAML string
+            parsed = Recipe.from_yaml(recipe)
+        recipes_to_render.append(parsed)
+    elif isinstance(recipe, (SingleOutputRecipe, MultiOutputRecipe)):
+        recipes_to_render.append(recipe)
+    else:
+        raise TypeError(f"Unsupported recipe type: {type(recipe)}")
+
+    # Handle variant_config parameter - convert str/Path to VariantConfig
+    if isinstance(variant_config, (str, Path)):
+        if isinstance(variant_config, Path):
+            variant_config = VC.from_file(variant_config)
+        else:
+            # Check if it's a file path or YAML string
+            if (
+                variant_config.endswith(".yaml")
+                or variant_config.endswith(".yml")
+                or "/" in variant_config
+                or "\\" in variant_config
+            ):
+                variant_config = VC.from_file(variant_config)
+            else:
+                variant_config = VC.from_yaml(variant_config)
+    elif not isinstance(variant_config, VC):
+        raise TypeError(f"Unsupported variant_config type: {type(variant_config)}")
+
+    # Now unwrap to get inner Rust objects
+    variant_config_inner = variant_config._inner
+
+    # Render all recipes and collect results
+    all_rendered: List[RenderedVariant] = []
+    for recipe_obj in recipes_to_render:
+        recipe_inner = recipe_obj._wrapper
+        rendered = _render_recipe(recipe_inner, variant_config_inner, config_inner)
+        all_rendered.extend([RenderedVariant(r) for r in rendered])
+
+    return all_rendered
+
+
+def build_rendered_variants(
+    rendered_variants: List[RenderedVariant],
+    tool_config: Optional["ToolConfiguration"] = None,
+    output_dir: Optional[Union[str, Path]] = None,
+    channel: Optional[List[str]] = None,
+    progress_callback: Optional[Any] = None,
+    recipe_path: Optional[Union[str, Path]] = None,
+    **kwargs: Any,
+) -> None:
+    """Build multiple rendered variants.
+
+    This is a convenience function for building multiple rendered variants
+    in one call, useful when you want to build all variants from a recipe.
+
+    Args:
+        rendered_variants: List of RenderedVariant objects to build
+        tool_config: Optional ToolConfiguration to use for the build.
+        output_dir: Directory to store the built packages. Defaults to current directory.
+        channel: List of channels to use for resolving dependencies.
+        progress_callback: Optional progress callback for build events (e.g., RichProgressCallback or SimpleProgressCallback).
+        recipe_path: Path to the recipe file (for copying license files, etc.). Defaults to None.
+        **kwargs: Additional arguments passed to build (e.g., keep_build, test, etc.)
+
+    Example:
+        >>> from rattler_build.stage0 import Recipe
+        >>> from rattler_build.variant_config import VariantConfig
+        >>> from rattler_build.render import render_recipe, build_rendered_variants
+        >>>
+        >>> # Parse and render recipe
+        >>> recipe = Recipe.from_yaml(yaml_string)
+        >>> variant_config = VariantConfig.from_yaml('''
+        ... python:
+        ...   - "3.9"
+        ...   - "3.10"
+        ...   - "3.11"
+        ... ''')
+        >>> rendered = render_recipe(recipe, variant_config)
+        >>>
+        >>> # Build all variants at once
+        >>> build_rendered_variants(rendered, output_dir="./output")
+        >>>
+        >>> # Or build a subset
+        >>> build_rendered_variants(rendered[:2], output_dir="./output")
+    """
+    from . import rattler_build as _rb
+
+    # Extract the inner ToolConfiguration if provided
+    tool_config_inner = tool_config._inner if tool_config else None
+
+    # Build all variants
+    _rb.build_from_rendered_variants_py(
+        rendered_variants=[v._inner for v in rendered_variants],
+        tool_config=tool_config_inner,
+        output_dir=Path(output_dir) if output_dir else None,
+        channel=channel,
+        progress_callback=progress_callback,
+        recipe_path=Path(recipe_path) if recipe_path else None,
+        **kwargs,
+    )
+
+
+__all__ = [
+    "RenderConfig",
+    "RenderedVariant",
+    "HashInfo",
+    "PinSubpackageInfo",
+    "render_recipe",
+    "build_rendered_variants",
+]
diff --git a/py-rattler-build/rattler_build/stage0.py b/py-rattler-build/rattler_build/stage0.py
new file mode 100644
index 000000000..18235bfcb
--- /dev/null
+++ b/py-rattler-build/rattler_build/stage0.py
@@ -0,0 +1,587 @@
+"""
+Stage0 - Parsed recipe types before evaluation.
+
+This module provides Python bindings for rattler-build's stage0 types,
+which represent the parsed YAML recipe before Jinja template evaluation
+and conditional resolution.
+"""
+
+from pathlib import Path
+from typing import Any, Dict, List, Optional, Union, TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from rattler_build.tool_config import ToolConfiguration
+
+    # For type checking, use Any as placeholder since we don't have stubs
+    _Stage0Recipe = Any
+    _SingleOutputRecipe = Any
+    _MultiOutputRecipe = Any
+    _Stage0Package = Any
+    _Stage0PackageMetadata = Any
+    _Stage0RecipeMetadata = Any
+    _Stage0Build = Any
+    _Stage0Requirements = Any
+    _Stage0About = Any
+    _Stage0PackageOutput = Any
+    _Stage0StagingOutput = Any
+else:
+    # At runtime, import the Rust submodule
+    from . import rattler_build as _rb
+
+    # Get the stage0 submodule
+    _stage0 = _rb.stage0
+
+    # Import classes from the stage0 submodule
+    _Stage0Recipe = _stage0.Stage0Recipe
+    _SingleOutputRecipe = _stage0.SingleOutputRecipe
+    _MultiOutputRecipe = _stage0.MultiOutputRecipe
+    _Stage0Package = _stage0.Stage0Package
+    _Stage0PackageMetadata = _stage0.Stage0PackageMetadata
+    _Stage0RecipeMetadata = _stage0.Stage0RecipeMetadata
+    _Stage0Build = _stage0.Stage0Build
+    _Stage0Requirements = _stage0.Stage0Requirements
+    _Stage0About = _stage0.Stage0About
+    _Stage0PackageOutput = _stage0.Stage0PackageOutput
+    _Stage0StagingOutput = _stage0.Stage0StagingOutput
+
+__all__ = [
+    "Recipe",
+    "SingleOutputRecipe",
+    "MultiOutputRecipe",
+    "Package",
+    "RecipeMetadata",
+    "Build",
+    "Requirements",
+    "About",
+    "PackageOutput",
+    "StagingOutput",
+]
+
+
+class Recipe:
+    """
+    A parsed conda recipe (stage0).
+
+    This can be either a single-output or multi-output recipe.
+
+    Example:
+        >>> recipe = Recipe.from_yaml(yaml_string)
+        >>> if recipe.is_single_output():
+        ...     single = recipe.as_single_output()
+        ...     print(single.package.name)
+    """
+
+    def __init__(self, inner: _Stage0Recipe):
+        self._inner = inner
+
+    @classmethod
+    def from_yaml(cls, yaml: str) -> Union["SingleOutputRecipe", "MultiOutputRecipe"]:
+        """
+        Parse a recipe from YAML string.
+
+        Returns the appropriate type: SingleOutputRecipe or MultiOutputRecipe.
+        """
+        wrapper = _Stage0Recipe.from_yaml(yaml)
+        if wrapper.is_single_output():
+            single_inner = wrapper.as_single_output()
+            return SingleOutputRecipe(single_inner, wrapper)
+        else:
+            multi_inner = wrapper.as_multi_output()
+            return MultiOutputRecipe(multi_inner, wrapper)
+
+    @classmethod
+    def from_file(cls, path: Union[str, Path]) -> Union["SingleOutputRecipe", "MultiOutputRecipe"]:
+        """
+        Parse a recipe from a YAML file.
+
+        Returns the appropriate type: SingleOutputRecipe or MultiOutputRecipe.
+        """
+        with open(path, "r", encoding="utf-8") as f:
+            return cls.from_yaml(f.read())
+
+    @classmethod
+    def from_dict(cls, recipe_dict: Dict[str, Any]) -> Union["SingleOutputRecipe", "MultiOutputRecipe"]:
+        """
+        Create a recipe from a Python dictionary.
+
+        This method validates the dictionary structure and provides detailed error
+        messages if the structure is invalid or types don't match.
+
+        Args:
+            recipe_dict: Dictionary containing recipe data (must match recipe schema)
+
+        Returns:
+            SingleOutputRecipe or MultiOutputRecipe depending on the recipe type
+
+        Raises:
+            PyRecipeParseError: If the dictionary structure is invalid or types don't match
+
+        Example:
+            >>> recipe_dict = {
+            ...     "package": {
+            ...         "name": "my-package",
+            ...         "version": "1.0.0"
+            ...     },
+            ...     "build": {
+            ...         "number": 0
+            ...     }
+            ... }
+            >>> recipe = Recipe.from_dict(recipe_dict)
+        """
+        wrapper = _Stage0Recipe.from_dict(recipe_dict)
+        if wrapper.is_single_output():
+            single_inner = wrapper.as_single_output()
+            return SingleOutputRecipe(single_inner, wrapper)
+        else:
+            multi_inner = wrapper.as_multi_output()
+            return MultiOutputRecipe(multi_inner, wrapper)
+
+    def is_single_output(self) -> bool:
+        """Check if this is a single output recipe."""
+        return self._inner.is_single_output()
+
+    def is_multi_output(self) -> bool:
+        """Check if this is a multi output recipe."""
+        return self._inner.is_multi_output()
+
+    def as_single_output(self) -> Optional["SingleOutputRecipe"]:
+        """Get as a single output recipe (None if multi-output)."""
+        inner = self._inner.as_single_output()
+        return SingleOutputRecipe(inner) if inner else None
+
+    def as_multi_output(self) -> Optional["MultiOutputRecipe"]:
+        """Get as a multi output recipe (None if single-output)."""
+        inner = self._inner.as_multi_output()
+        return MultiOutputRecipe(inner) if inner else None
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+
+class SingleOutputRecipe:
+    """A single-output recipe at stage0 (parsed, not yet evaluated)."""
+
+    def __init__(self, inner: _SingleOutputRecipe, wrapper: Any = None):
+        self._inner = inner
+        # Keep reference to the original Rust Stage0Recipe wrapper for render()
+        self._wrapper = wrapper
+
+    @property
+    def schema_version(self) -> int:
+        """Get the schema version."""
+        return self._inner.schema_version
+
+    @property
+    def context(self) -> Dict[str, Any]:
+        """Get the context variables as a dictionary."""
+        return self._inner.context
+
+    @property
+    def package(self) -> "Package":
+        """Get the package metadata."""
+        return Package(self._inner.package)
+
+    @property
+    def build(self) -> "Build":
+        """Get the build configuration."""
+        return Build(self._inner.build)
+
+    @property
+    def requirements(self) -> "Requirements":
+        """Get the requirements."""
+        return Requirements(self._inner.requirements)
+
+    @property
+    def about(self) -> "About":
+        """Get the about metadata."""
+        return About(self._inner.about)
+
+    def render(self, variant_config: Any = None, render_config: Any = None) -> List[Any]:
+        """
+        Render this recipe with variant configuration.
+
+        This is a convenience method that calls render.render_recipe() internally.
+        Always returns a list of RenderedVariant objects.
+
+        Args:
+            variant_config: Optional VariantConfig to use. If None, creates an empty config.
+            render_config: Optional RenderConfig to use. If None, uses default config.
+
+        Returns:
+            List of RenderedVariant objects (one for each variant combination)
+
+        Example:
+            >>> recipe = Recipe.from_yaml(yaml_string)
+            >>> variants = recipe.render(variant_config)
+            >>> for variant in variants:
+            ...     print(variant.recipe().package.name)
+        """
+        # Import here to avoid circular dependency
+        from . import render as render_module
+        from . import variant_config as vc_module
+
+        # Create empty variant config if not provided
+        if variant_config is None:
+            variant_config = vc_module.VariantConfig()
+
+        # Pass self (the Python wrapper) to render_recipe, not the raw Rust object
+        return render_module.render_recipe(self, variant_config, render_config)
+
+    def run_build(
+        self,
+        variant_config: Any = None,
+        tool_config: Optional["ToolConfiguration"] = None,
+        output_dir: Union[str, Path, None] = None,
+        channel: Optional[List[str]] = None,
+        **kwargs: Any,
+    ) -> None:
+        """
+        Build this recipe.
+
+        This method renders the recipe with variants and then builds the rendered outputs
+        directly without writing temporary files.
+
+        Args:
+            variant_config: Optional VariantConfig to use for building variants.
+            tool_config: Optional ToolConfiguration to use for the build. If provided, individual
+                        parameters like keep_build, test, etc. will be ignored.
+            output_dir: Directory to store the built packages. Defaults to current directory.
+            channel: List of channels to use for resolving dependencies.
+            **kwargs: Additional arguments passed to build (e.g., keep_build, test, etc.)
+                     These are ignored if tool_config is provided.
+
+        Example:
+            >>> recipe = Recipe.from_yaml(yaml_string)
+            >>> recipe.run_build(output_dir="./output")
+
+            >>> # Or with custom tool configuration
+            >>> from rattler_build import ToolConfiguration
+            >>> config = ToolConfiguration(keep_build=True, test_strategy="native")
+            >>> recipe.run_build(tool_config=config, output_dir="./output")
+        """
+        from . import rattler_build as _rb
+
+        # Render the recipe to get Stage1 variants
+        rendered_variants = self.render(variant_config)
+
+        # Extract the inner ToolConfiguration if provided
+        tool_config_inner = tool_config._inner if tool_config else None
+
+        # Build from the rendered variants
+        _rb.build_from_rendered_variants_py(
+            rendered_variants=[v._inner for v in rendered_variants],
+            tool_config=tool_config_inner,
+            output_dir=Path(output_dir) if output_dir else None,
+            channel=channel,
+            **kwargs,
+        )
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+
+class MultiOutputRecipe:
+    """A multi-output recipe at stage0 (parsed, not yet evaluated)."""
+
+    def __init__(self, inner: _MultiOutputRecipe, wrapper: Any = None):
+        self._inner = inner
+        # Keep reference to the original Rust Stage0Recipe wrapper for render()
+        self._wrapper = wrapper
+
+    @property
+    def schema_version(self) -> int:
+        """Get the schema version."""
+        return self._inner.schema_version
+
+    @property
+    def context(self) -> Dict[str, Any]:
+        """Get the context variables as a dictionary."""
+        return self._inner.context
+
+    @property
+    def recipe(self) -> "RecipeMetadata":
+        """Get the top-level recipe metadata."""
+        return RecipeMetadata(self._inner.recipe)
+
+    @property
+    def build(self) -> "Build":
+        """Get the top-level build configuration."""
+        return Build(self._inner.build)
+
+    @property
+    def about(self) -> "About":
+        """Get the top-level about metadata."""
+        return About(self._inner.about)
+
+    @property
+    def outputs(self) -> List[Union["PackageOutput", "StagingOutput"]]:
+        """Get all outputs (package and staging)."""
+        result: List[Union["PackageOutput", "StagingOutput"]] = []
+        for output in self._inner.outputs:
+            if isinstance(output, _Stage0PackageOutput):  # type: ignore[misc]
+                result.append(PackageOutput(output))
+            elif isinstance(output, _Stage0StagingOutput):  # type: ignore[misc]
+                result.append(StagingOutput(output))
+        return result
+
+    def render(self, variant_config: Any = None, render_config: Any = None) -> List[Any]:
+        """
+        Render this recipe with variant configuration.
+
+        This is a convenience method that calls render.render_recipe() internally.
+        Always returns a list of RenderedVariant objects.
+
+        Args:
+            variant_config: Optional VariantConfig to use. If None, creates an empty config.
+            render_config: Optional RenderConfig to use. If None, uses default config.
+
+        Returns:
+            List of RenderedVariant objects (one for each variant combination and output)
+
+        Example:
+            >>> recipe = Recipe.from_yaml(yaml_string)
+            >>> variants = recipe.render(variant_config)
+            >>> for variant in variants:
+            ...     print(variant.recipe().package.name)
+        """
+        # Import here to avoid circular dependency
+        from . import render as render_module
+        from . import variant_config as vc_module
+
+        # Create empty variant config if not provided
+        if variant_config is None:
+            variant_config = vc_module.VariantConfig()
+
+        # Pass self (the Python wrapper) to render_recipe, not the raw Rust object
+        return render_module.render_recipe(self, variant_config, render_config)
+
+    def run_build(
+        self,
+        variant_config: Any = None,
+        tool_config: Optional["ToolConfiguration"] = None,
+        output_dir: Union[str, Path, None] = None,
+        channel: Optional[List[str]] = None,
+        **kwargs: Any,
+    ) -> None:
+        """
+        Build this multi-output recipe.
+
+        This method renders the recipe with variants and then builds the rendered outputs
+        directly without writing temporary files.
+
+        Args:
+            variant_config: Optional VariantConfig to use for building variants.
+            tool_config: Optional ToolConfiguration to use for the build. If provided, individual
+                        parameters like keep_build, test, etc. will be ignored.
+            output_dir: Directory to store the built packages. Defaults to current directory.
+            channel: List of channels to use for resolving dependencies.
+            **kwargs: Additional arguments passed to build (e.g., keep_build, test, etc.)
+                     These are ignored if tool_config is provided.
+
+        Example:
+            >>> recipe = Recipe.from_yaml(yaml_string)
+            >>> recipe.run_build(output_dir="./output")
+
+            >>> # Or with custom tool configuration
+            >>> from rattler_build import ToolConfiguration
+            >>> config = ToolConfiguration(keep_build=True, test_strategy="native")
+            >>> recipe.run_build(tool_config=config, output_dir="./output")
+        """
+        from . import rattler_build as _rb
+
+        # Render the recipe to get Stage1 variants
+        rendered_variants = self.render(variant_config)
+
+        # Extract the inner ToolConfiguration if provided
+        tool_config_inner = tool_config._inner if tool_config else None
+
+        # Build from the rendered variants
+        _rb.build_from_rendered_variants_py(
+            rendered_variants=[v._inner for v in rendered_variants],
+            tool_config=tool_config_inner,
+            output_dir=Path(output_dir) if output_dir else None,
+            channel=channel,
+            **kwargs,
+        )
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+
+class Package:
+    """Package metadata at stage0."""
+
+    def __init__(self, inner: _Stage0Package):
+        self._inner = inner
+
+    @property
+    def name(self) -> Any:
+        """Get the package name (may be a template string like '${{ name }}')."""
+        return self._inner.name
+
+    @property
+    def version(self) -> Any:
+        """Get the package version (may be a template string like '${{ version }}')."""
+        return self._inner.version
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+
+class RecipeMetadata:
+    """Recipe metadata for multi-output recipes."""
+
+    def __init__(self, inner: _Stage0RecipeMetadata):
+        self._inner = inner
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+
+class Build:
+    """Build configuration at stage0."""
+
+    def __init__(self, inner: _Stage0Build):
+        self._inner = inner
+
+    @property
+    def number(self) -> Any:
+        """Get the build number (may be a template)."""
+        return self._inner.number
+
+    @property
+    def string(self) -> Optional[Any]:
+        """Get the build string (may be a template or None for auto-generated)."""
+        return self._inner.string
+
+    @property
+    def script(self) -> Any:
+        """Get the build script configuration."""
+        return self._inner.script
+
+    @property
+    def noarch(self) -> Optional[Any]:
+        """Get the noarch type (may be a template or None)."""
+        return self._inner.noarch
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+
+class Requirements:
+    """Requirements at stage0."""
+
+    def __init__(self, inner: _Stage0Requirements):
+        self._inner = inner
+
+    @property
+    def build(self) -> List[Any]:
+        """Get build-time requirements (list of matchspecs or templates)."""
+        return self._inner.build
+
+    @property
+    def host(self) -> List[Any]:
+        """Get host-time requirements (list of matchspecs or templates)."""
+        return self._inner.host
+
+    @property
+    def run(self) -> List[Any]:
+        """Get run-time requirements (list of matchspecs or templates)."""
+        return self._inner.run
+
+    @property
+    def run_constraints(self) -> List[Any]:
+        """Get run-time constraints (list of matchspecs or templates)."""
+        return self._inner.run_constraints
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+
+class About:
+    """About metadata at stage0."""
+
+    def __init__(self, inner: _Stage0About):
+        self._inner = inner
+
+    @property
+    def homepage(self) -> Optional[Any]:
+        """Get the homepage URL (may be a template or None)."""
+        return self._inner.homepage
+
+    @property
+    def license(self) -> Optional[Any]:
+        """Get the license (may be a template or None)."""
+        return self._inner.license
+
+    @property
+    def license_family(self) -> Optional[Any]:
+        """Get the license family (deprecated, may be a template or None)."""
+        return self._inner.license_family
+
+    @property
+    def summary(self) -> Optional[Any]:
+        """Get the summary (may be a template or None)."""
+        return self._inner.summary
+
+    @property
+    def description(self) -> Optional[Any]:
+        """Get the description (may be a template or None)."""
+        return self._inner.description
+
+    @property
+    def documentation(self) -> Optional[Any]:
+        """Get the documentation URL (may be a template or None)."""
+        return self._inner.documentation
+
+    @property
+    def repository(self) -> Optional[Any]:
+        """Get the repository URL (may be a template or None)."""
+        return self._inner.repository
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+
+class PackageOutput:
+    """A package output in a multi-output recipe."""
+
+    def __init__(self, inner: _Stage0PackageOutput):
+        self._inner = inner
+
+    @property
+    def package(self) -> Package:
+        """Get the package metadata for this output."""
+        return Package(self._inner.package)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+
+class StagingOutput:
+    """A staging output in a multi-output recipe."""
+
+    def __init__(self, inner: _Stage0StagingOutput):
+        self._inner = inner
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
diff --git a/py-rattler-build/rattler_build/stage1.py b/py-rattler-build/rattler_build/stage1.py
new file mode 100644
index 000000000..9dd6c7aeb
--- /dev/null
+++ b/py-rattler-build/rattler_build/stage1.py
@@ -0,0 +1,288 @@
+"""
+Stage1 - Evaluated recipe types ready for building.
+
+This module provides Python bindings for rattler-build's stage1 types,
+which represent the fully evaluated recipe with all Jinja templates resolved
+and conditionals evaluated.
+"""
+
+from typing import Any, Dict, List, Optional, TYPE_CHECKING
+
+if TYPE_CHECKING:
+    # For type checking, use Any as placeholder since we don't have stubs
+    _Stage1Recipe = Any
+    _Stage1Package = Any
+    _Stage1Build = Any
+    _Stage1Requirements = Any
+    _Stage1About = Any
+    _Stage1Source = Any
+    _Stage1StagingCache = Any
+else:
+    # At runtime, import the Rust submodule
+    from . import rattler_build as _rb
+
+    # Get the stage1 submodule
+    _stage1 = _rb.stage1
+
+    # Import classes from the stage1 submodule
+    _Stage1Recipe = _stage1.Stage1Recipe
+    _Stage1Package = _stage1.Stage1Package
+    _Stage1Build = _stage1.Stage1Build
+    _Stage1Requirements = _stage1.Stage1Requirements
+    _Stage1About = _stage1.Stage1About
+    _Stage1Source = _stage1.Stage1Source
+    _Stage1StagingCache = _stage1.Stage1StagingCache
+
+__all__ = [
+    "Recipe",
+    "Package",
+    "Build",
+    "Requirements",
+    "About",
+    "Source",
+    "StagingCache",
+]
+
+
+class Recipe:
+    """
+    A fully evaluated conda recipe (stage1), ready for building.
+
+    This represents the recipe after all Jinja templates have been evaluated
+    and all conditionals resolved.
+
+    Example:
+        >>> # After parsing and evaluating a stage0 recipe
+        >>> stage1_recipe = evaluate(stage0_recipe, context)
+        >>> print(stage1_recipe.package.name)
+        >>> print(stage1_recipe.package.version)
+    """
+
+    def __init__(self, inner: _Stage1Recipe):
+        self._inner = inner
+
+    @property
+    def package(self) -> "Package":
+        """Get the package metadata."""
+        return Package(self._inner.package)
+
+    @property
+    def build(self) -> "Build":
+        """Get the build configuration."""
+        return Build(self._inner.build)
+
+    @property
+    def requirements(self) -> "Requirements":
+        """Get the requirements."""
+        return Requirements(self._inner.requirements)
+
+    @property
+    def about(self) -> "About":
+        """Get the about metadata."""
+        return About(self._inner.about)
+
+    @property
+    def context(self) -> Dict[str, Any]:
+        """Get the evaluation context."""
+        return self._inner.context
+
+    @property
+    def used_variant(self) -> Dict[str, Any]:
+        """Get the variant values used in this build."""
+        return self._inner.used_variant
+
+    @property
+    def sources(self) -> List["Source"]:
+        """Get all sources for this recipe."""
+        return [Source(s) for s in self._inner.sources]
+
+    @property
+    def staging_caches(self) -> List["StagingCache"]:
+        """Get all staging caches."""
+        return [StagingCache(s) for s in self._inner.staging_caches]
+
+    @property
+    def inherits_from(self) -> Optional[Dict[str, Any]]:
+        """Get inheritance information if this output inherits from a cache."""
+        return self._inner.inherits_from
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+
+class Package:
+    """Package metadata at stage1 (fully evaluated)."""
+
+    def __init__(self, inner: _Stage1Package):
+        self._inner = inner
+
+    @property
+    def name(self) -> str:
+        """Get the package name."""
+        return self._inner.name
+
+    @property
+    def version(self) -> str:
+        """Get the package version."""
+        return self._inner.version
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+    def __str__(self) -> str:
+        return f"{self.name}-{self.version}"
+
+
+class Build:
+    """Build configuration at stage1 (fully evaluated)."""
+
+    def __init__(self, inner: _Stage1Build):
+        self._inner = inner
+
+    @property
+    def number(self) -> int:
+        """Get the build number."""
+        return self._inner.number
+
+    @property
+    def string(self) -> Any:
+        """Get the build string."""
+        return self._inner.string
+
+    @property
+    def script(self) -> Any:
+        """Get the build script."""
+        return self._inner.script
+
+    @property
+    def noarch(self) -> Optional[Any]:
+        """Get the noarch configuration if any."""
+        return self._inner.noarch
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+
+class Requirements:
+    """Requirements at stage1 (fully evaluated)."""
+
+    def __init__(self, inner: _Stage1Requirements):
+        self._inner = inner
+
+    @property
+    def build(self) -> List[Any]:
+        """Get build requirements."""
+        return self._inner.build
+
+    @property
+    def host(self) -> List[Any]:
+        """Get host requirements."""
+        return self._inner.host
+
+    @property
+    def run(self) -> List[Any]:
+        """Get run requirements."""
+        return self._inner.run
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+
+class About:
+    """About metadata at stage1 (fully evaluated)."""
+
+    def __init__(self, inner: _Stage1About):
+        self._inner = inner
+
+    @property
+    def homepage(self) -> Optional[str]:
+        """Get the homepage URL."""
+        return self._inner.homepage
+
+    @property
+    def repository(self) -> Optional[str]:
+        """Get the repository URL."""
+        return self._inner.repository
+
+    @property
+    def documentation(self) -> Optional[str]:
+        """Get the documentation URL."""
+        return self._inner.documentation
+
+    @property
+    def license(self) -> Optional[str]:
+        """Get the license string."""
+        return self._inner.license
+
+    @property
+    def summary(self) -> Optional[str]:
+        """Get the summary."""
+        return self._inner.summary
+
+    @property
+    def description(self) -> Optional[str]:
+        """Get the description."""
+        return self._inner.description
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+
+class Source:
+    """Source information at stage1 (fully evaluated)."""
+
+    def __init__(self, inner: _Stage1Source):
+        self._inner = inner
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+
+class StagingCache:
+    """Staging cache information at stage1 (fully evaluated)."""
+
+    def __init__(self, inner: _Stage1StagingCache):
+        self._inner = inner
+
+    @property
+    def name(self) -> str:
+        """Get the cache name."""
+        return self._inner.name
+
+    @property
+    def build(self) -> Build:
+        """Get the build configuration for this cache."""
+        return Build(self._inner.build)
+
+    @property
+    def requirements(self) -> Requirements:
+        """Get the requirements for this cache."""
+        return Requirements(self._inner.requirements)
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to Python dictionary."""
+        return self._inner.to_dict()
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
diff --git a/py-rattler-build/rattler_build/tool_config.py b/py-rattler-build/rattler_build/tool_config.py
new file mode 100644
index 000000000..2ae79dede
--- /dev/null
+++ b/py-rattler-build/rattler_build/tool_config.py
@@ -0,0 +1,216 @@
+"""
+Tool configuration for rattler-build.
+
+This module provides a Pythonic API for configuring the build tool.
+"""
+
+from typing import List, Optional, TYPE_CHECKING
+
+if TYPE_CHECKING:
+    # Type stub for the Rust ToolConfiguration
+    class _ToolConfiguration:
+        def __init__(
+            self,
+            keep_build: bool = ...,
+            compression_threads: Optional[int] = ...,
+            io_concurrency_limit: Optional[int] = ...,
+            test_strategy: Optional[str] = ...,
+            skip_existing: Optional[str] = ...,
+            continue_on_failure: bool = ...,
+            noarch_build_platform: Optional[str] = ...,
+            channel_priority: Optional[str] = ...,
+            allow_insecure_host: Optional[List[str]] = ...,
+            error_prefix_in_binary: bool = ...,
+            allow_symlinks_on_windows: bool = ...,
+            use_zstd: bool = ...,
+            use_bz2: bool = ...,
+            use_sharded: bool = ...,
+            use_jlap: bool = ...,
+        ) -> None: ...
+        @property
+        def keep_build(self) -> bool: ...
+        def set_keep_build(self, value: bool) -> None: ...
+        @property
+        def test_strategy(self) -> str: ...
+        @property
+        def skip_existing(self) -> str: ...
+        @property
+        def continue_on_failure(self) -> bool: ...
+        @property
+        def channel_priority(self) -> str: ...
+        @property
+        def use_zstd(self) -> bool: ...
+        @property
+        def use_bz2(self) -> bool: ...
+        @property
+        def use_sharded(self) -> bool: ...
+        @property
+        def use_jlap(self) -> bool: ...
+        @property
+        def compression_threads(self) -> Optional[int]: ...
+        @property
+        def io_concurrency_limit(self) -> Optional[int]: ...
+        @property
+        def allow_insecure_host(self) -> Optional[List[str]]: ...
+        @property
+        def error_prefix_in_binary(self) -> bool: ...
+        @property
+        def allow_symlinks_on_windows(self) -> bool: ...
+else:
+    from . import rattler_build as _rb
+
+    _ToolConfiguration = _rb.tool_config.ToolConfiguration
+
+
+class ToolConfiguration:
+    """Configuration for the rattler-build tool.
+
+    This class wraps the Rust ToolConfiguration and provides a Pythonic interface
+    for configuring build behavior.
+
+    Args:
+        keep_build: Whether to keep the build directory after the build is done
+        compression_threads: Number of threads to use for compression (default: None - auto)
+        io_concurrency_limit: Maximum number of concurrent I/O operations (default: None)
+        test_strategy: Test strategy to use ("skip", "native", or "tests") (default: "skip")
+        skip_existing: Whether to skip packages that already exist ("none", "local", or "all") (default: "none")
+        continue_on_failure: Whether to continue building other recipes even if one fails (default: False)
+        noarch_build_platform: Platform to use for noarch builds (default: None)
+        channel_priority: Channel priority for solving ("strict" or "disabled") (default: "strict")
+        allow_insecure_host: List of hosts for which SSL certificate verification should be skipped
+        error_prefix_in_binary: Whether to error if the host prefix is detected in binary files (default: False)
+        allow_symlinks_on_windows: Whether to allow symlinks in packages on Windows (default: False)
+        use_zstd: Whether to use zstd compression when downloading repodata (default: True)
+        use_bz2: Whether to use bzip2 compression when downloading repodata (default: True)
+        use_sharded: Whether to use sharded repodata when downloading (default: True)
+        use_jlap: Whether to use JLAP when downloading repodata (default: False)
+
+    Example:
+        >>> config = ToolConfiguration(
+        ...     keep_build=True,
+        ...     test_strategy="native",
+        ...     compression_threads=4
+        ... )
+        >>> print(config.keep_build)
+        True
+        >>> print(config.test_strategy)
+        Native
+    """
+
+    def __init__(
+        self,
+        keep_build: bool = False,
+        compression_threads: Optional[int] = None,
+        io_concurrency_limit: Optional[int] = None,
+        test_strategy: Optional[str] = None,
+        skip_existing: Optional[str] = None,
+        continue_on_failure: bool = False,
+        noarch_build_platform: Optional[str] = None,
+        channel_priority: Optional[str] = None,
+        allow_insecure_host: Optional[List[str]] = None,
+        error_prefix_in_binary: bool = False,
+        allow_symlinks_on_windows: bool = False,
+        use_zstd: bool = True,
+        use_bz2: bool = True,
+        use_sharded: bool = True,
+        use_jlap: bool = False,
+    ):
+        """Create a new tool configuration."""
+        self._inner = _ToolConfiguration(
+            keep_build=keep_build,
+            compression_threads=compression_threads,
+            io_concurrency_limit=io_concurrency_limit,
+            test_strategy=test_strategy,
+            skip_existing=skip_existing,
+            continue_on_failure=continue_on_failure,
+            noarch_build_platform=noarch_build_platform,
+            channel_priority=channel_priority,
+            allow_insecure_host=allow_insecure_host,
+            error_prefix_in_binary=error_prefix_in_binary,
+            allow_symlinks_on_windows=allow_symlinks_on_windows,
+            use_zstd=use_zstd,
+            use_bz2=use_bz2,
+            use_sharded=use_sharded,
+            use_jlap=use_jlap,
+        )
+
+    @property
+    def keep_build(self) -> bool:
+        """Whether to keep the build directory after the build is done."""
+        return self._inner.keep_build
+
+    @keep_build.setter
+    def keep_build(self, value: bool) -> None:
+        """Set whether to keep the build directory."""
+        self._inner.set_keep_build(value)
+
+    @property
+    def test_strategy(self) -> str:
+        """The test strategy to use."""
+        return self._inner.test_strategy
+
+    @property
+    def skip_existing(self) -> str:
+        """Whether to skip existing packages."""
+        return self._inner.skip_existing
+
+    @property
+    def continue_on_failure(self) -> bool:
+        """Whether to continue building on failure."""
+        return self._inner.continue_on_failure
+
+    @property
+    def channel_priority(self) -> str:
+        """The channel priority to use in solving."""
+        return self._inner.channel_priority
+
+    @property
+    def use_zstd(self) -> bool:
+        """Whether to use zstd compression."""
+        return self._inner.use_zstd
+
+    @property
+    def use_bz2(self) -> bool:
+        """Whether to use bzip2 compression."""
+        return self._inner.use_bz2
+
+    @property
+    def use_sharded(self) -> bool:
+        """Whether to use sharded repodata."""
+        return self._inner.use_sharded
+
+    @property
+    def use_jlap(self) -> bool:
+        """Whether to use JLAP."""
+        return self._inner.use_jlap
+
+    @property
+    def compression_threads(self) -> Optional[int]:
+        """Number of compression threads."""
+        return self._inner.compression_threads
+
+    @property
+    def io_concurrency_limit(self) -> Optional[int]:
+        """IO concurrency limit."""
+        return self._inner.io_concurrency_limit
+
+    @property
+    def allow_insecure_host(self) -> Optional[List[str]]:
+        """List of hosts for which SSL certificate verification should be skipped."""
+        return self._inner.allow_insecure_host
+
+    @property
+    def error_prefix_in_binary(self) -> bool:
+        """Whether to error if the host prefix is detected in binary files."""
+        return self._inner.error_prefix_in_binary
+
+    @property
+    def allow_symlinks_on_windows(self) -> bool:
+        """Whether to allow symlinks in packages on Windows."""
+        return self._inner.allow_symlinks_on_windows
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+
+__all__ = ["ToolConfiguration"]
diff --git a/py-rattler-build/rattler_build/variant_config.py b/py-rattler-build/rattler_build/variant_config.py
new file mode 100644
index 000000000..d896893d1
--- /dev/null
+++ b/py-rattler-build/rattler_build/variant_config.py
@@ -0,0 +1,491 @@
+"""
+VariantConfig - Manage variant configuration for recipe builds.
+
+This module provides Python bindings for rattler-build's VariantConfig,
+which manages variant matrices for building packages with different configurations.
+"""
+
+from pathlib import Path
+from typing import Any, Dict, ItemsView, Iterator, List, Optional, Union, ValuesView
+from .rattler_build import VariantConfig as _VariantConfig, PyJinjaConfig
+from .jinja_config import JinjaConfig
+
+__all__ = ["VariantConfig"]
+
+
+class VariantConfig:
+    """
+    Configuration for build variants.
+
+    Variants allow building the same recipe with different configurations,
+    such as different Python versions, compilers, or other parameters.
+
+    This class provides a dict-like interface for managing variants.
+
+    Example:
+        >>> # Create from dict
+        >>> config = VariantConfig({
+        ...     "python": ["3.8", "3.9", "3.10"],
+        ...     "numpy": ["1.21", "1.22"]
+        ... })
+        >>> len(config.combinations())  # 3 * 2 = 6 combinations
+        6
+
+        >>> # Dict-like access
+        >>> config["python"] = ["3.9", "3.10"]
+        >>> print(config["python"])
+        ['3.9', '3.10']
+
+        >>> # Traditional method calls
+        >>> config.set_values("compiler", ["gcc", "clang"])
+        >>> print(config.get_values("compiler"))
+        ['gcc', 'clang']
+
+        >>> # Load from YAML file
+        >>> config = VariantConfig.from_file("variant_config.yaml")
+        >>> print(config.keys())
+    """
+
+    def __init__(self, variants: Optional[Union[Dict[str, List[Any]], _VariantConfig]] = None):
+        """
+        Create a new VariantConfig.
+
+        Args:
+            variants: Either a dictionary mapping variant keys to value lists,
+                     or an existing _VariantConfig instance. If None, creates empty config.
+
+        Example:
+            >>> # Create from dict
+            >>> config = VariantConfig({"python": ["3.9", "3.10"]})
+
+            >>> # Create empty
+            >>> config = VariantConfig()
+        """
+        if variants is None:
+            self._inner = _VariantConfig()
+        elif isinstance(variants, dict):
+            self._inner = _VariantConfig()
+            for key, values in variants.items():
+                self._inner.set_values(key, values)
+        else:
+            self._inner = variants
+
+    @classmethod
+    def from_file(cls, path: Union[str, Path]) -> "VariantConfig":
+        """
+        Load VariantConfig from a YAML file (variants.yaml format).
+
+        Args:
+            path: Path to the variant configuration YAML file
+
+        Returns:
+            A new VariantConfig instance
+
+        Example:
+            >>> config = VariantConfig.from_file("variants.yaml")
+        """
+        return cls(_VariantConfig.from_file(Path(path)))
+
+    @classmethod
+    def from_file_with_context(
+        cls, path: Union[str, Path], jinja_config: Union[PyJinjaConfig, JinjaConfig]
+    ) -> "VariantConfig":
+        """
+        Load VariantConfig from a YAML file with a JinjaConfig context (variants.yaml format).
+
+        This allows evaluation of conditionals and templates in the variant file.
+        The jinja_config provides platform information and other context needed for evaluation.
+
+        Args:
+            path: Path to the variant configuration YAML file
+            jinja_config: JinjaConfig providing context for evaluation
+
+        Returns:
+            A new VariantConfig instance
+
+        Example:
+            >>> from rattler_build import JinjaConfig
+            >>> jinja_config = JinjaConfig(target_platform="linux-64")
+            >>> config = VariantConfig.from_file_with_context("variants.yaml", jinja_config)
+        """
+        # Convert JinjaConfig to PyJinjaConfig if needed
+        py_config = jinja_config._config if isinstance(jinja_config, JinjaConfig) else jinja_config
+        return cls(_VariantConfig.from_file_with_context(Path(path), py_config))
+
+    @classmethod
+    def from_conda_build_config(
+        cls, path: Union[str, Path], jinja_config: Union[PyJinjaConfig, JinjaConfig]
+    ) -> "VariantConfig":
+        """
+        Load VariantConfig from a conda_build_config.yaml file.
+
+        This supports the legacy conda-build format with `# [selector]` syntax.
+        Selectors are evaluated using the provided JinjaConfig.
+
+        Args:
+            path: Path to the conda_build_config.yaml file
+            jinja_config: JinjaConfig providing context for selector evaluation
+
+        Returns:
+            A new VariantConfig instance
+
+        Example:
+            >>> from rattler_build import JinjaConfig
+            >>> jinja_config = JinjaConfig(target_platform="linux-64")
+            >>> config = VariantConfig.from_conda_build_config("conda_build_config.yaml", jinja_config)
+        """
+        # Convert JinjaConfig to PyJinjaConfig if needed
+        py_config = jinja_config._config if isinstance(jinja_config, JinjaConfig) else jinja_config
+        return cls(_VariantConfig.from_conda_build_config(Path(path), py_config))
+
+    @classmethod
+    def from_yaml(cls, yaml: str) -> "VariantConfig":
+        """
+        Load VariantConfig from a YAML string (variants.yaml format).
+
+        Args:
+            yaml: YAML string containing variant configuration
+
+        Returns:
+            A new VariantConfig instance
+
+        Example:
+            >>> yaml_str = '''
+            ... python:
+            ...   - "3.8"
+            ...   - "3.9"
+            ... '''
+            >>> config = VariantConfig.from_yaml(yaml_str)
+        """
+        return cls(_VariantConfig.from_yaml(yaml))
+
+    @classmethod
+    def from_yaml_with_context(cls, yaml: str, jinja_config: Union[PyJinjaConfig, JinjaConfig]) -> "VariantConfig":
+        """
+        Load VariantConfig from a YAML string with a JinjaConfig context (variants.yaml format).
+
+        This allows evaluation of conditionals and templates in the variant YAML.
+        The jinja_config provides platform information and other context needed for evaluation.
+
+        Args:
+            yaml: YAML string containing variant configuration
+            jinja_config: JinjaConfig providing context for evaluation
+
+        Returns:
+            A new VariantConfig instance
+
+        Example:
+            >>> from rattler_build import JinjaConfig
+            >>> yaml_str = '''
+            ... c_compiler:
+            ...   - if: unix
+            ...     then: gcc
+            ...   - if: win
+            ...     then: msvc
+            ... '''
+            >>> jinja_config = JinjaConfig(target_platform="linux-64")
+            >>> config = VariantConfig.from_yaml_with_context(yaml_str, jinja_config)
+        """
+        # Convert JinjaConfig to PyJinjaConfig if needed
+        py_config = jinja_config._config if isinstance(jinja_config, JinjaConfig) else jinja_config
+        return cls(_VariantConfig.from_yaml_with_context(yaml, py_config))
+
+    def keys(self) -> List[str]:
+        """
+        Get all variant keys.
+
+        Returns:
+            List of variant key names
+
+        Example:
+            >>> config = VariantConfig()
+            >>> config.set_values("python", ["3.8", "3.9"])
+            >>> config.set_values("numpy", ["1.21"])
+            >>> config.keys()
+            ['numpy', 'python']
+        """
+        return self._inner.keys()
+
+    @property
+    def zip_keys(self) -> Optional[List[List[str]]]:
+        """
+        Get zip_keys - groups of keys that should be zipped together.
+
+        Zip keys ensure that certain variant keys are synchronized when creating
+        combinations. For example, if python and numpy are zipped, then
+        python=3.9 will always be paired with numpy=1.20, not with other numpy versions.
+
+        Returns:
+            List of groups (each group is a list of keys), or None if no zip keys are defined
+
+        Example:
+            >>> config = VariantConfig()
+            >>> config.set_values("python", ["3.9", "3.10"])
+            >>> config.set_values("numpy", ["1.20", "1.21"])
+            >>> config.zip_keys = [["python", "numpy"]]
+            >>> len(config.combinations())  # 2, not 4
+            2
+        """
+        return self._inner.zip_keys
+
+    @zip_keys.setter
+    def zip_keys(self, value: Optional[List[List[str]]]) -> None:
+        """
+        Set zip_keys - groups of keys that should be zipped together.
+
+        Args:
+            value: List of groups (each group is a list of keys), or None to clear
+
+        Example:
+            >>> config = VariantConfig()
+            >>> config.zip_keys = [["python", "numpy"], ["c_compiler", "cxx_compiler"]]
+        """
+        self._inner.zip_keys = value
+
+    def get_values(self, key: str) -> Optional[List[Any]]:
+        """
+        Get values for a specific variant key.
+
+        Args:
+            key: The variant key name
+
+        Returns:
+            List of values for the key, or None if key doesn't exist
+
+        Example:
+            >>> config = VariantConfig()
+            >>> config.set_values("python", ["3.8", "3.9", "3.10"])
+            >>> config.get_values("python")
+            ['3.8', '3.9', '3.10']
+        """
+        return self._inner.get_values(key)
+
+    def set_values(self, key: str, values: List[Any]) -> None:
+        """
+        Set values for a variant key.
+
+        Args:
+            key: The variant key name
+            values: List of values for this key
+
+        Example:
+            >>> config = VariantConfig()
+            >>> config.set_values("python", ["3.8", "3.9", "3.10"])
+            >>> config.set_values("numpy", ["1.21", "1.22"])
+        """
+        self._inner.set_values(key, values)
+
+    def to_dict(self) -> Dict[str, List[Any]]:
+        """
+        Get all variants as a dictionary.
+
+        Returns:
+            Dictionary mapping variant keys to their value lists
+
+        Example:
+            >>> config = VariantConfig()
+            >>> config.set_values("python", ["3.8", "3.9"])
+            >>> config.to_dict()
+            {'python': ['3.8', '3.9']}
+        """
+        return self._inner.to_dict()
+
+    def merge(self, other: "VariantConfig") -> None:
+        """
+        Merge another VariantConfig into this one.
+
+        Args:
+            other: Another VariantConfig to merge
+
+        Example:
+            >>> config1 = VariantConfig()
+            >>> config1.set_values("python", ["3.8", "3.9"])
+            >>> config2 = VariantConfig()
+            >>> config2.set_values("numpy", ["1.21"])
+            >>> config1.merge(config2)
+            >>> config1.keys()
+            ['numpy', 'python']
+        """
+        self._inner.merge(other._inner)
+
+    def combinations(self) -> List[Dict[str, Any]]:
+        """
+        Generate all combinations of variant values.
+
+        Returns:
+            List of dictionaries, each representing one variant combination
+
+        Example:
+            >>> config = VariantConfig()
+            >>> config.set_values("python", ["3.8", "3.9"])
+            >>> config.set_values("numpy", ["1.21", "1.22"])
+            >>> combos = config.combinations()
+            >>> len(combos)
+            4
+            >>> combos[0]
+            {'python': '3.8', 'numpy': '1.21'}
+        """
+        return self._inner.combinations()
+
+    def __len__(self) -> int:
+        """Get the number of variant keys."""
+        return len(self._inner)
+
+    def __getitem__(self, key: str) -> List[Any]:
+        """
+        Get values for a variant key using dict-like access.
+
+        Args:
+            key: The variant key name
+
+        Returns:
+            List of values for the key
+
+        Raises:
+            KeyError: If the key doesn't exist
+
+        Example:
+            >>> config = VariantConfig({"python": ["3.9", "3.10"]})
+            >>> config["python"]
+            ['3.9', '3.10']
+        """
+        values = self._inner.get_values(key)
+        if values is None:
+            raise KeyError(f"Variant key '{key}' not found")
+        return values
+
+    def __setitem__(self, key: str, values: List[Any]) -> None:
+        """
+        Set values for a variant key using dict-like access.
+
+        Args:
+            key: The variant key name
+            values: List of values for this key
+
+        Example:
+            >>> config = VariantConfig()
+            >>> config["python"] = ["3.9", "3.10"]
+            >>> config["numpy"] = ["1.21", "1.22"]
+        """
+        self._inner.set_values(key, values)
+
+    def __contains__(self, key: str) -> bool:
+        """
+        Check if a variant key exists.
+
+        Args:
+            key: The variant key name
+
+        Returns:
+            True if the key exists, False otherwise
+
+        Example:
+            >>> config = VariantConfig({"python": ["3.9"]})
+            >>> "python" in config
+            True
+            >>> "ruby" in config
+            False
+        """
+        return self._inner.get_values(key) is not None
+
+    def __delitem__(self, key: str) -> None:
+        """
+        Delete a variant key (not implemented - raises NotImplementedError).
+
+        Args:
+            key: The variant key name
+
+        Raises:
+            NotImplementedError: Deletion is not supported
+        """
+        raise NotImplementedError("Deletion of variant keys is not supported")
+
+    def __iter__(self) -> Iterator[str]:
+        """
+        Iterate over variant keys.
+
+        Returns:
+            Iterator over variant key names
+
+        Example:
+            >>> config = VariantConfig({"python": ["3.9"], "numpy": ["1.21"]})
+            >>> list(config)
+            ['numpy', 'python']
+        """
+        return iter(self.keys())
+
+    def items(self) -> ItemsView[str, List[str]]:
+        """
+        Get all variant key-value pairs.
+
+        Returns:
+            Iterator of (key, values) tuples
+
+        Example:
+            >>> config = VariantConfig({"python": ["3.9", "3.10"]})
+            >>> dict(config.items())
+            {'python': ['3.9', '3.10']}
+        """
+        return self.to_dict().items()
+
+    def values(self) -> ValuesView[List[str]]:
+        """
+        Get all variant value lists.
+
+        Returns:
+            Iterator of value lists
+
+        Example:
+            >>> config = VariantConfig({"python": ["3.9", "3.10"]})
+            >>> list(config.values())
+            [['3.9', '3.10']]
+        """
+        return self.to_dict().values()
+
+    def get(self, key: str, default: Optional[List[Any]] = None) -> Optional[List[Any]]:
+        """
+        Get values for a variant key with a default.
+
+        Args:
+            key: The variant key name
+            default: Default value if key doesn't exist
+
+        Returns:
+            List of values for the key, or default if key doesn't exist
+
+        Example:
+            >>> config = VariantConfig({"python": ["3.9"]})
+            >>> config.get("python")
+            ['3.9']
+            >>> config.get("ruby", ["2.7"])
+            ['2.7']
+        """
+        values = self._inner.get_values(key)
+        return values if values is not None else default
+
+    def update(self, other: Union["VariantConfig", Dict[str, List[Any]]]) -> None:
+        """
+        Update this config with values from another config or dict.
+
+        Args:
+            other: Another VariantConfig or dict to merge
+
+        Example:
+            >>> config = VariantConfig({"python": ["3.9"]})
+            >>> config.update({"numpy": ["1.21"]})
+            >>> config.keys()
+            ['numpy', 'python']
+        """
+        if isinstance(other, VariantConfig):
+            self.merge(other)
+        elif isinstance(other, dict):
+            for key, values in other.items():
+                self.set_values(key, values)
+        else:
+            raise TypeError(f"Expected VariantConfig or dict, got {type(other)}")
+
+    def __repr__(self) -> str:
+        return repr(self._inner)
+
+    def __str__(self) -> str:
+        return f"VariantConfig(keys={self.keys()})"
diff --git a/py-rattler-build/src/build_types.rs b/py-rattler-build/src/build_types.rs
new file mode 100644
index 000000000..0e05d8a45
--- /dev/null
+++ b/py-rattler-build/src/build_types.rs
@@ -0,0 +1,152 @@
+use pyo3::prelude::*;
+use rattler_build::types::{Directories, PackagingSettings};
+use rattler_conda_types::package::ArchiveType;
+use std::path::PathBuf;
+
+use crate::error::RattlerBuildError;
+
+/// Python wrapper for Directories
+#[pyclass(name = "Directories")]
+#[derive(Clone)]
+pub struct PyDirectories {
+    pub(crate) inner: Directories,
+}
+
+#[pymethods]
+impl PyDirectories {
+    /// Get the recipe directory
+    #[getter]
+    fn recipe_dir(&self) -> PathBuf {
+        self.inner.recipe_dir.clone()
+    }
+
+    /// Get the work directory
+    #[getter]
+    fn work_dir(&self) -> PathBuf {
+        self.inner.work_dir.clone()
+    }
+
+    /// Get the host prefix directory
+    #[getter]
+    fn host_prefix(&self) -> PathBuf {
+        self.inner.host_prefix.clone()
+    }
+
+    /// Get the build prefix directory
+    #[getter]
+    fn build_prefix(&self) -> PathBuf {
+        self.inner.build_prefix.clone()
+    }
+
+    /// Get the output directory
+    #[getter]
+    fn output_dir(&self) -> PathBuf {
+        self.inner.output_dir.clone()
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "Directories(recipe_dir='{}', work_dir='{}', host_prefix='{}', build_prefix='{}', output_dir='{}')",
+            self.inner.recipe_dir.display(),
+            self.inner.work_dir.display(),
+            self.inner.host_prefix.display(),
+            self.inner.build_prefix.display(),
+            self.inner.output_dir.display()
+        )
+    }
+}
+
+/// Python wrapper for PackagingSettings
+#[pyclass(name = "PackagingSettings")]
+#[derive(Clone)]
+pub struct PyPackagingSettings {
+    pub(crate) inner: PackagingSettings,
+}
+
+#[pymethods]
+impl PyPackagingSettings {
+    /// Create a new packaging settings
+    #[new]
+    #[pyo3(signature = (archive_type="conda", compression_level=None))]
+    fn new(archive_type: &str, compression_level: Option<i32>) -> PyResult<Self> {
+        let archive_type = match archive_type.to_lowercase().as_str() {
+            "conda" => ArchiveType::Conda,
+            "tar-bz2" | "tar.bz2" | "tarbz2" => ArchiveType::TarBz2,
+            _ => {
+                return Err(RattlerBuildError::Other(format!(
+                    "Invalid archive type: {}. Must be 'conda' or 'tar-bz2'",
+                    archive_type
+                ))
+                .into());
+            }
+        };
+
+        // Default compression levels
+        let compression_level = compression_level.unwrap_or(match archive_type {
+            ArchiveType::Conda => 22, // zstd default
+            ArchiveType::TarBz2 => 9, // bzip2 default
+        });
+
+        Ok(Self {
+            inner: PackagingSettings {
+                archive_type,
+                compression_level,
+            },
+        })
+    }
+
+    /// Get the archive type as a string
+    #[getter]
+    fn archive_type(&self) -> String {
+        match self.inner.archive_type {
+            ArchiveType::Conda => "conda".to_string(),
+            ArchiveType::TarBz2 => "tar-bz2".to_string(),
+        }
+    }
+
+    /// Get the compression level
+    #[getter]
+    fn compression_level(&self) -> i32 {
+        self.inner.compression_level
+    }
+
+    /// Set the archive type
+    #[setter]
+    fn set_archive_type(&mut self, archive_type: &str) -> PyResult<()> {
+        self.inner.archive_type = match archive_type.to_lowercase().as_str() {
+            "conda" => ArchiveType::Conda,
+            "tar-bz2" | "tar.bz2" | "tarbz2" => ArchiveType::TarBz2,
+            _ => {
+                return Err(RattlerBuildError::Other(format!(
+                    "Invalid archive type: {}. Must be 'conda' or 'tar-bz2'",
+                    archive_type
+                ))
+                .into());
+            }
+        };
+        Ok(())
+    }
+
+    /// Set the compression level
+    #[setter]
+    fn set_compression_level(&mut self, level: i32) {
+        self.inner.compression_level = level;
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "PackagingSettings(archive_type='{}', compression_level={})",
+            self.archive_type(),
+            self.inner.compression_level
+        )
+    }
+}
+
+/// Register the build_types module with Python
+pub fn register_build_types_module(py: Python<'_>, parent: &Bound<'_, PyModule>) -> PyResult<()> {
+    let m = PyModule::new(py, "build_types")?;
+    m.add_class::<PyDirectories>()?;
+    m.add_class::<PyPackagingSettings>()?;
+    parent.add_submodule(&m)?;
+    Ok(())
+}
diff --git a/py-rattler-build/src/jinja_config.rs b/py-rattler-build/src/jinja_config.rs
new file mode 100644
index 000000000..203a2afb5
--- /dev/null
+++ b/py-rattler-build/src/jinja_config.rs
@@ -0,0 +1,265 @@
+use serde_json::Value as JsonValue;
+use std::{
+    collections::{BTreeMap, HashMap},
+    path::PathBuf,
+    str::FromStr,
+};
+
+use crate::error::RattlerBuildError;
+use pyo3::prelude::*;
+
+use rattler_build_jinja::{JinjaConfig, NormalizedKey, UndefinedBehavior, Variable};
+use rattler_conda_types::Platform;
+
+/// Python wrapper for JinjaConfig
+#[pyclass(name = "PyJinjaConfig")]
+#[derive(Clone)]
+pub struct PyJinjaConfig {
+    pub(crate) inner: JinjaConfig,
+}
+
+#[pymethods]
+impl PyJinjaConfig {
+    #[new]
+    #[pyo3(signature = (target_platform=None, host_platform=None, build_platform=None, variant=None, experimental=None, allow_undefined=None, recipe_path=None))]
+    #[allow(clippy::too_many_arguments)]
+    fn new(
+        py: Python<'_>,
+        target_platform: Option<String>,
+        host_platform: Option<String>,
+        build_platform: Option<String>,
+        variant: Option<HashMap<String, Py<PyAny>>>,
+        experimental: Option<bool>,
+        allow_undefined: Option<bool>,
+        recipe_path: Option<PathBuf>,
+    ) -> PyResult<Self> {
+        let target_platform = target_platform
+            .map(|p| Platform::from_str(&p))
+            .transpose()
+            .map_err(RattlerBuildError::from)?
+            .unwrap_or_else(Platform::current);
+
+        let host_platform = host_platform
+            .map(|p| Platform::from_str(&p))
+            .transpose()
+            .map_err(RattlerBuildError::from)?
+            .unwrap_or_else(Platform::current);
+
+        let build_platform = build_platform
+            .map(|p| Platform::from_str(&p))
+            .transpose()
+            .map_err(RattlerBuildError::from)?
+            .unwrap_or_else(Platform::current);
+
+        // Convert variant from Python dict to BTreeMap<NormalizedKey, Variable>
+        let variant_map = if let Some(variant_dict) = variant {
+            let mut map = BTreeMap::new();
+            for (key, value) in variant_dict {
+                let normalized_key = NormalizedKey::from(key);
+                // Convert Python object to JSON Value then to Variable
+                let json_val: serde_json::Value =
+                    pythonize::depythonize(value.bind(py)).map_err(|e| {
+                        RattlerBuildError::Variant(format!(
+                            "Failed to convert variant value: {}",
+                            e
+                        ))
+                    })?;
+                let variable = match &json_val {
+                    JsonValue::String(s) => Variable::from_string(s),
+                    JsonValue::Bool(b) => Variable::from(*b),
+                    JsonValue::Number(n) => {
+                        if let Some(i) = n.as_i64() {
+                            Variable::from(i)
+                        } else {
+                            Variable::from_string(&n.to_string())
+                        }
+                    }
+
+                    JsonValue::Array(arr) => {
+                        let vars: Result<Vec<Variable>, RattlerBuildError> = arr
+                            .iter()
+                            .map(|v| match v {
+                                JsonValue::String(s) => Ok(Variable::from_string(s)),
+                                JsonValue::Bool(b) => Ok(Variable::from(*b)),
+                                JsonValue::Number(n) => Ok(if let Some(i) = n.as_i64() {
+                                    Variable::from(i)
+                                } else {
+                                    Variable::from_string(&n.to_string())
+                                }),
+                                _ => Err(RattlerBuildError::Variant(
+                                    "Complex array elements not supported".to_string(),
+                                )),
+                            })
+                            .collect();
+                        Variable::from(vars?)
+                    }
+                    _ => {
+                        return Err(RattlerBuildError::Variant(
+                            "Object and null variants not supported".to_string(),
+                        )
+                        .into());
+                    }
+                };
+                map.insert(normalized_key, variable);
+            }
+            Ok::<BTreeMap<NormalizedKey, Variable>, RattlerBuildError>(map)?
+        } else {
+            BTreeMap::new()
+        };
+
+        // Convert allow_undefined to undefined_behavior
+        let undefined_behavior = if allow_undefined.unwrap_or(false) {
+            UndefinedBehavior::Lenient
+        } else {
+            UndefinedBehavior::SemiStrict
+        };
+
+        let jinja_config = JinjaConfig {
+            target_platform,
+            host_platform,
+            build_platform,
+            variant: variant_map,
+            experimental: experimental.unwrap_or(false),
+            recipe_path,
+            undefined_behavior,
+        };
+
+        Ok(PyJinjaConfig {
+            inner: jinja_config,
+        })
+    }
+
+    #[getter]
+    fn target_platform(&self) -> String {
+        self.inner.target_platform.to_string()
+    }
+
+    #[setter]
+    fn set_target_platform(&mut self, value: String) -> PyResult<()> {
+        let platform = Platform::from_str(&value).map_err(RattlerBuildError::from)?;
+        self.inner.target_platform = platform;
+        Ok(())
+    }
+
+    #[getter]
+    fn host_platform(&self) -> String {
+        self.inner.host_platform.to_string()
+    }
+
+    #[setter]
+    fn set_host_platform(&mut self, value: String) -> PyResult<()> {
+        let platform = Platform::from_str(&value).map_err(RattlerBuildError::from)?;
+        self.inner.host_platform = platform;
+        Ok(())
+    }
+
+    #[getter]
+    fn build_platform(&self) -> String {
+        self.inner.build_platform.to_string()
+    }
+
+    #[setter]
+    fn set_build_platform(&mut self, value: String) -> PyResult<()> {
+        let platform = Platform::from_str(&value).map_err(RattlerBuildError::from)?;
+        self.inner.build_platform = platform;
+        Ok(())
+    }
+
+    #[getter]
+    fn experimental(&self) -> bool {
+        self.inner.experimental
+    }
+
+    #[setter]
+    fn set_experimental(&mut self, value: bool) {
+        self.inner.experimental = value;
+    }
+
+    #[getter]
+    fn allow_undefined(&self) -> bool {
+        matches!(self.inner.undefined_behavior, UndefinedBehavior::Lenient)
+    }
+
+    #[setter]
+    fn set_allow_undefined(&mut self, value: bool) {
+        self.inner.undefined_behavior = if value {
+            UndefinedBehavior::Lenient
+        } else {
+            UndefinedBehavior::SemiStrict
+        };
+    }
+
+    #[getter]
+    fn recipe_path(&self) -> Option<PathBuf> {
+        self.inner.recipe_path.clone()
+    }
+
+    #[setter]
+    fn set_recipe_path(&mut self, value: Option<PathBuf>) {
+        self.inner.recipe_path = value;
+    }
+
+    #[getter]
+    fn variant(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let mut dict = HashMap::new();
+        for (key, value) in &self.inner.variant {
+            let json_value = serde_json::to_value(value).map_err(RattlerBuildError::from)?;
+            dict.insert(key.normalize(), json_value);
+        }
+        Ok(pythonize::pythonize(py, &dict)
+            .map(|obj| obj.into())
+            .map_err(|e| {
+                RattlerBuildError::Variant(format!("Failed to convert variant to Python: {}", e))
+            })?)
+    }
+
+    #[setter]
+    fn set_variant(&mut self, py: Python<'_>, value: HashMap<String, Py<PyAny>>) -> PyResult<()> {
+        let mut map = BTreeMap::new();
+        for (key, py_value) in value {
+            let normalized_key = NormalizedKey::from(key);
+            let json_val: serde_json::Value =
+                pythonize::depythonize(py_value.bind(py)).map_err(|e| {
+                    RattlerBuildError::Variant(format!("Failed to convert variant value: {}", e))
+                })?;
+            let variable = match &json_val {
+                JsonValue::String(s) => Variable::from_string(s),
+                JsonValue::Bool(b) => Variable::from(*b),
+                JsonValue::Number(n) => {
+                    if let Some(i) = n.as_i64() {
+                        Variable::from(i)
+                    } else {
+                        Variable::from_string(&n.to_string())
+                    }
+                }
+                JsonValue::Array(arr) => {
+                    let vars: Result<Vec<Variable>, RattlerBuildError> = arr
+                        .iter()
+                        .map(|v| match v {
+                            JsonValue::String(s) => Ok(Variable::from_string(s)),
+                            JsonValue::Bool(b) => Ok(Variable::from(*b)),
+                            JsonValue::Number(n) => Ok(if let Some(i) = n.as_i64() {
+                                Variable::from(i)
+                            } else {
+                                Variable::from_string(&n.to_string())
+                            }),
+                            _ => Err(RattlerBuildError::Variant(
+                                "Complex array elements not supported".to_string(),
+                            )),
+                        })
+                        .collect();
+                    Variable::from(vars?)
+                }
+                _ => {
+                    return Err(RattlerBuildError::Variant(
+                        "Object and null variants not supported".to_string(),
+                    )
+                    .into());
+                }
+            };
+            map.insert(normalized_key, variable);
+        }
+        self.inner.variant = map;
+        Ok(())
+    }
+}
diff --git a/py-rattler-build/src/lib.rs b/py-rattler-build/src/lib.rs
index 52b64e2f5..5206e0491 100644
--- a/py-rattler-build/src/lib.rs
+++ b/py-rattler-build/src/lib.rs
@@ -1,37 +1,33 @@
-use serde_json::Value as JsonValue;
-use std::{
-    collections::{BTreeMap, HashMap},
-    future::Future,
-    path::PathBuf,
-    str::FromStr,
-};
+use std::{collections::HashMap, future::Future, path::PathBuf, str::FromStr};
 
 use ::rattler_build::{
-    NormalizedKey, Variable, build_recipes, get_rattler_build_version,
-    hash::HashInfo,
+    build_recipes, get_rattler_build_version,
     metadata::Debug,
     opt::{BuildData, ChannelPriorityWrapper, CommonData, TestData},
-    recipe::parser::Recipe,
-    recipe_generator::{
-        CpanOpts, PyPIOpts, generate_cpan_recipe_string, generate_luarocks_recipe_string,
-        generate_pypi_recipe_string, generate_r_recipe_string,
-    },
     run_test,
-    selectors::SelectorConfig,
-    tool_configuration::{self, ContinueOnFailure, SkipExisting, TestStrategy},
+    tool_configuration::{ContinueOnFailure, SkipExisting, TestStrategy},
 };
 use clap::ValueEnum;
 use pyo3::prelude::*;
 use rattler_conda_types::{NamedChannelOrUrl, Platform};
 use rattler_config::config::{ConfigBase, build::PackageFormatAndCompression};
-use rattler_upload::upload;
-use rattler_upload::upload::opt::{
-    AnacondaData, ArtifactoryData, CondaForgeData, PrefixData, QuetzData,
-};
-use url::Url;
 
+mod build_types;
 mod error;
+mod jinja_config;
+mod platform_types;
+mod progress_callback;
+mod recipe_generation;
+mod render;
+mod stage0;
+mod stage1;
+mod tool_config;
+mod tracing_subscriber;
+mod upload;
+mod variant_config;
+
 use error::RattlerBuildError;
+use jinja_config::PyJinjaConfig;
 
 /// Execute async tasks in Python bindings with proper error handling
 fn run_async_task<F, R>(future: F) -> PyResult<R>
@@ -44,318 +40,16 @@ where
     Ok(rt.block_on(async { future.await.map_err(RattlerBuildError::from) })?)
 }
 
-/// Python wrapper for SelectorConfig
-#[pyclass]
-#[derive(Clone)]
-pub struct PySelectorConfig {
-    pub(crate) inner: SelectorConfig,
-}
-
-#[pymethods]
-impl PySelectorConfig {
-    #[new]
-    #[pyo3(signature = (target_platform=None, host_platform=None, build_platform=None, variant=None, experimental=None, allow_undefined=None, recipe_path=None, hash=None))]
-    #[allow(clippy::too_many_arguments)]
-    fn new(
-        py: Python<'_>,
-        target_platform: Option<String>,
-        host_platform: Option<String>,
-        build_platform: Option<String>,
-        variant: Option<HashMap<String, Py<PyAny>>>,
-        experimental: Option<bool>,
-        allow_undefined: Option<bool>,
-        recipe_path: Option<PathBuf>,
-        hash: Option<String>,
-    ) -> PyResult<Self> {
-        let target_platform = target_platform
-            .map(|p| Platform::from_str(&p))
-            .transpose()
-            .map_err(RattlerBuildError::from)?
-            .unwrap_or_else(Platform::current);
-
-        let host_platform = host_platform
-            .map(|p| Platform::from_str(&p))
-            .transpose()
-            .map_err(RattlerBuildError::from)?
-            .unwrap_or_else(Platform::current);
-
-        let build_platform = build_platform
-            .map(|p| Platform::from_str(&p))
-            .transpose()
-            .map_err(RattlerBuildError::from)?
-            .unwrap_or_else(Platform::current);
-
-        // Convert variant from Python dict to BTreeMap<NormalizedKey, Variable>
-        let variant_map = if let Some(variant_dict) = variant {
-            let mut map = BTreeMap::new();
-            for (key, value) in variant_dict {
-                let normalized_key = NormalizedKey::from(key);
-                // Convert Python object to JSON Value then to Variable
-                let json_val: serde_json::Value =
-                    pythonize::depythonize(value.bind(py)).map_err(|e| {
-                        RattlerBuildError::Variant(format!(
-                            "Failed to convert variant value: {}",
-                            e
-                        ))
-                    })?;
-                let variable = match &json_val {
-                    JsonValue::String(s) => Variable::from_string(s),
-                    JsonValue::Bool(b) => Variable::from(*b),
-                    JsonValue::Number(n) => {
-                        if let Some(i) = n.as_i64() {
-                            Variable::from(i)
-                        } else {
-                            Variable::from_string(&n.to_string())
-                        }
-                    }
-                    JsonValue::Array(arr) => {
-                        let vars: Result<Vec<Variable>, RattlerBuildError> = arr
-                            .iter()
-                            .map(|v| match v {
-                                JsonValue::String(s) => Ok(Variable::from_string(s)),
-                                JsonValue::Bool(b) => Ok(Variable::from(*b)),
-                                JsonValue::Number(n) => Ok(if let Some(i) = n.as_i64() {
-                                    Variable::from(i)
-                                } else {
-                                    Variable::from_string(&n.to_string())
-                                }),
-                                _ => Err(RattlerBuildError::Variant(
-                                    "Complex array elements not supported".to_string(),
-                                )),
-                            })
-                            .collect();
-                        Variable::from(vars?)
-                    }
-                    _ => {
-                        return Err(RattlerBuildError::Variant(
-                            "Object and null variants not supported".to_string(),
-                        )
-                        .into());
-                    }
-                };
-                map.insert(normalized_key, variable);
-            }
-            Ok::<BTreeMap<NormalizedKey, Variable>, RattlerBuildError>(map)?
-        } else {
-            BTreeMap::new()
-        };
-
-        let selector_config = SelectorConfig {
-            target_platform,
-            host_platform,
-            build_platform,
-            hash: hash.map(|h| HashInfo {
-                hash: h,
-                prefix: String::new(),
-            }),
-            variant: variant_map,
-            experimental: experimental.unwrap_or(false),
-            allow_undefined: allow_undefined.unwrap_or(false),
-            recipe_path,
-        };
-
-        Ok(PySelectorConfig {
-            inner: selector_config,
-        })
-    }
-
-    #[getter]
-    fn target_platform(&self) -> String {
-        self.inner.target_platform.to_string()
-    }
-
-    #[setter]
-    fn set_target_platform(&mut self, value: String) -> PyResult<()> {
-        let platform = Platform::from_str(&value).map_err(RattlerBuildError::from)?;
-        self.inner.target_platform = platform;
-        Ok(())
-    }
-
-    #[getter]
-    fn host_platform(&self) -> String {
-        self.inner.host_platform.to_string()
-    }
-
-    #[setter]
-    fn set_host_platform(&mut self, value: String) -> PyResult<()> {
-        let platform = Platform::from_str(&value).map_err(RattlerBuildError::from)?;
-        self.inner.host_platform = platform;
-        Ok(())
-    }
-
-    #[getter]
-    fn build_platform(&self) -> String {
-        self.inner.build_platform.to_string()
-    }
-
-    #[setter]
-    fn set_build_platform(&mut self, value: String) -> PyResult<()> {
-        let platform = Platform::from_str(&value).map_err(RattlerBuildError::from)?;
-        self.inner.build_platform = platform;
-        Ok(())
-    }
-
-    #[getter]
-    fn experimental(&self) -> bool {
-        self.inner.experimental
-    }
-
-    #[setter]
-    fn set_experimental(&mut self, value: bool) {
-        self.inner.experimental = value;
-    }
-
-    #[getter]
-    fn allow_undefined(&self) -> bool {
-        self.inner.allow_undefined
-    }
-
-    #[setter]
-    fn set_allow_undefined(&mut self, value: bool) {
-        self.inner.allow_undefined = value;
-    }
-
-    #[getter]
-    fn recipe_path(&self) -> Option<PathBuf> {
-        self.inner.recipe_path.clone()
-    }
-
-    #[setter]
-    fn set_recipe_path(&mut self, value: Option<PathBuf>) {
-        self.inner.recipe_path = value;
-    }
-
-    #[getter]
-    fn hash(&self) -> Option<String> {
-        self.inner.hash.as_ref().map(|h| h.hash.clone())
-    }
-
-    #[setter]
-    fn set_hash(&mut self, value: Option<String>) {
-        self.inner.hash = value.map(|h| HashInfo {
-            hash: h,
-            prefix: String::new(),
-        });
-    }
-
-    #[getter]
-    fn variant(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
-        let mut dict = HashMap::new();
-        for (key, value) in &self.inner.variant {
-            let json_value = serde_json::to_value(value).map_err(RattlerBuildError::from)?;
-            dict.insert(key.normalize(), json_value);
-        }
-        Ok(pythonize::pythonize(py, &dict)
-            .map(|obj| obj.into())
-            .map_err(|e| {
-                RattlerBuildError::Variant(format!("Failed to convert variant to Python: {}", e))
-            })?)
-    }
-
-    #[setter]
-    fn set_variant(&mut self, py: Python<'_>, value: HashMap<String, Py<PyAny>>) -> PyResult<()> {
-        let mut map = BTreeMap::new();
-        for (key, py_value) in value {
-            let normalized_key = NormalizedKey::from(key);
-            let json_val: serde_json::Value =
-                pythonize::depythonize(py_value.bind(py)).map_err(|e| {
-                    RattlerBuildError::Variant(format!("Failed to convert variant value: {}", e))
-                })?;
-            let variable = match &json_val {
-                JsonValue::String(s) => Variable::from_string(s),
-                JsonValue::Bool(b) => Variable::from(*b),
-                JsonValue::Number(n) => {
-                    if let Some(i) = n.as_i64() {
-                        Variable::from(i)
-                    } else {
-                        Variable::from_string(&n.to_string())
-                    }
-                }
-                JsonValue::Array(arr) => {
-                    let vars: Result<Vec<Variable>, RattlerBuildError> = arr
-                        .iter()
-                        .map(|v| match v {
-                            JsonValue::String(s) => Ok(Variable::from_string(s)),
-                            JsonValue::Bool(b) => Ok(Variable::from(*b)),
-                            JsonValue::Number(n) => Ok(if let Some(i) = n.as_i64() {
-                                Variable::from(i)
-                            } else {
-                                Variable::from_string(&n.to_string())
-                            }),
-                            _ => Err(RattlerBuildError::Variant(
-                                "Complex array elements not supported".to_string(),
-                            )),
-                        })
-                        .collect();
-                    Variable::from(vars?)
-                }
-                _ => {
-                    return Err(RattlerBuildError::Variant(
-                        "Object and null variants not supported".to_string(),
-                    )
-                    .into());
-                }
-            };
-            map.insert(normalized_key, variable);
-        }
-        self.inner.variant = map;
-        Ok(())
-    }
-}
-
 // Bind the get version function to the Python module
 #[pyfunction]
 fn get_rattler_build_version_py() -> PyResult<String> {
     Ok(get_rattler_build_version().to_string())
 }
 
-/// Generate a PyPI recipe and return the YAML as a string.
-#[pyfunction]
-#[pyo3(signature = (package, version=None, use_mapping=true))]
-fn generate_pypi_recipe_string_py(
-    package: String,
-    version: Option<String>,
-    use_mapping: bool,
-) -> PyResult<String> {
-    let opts = PyPIOpts {
-        package,
-        version,
-        write: false,
-        use_mapping,
-        tree: false,
-    };
-
-    run_async_task(generate_pypi_recipe_string(&opts))
-}
-
-/// Generate a CRAN (R) recipe and return the YAML as a string.
-#[pyfunction]
-#[pyo3(signature = (package, universe=None))]
-fn generate_r_recipe_string_py(package: String, universe: Option<String>) -> PyResult<String> {
-    run_async_task(generate_r_recipe_string(&package, universe.as_deref()))
-}
-
-/// Generate a CPAN (Perl) recipe and return the YAML as a string.
-#[pyfunction]
-#[pyo3(signature = (package, version=None))]
-fn generate_cpan_recipe_string_py(package: String, version: Option<String>) -> PyResult<String> {
-    let opts = CpanOpts {
-        package,
-        version,
-        write: false,
-        tree: false,
-    };
-
-    run_async_task(generate_cpan_recipe_string(&opts))
-}
-
-/// Generate a LuaRocks recipe and return the YAML as a string.
-#[pyfunction]
-#[pyo3(signature = (rock))]
-fn generate_luarocks_recipe_string_py(rock: String) -> PyResult<String> {
-    run_async_task(generate_luarocks_recipe_string(&rock))
-}
-
+// Legacy parse_recipe_py function - now use the stage0/stage1 Python bindings instead
+// This function is commented out as the Recipe::from_yaml API has changed
+// Use the new Stage0Recipe.from_yaml() in the stage0 module
+/*
 /// Parse a recipe YAML string and return the parsed recipe as a Python dictionary.
 #[pyfunction]
 #[pyo3(signature = (yaml_content, selector_config))]
@@ -363,29 +57,11 @@ fn parse_recipe_py(
     yaml_content: String,
     selector_config: &PySelectorConfig,
 ) -> PyResult<Py<PyAny>> {
-    match Recipe::from_yaml(yaml_content.as_str(), selector_config.inner.clone()) {
-        Ok(recipe) => {
-            let json_value = serde_json::to_value(recipe).map_err(RattlerBuildError::from)?;
-
-            Python::attach(|py| {
-                pythonize::pythonize(py, &json_value)
-                    .map(|obj| obj.into())
-                    .map_err(|e| {
-                        RattlerBuildError::RecipeParse(format!(
-                            "Failed to convert to Python: {}",
-                            e
-                        ))
-                        .into()
-                    })
-            })
-        }
-        Err(errors) => Err(RattlerBuildError::RecipeParse(format!(
-            "Recipe parsing failed: {:?}",
-            errors
-        ))
-        .into()),
-    }
+    // This function needs to be updated to work with the new stage0/stage1 API
+    // For now, use the stage0.Recipe.from_yaml() method instead
+    unimplemented!("Use stage0.Recipe.from_yaml() instead")
 }
+*/
 
 #[pyfunction]
 #[pyo3(signature = (recipes, up_to, build_platform, target_platform, host_platform, channel, variant_config, variant_overrides=None, ignore_recipe_variants=false, render_only=false, with_solve=false, keep_build=false, no_build_id=false, package_format=None, compression_threads=None, io_concurrency_limit=None, no_include_recipe=false, test=None, output_dir=None, auth_file=None, channel_priority=None, skip_existing=None, noarch_build_platform=None, allow_insecure_host=None, continue_on_failure=false, debug=false, error_prefix_in_binary=false, allow_symlinks_on_windows=false, exclude_newer=None, use_bz2=true, use_zstd=true, use_jlap=false, use_sharded=true))]
@@ -516,6 +192,278 @@ fn build_recipes_py(
     })
 }
 
+/// Build from already-rendered variants (Stage1 recipes)
+///
+/// This function takes RenderedVariant objects (from recipe.render()) and builds them
+/// directly without needing to write temporary files.
+///
+/// If tool_config is provided, it will be used instead of the individual parameters.
+#[pyfunction]
+#[pyo3(signature = (rendered_variants, tool_config=None, output_dir=None, channel=None, progress_callback=None, recipe_path=None, keep_build=false, no_build_id=false, package_format=None, compression_threads=None, io_concurrency_limit=None, no_include_recipe=false, test=None, auth_file=None, channel_priority=None, skip_existing=None, allow_insecure_host=None, continue_on_failure=false, debug=false, _error_prefix_in_binary=false, _allow_symlinks_on_windows=false, exclude_newer=None, use_bz2=true, use_zstd=true, use_jlap=false, use_sharded=true))]
+#[allow(clippy::too_many_arguments)]
+fn build_from_rendered_variants_py(
+    rendered_variants: Vec<render::PyRenderedVariant>,
+    tool_config: Option<tool_config::PyToolConfiguration>,
+    output_dir: Option<PathBuf>,
+    channel: Option<Vec<String>>,
+    progress_callback: Option<Py<PyAny>>,
+    recipe_path: Option<PathBuf>,
+    keep_build: bool,
+    no_build_id: bool,
+    package_format: Option<String>,
+    compression_threads: Option<u32>,
+    io_concurrency_limit: Option<usize>,
+    no_include_recipe: bool,
+    test: Option<String>,
+    auth_file: Option<String>,
+    channel_priority: Option<String>,
+    skip_existing: Option<String>,
+    allow_insecure_host: Option<Vec<String>>,
+    continue_on_failure: bool,
+    debug: bool,
+    _error_prefix_in_binary: bool,
+    _allow_symlinks_on_windows: bool,
+    exclude_newer: Option<chrono::DateTime<chrono::Utc>>,
+    use_bz2: bool,
+    use_zstd: bool,
+    use_jlap: bool,
+    use_sharded: bool,
+) -> PyResult<()> {
+    use ::rattler_build::{
+        console_utils::LoggingOutputHandler,
+        metadata::{BuildConfiguration, Output, PlatformWithVirtualPackages},
+        run_build_from_args,
+        system_tools::SystemTools,
+        tool_configuration::Configuration,
+        types::{BuildSummary, Directories, PackageIdentifier, PackagingSettings},
+    };
+    use rattler_build_recipe::stage1::HashInfo;
+    use rattler_build_types::NormalizedKey;
+    use rattler_solve::SolveStrategy;
+    use std::{
+        collections::BTreeMap,
+        sync::{Arc, Mutex},
+    };
+
+    // Use provided tool_config or build one from parameters
+    let tool_config = if let Some(config) = tool_config {
+        config.inner
+    } else {
+        let channel_priority = channel_priority
+            .map(|c| ChannelPriorityWrapper::from_str(&c).map(|c| c.value))
+            .transpose()
+            .map_err(|e| RattlerBuildError::ChannelPriority(e.to_string()))?;
+
+        let config = ConfigBase::<()>::default();
+        let channel_config = config.channel_config.clone();
+        let _common = CommonData::new(
+            output_dir.clone(),
+            false,
+            auth_file.map(|a| a.into()),
+            config,
+            channel_priority,
+            allow_insecure_host.clone(),
+            use_bz2,
+            use_zstd,
+            use_jlap,
+            use_sharded,
+        );
+
+        let test_strategy = test.map(|t| TestStrategy::from_str(&t, false).unwrap());
+        let skip_existing = skip_existing.map(|s| SkipExisting::from_str(&s, false).unwrap());
+
+        // Use a hidden multi-progress if Python callback is provided to suppress Rust progress bars
+        let log_handler = if progress_callback.is_some() {
+            use indicatif::MultiProgress;
+            // Create a hidden MultiProgress that doesn't render to terminal
+            let mp = MultiProgress::with_draw_target(indicatif::ProgressDrawTarget::hidden());
+            LoggingOutputHandler::default().with_multi_progress(mp)
+        } else {
+            LoggingOutputHandler::default()
+        };
+
+        Configuration::builder()
+            .with_logging_output_handler(log_handler)
+            .with_channel_config(channel_config.clone())
+            .with_compression_threads(compression_threads)
+            .with_io_concurrency_limit(io_concurrency_limit)
+            .with_keep_build(keep_build)
+            .with_test_strategy(test_strategy.unwrap_or(TestStrategy::Skip))
+            .with_zstd_repodata_enabled(use_zstd)
+            .with_bz2_repodata_enabled(use_bz2)
+            .with_sharded_repodata_enabled(use_sharded)
+            .with_jlap_enabled(use_jlap)
+            .with_skip_existing(skip_existing.unwrap_or(SkipExisting::None))
+            .with_channel_priority(channel_priority.unwrap_or_default())
+            .with_continue_on_failure(ContinueOnFailure::from(continue_on_failure))
+            .with_allow_insecure_host(allow_insecure_host)
+            .finish()
+    };
+
+    let package_format = package_format
+        .map(|p| PackageFormatAndCompression::from_str(&p))
+        .transpose()
+        .map_err(|e| RattlerBuildError::PackageFormat(e.to_string()))?;
+
+    let channels = match channel {
+        None => vec![NamedChannelOrUrl::Name("conda-forge".to_string())],
+        Some(channel) => channel
+            .iter()
+            .map(|c| {
+                NamedChannelOrUrl::from_str(c)
+                    .map_err(|e| RattlerBuildError::ChannelPriority(e.to_string()))
+                    .map_err(|e| e.into())
+            })
+            .collect::<PyResult<_>>()?,
+    };
+
+    // Convert rendered variants to Output objects
+    let output_dir = output_dir.unwrap_or_else(|| PathBuf::from("."));
+    let timestamp = chrono::Utc::now();
+    let virtual_package_override = rattler_virtual_packages::VirtualPackageOverrides::from_env();
+
+    let mut outputs = Vec::new();
+    let mut subpackages = BTreeMap::new();
+
+    // First pass: collect all subpackage identifiers
+    for rendered_variant in &rendered_variants {
+        let recipe = &rendered_variant.inner.recipe;
+        subpackages.insert(
+            recipe.package.name.clone(),
+            PackageIdentifier {
+                name: recipe.package.name.clone(),
+                version: recipe.package.version.clone(),
+                build_string: recipe
+                    .build
+                    .string
+                    .as_resolved()
+                    .ok_or_else(|| {
+                        RattlerBuildError::Other("Build string not resolved".to_string())
+                    })?
+                    .to_string(),
+            },
+        );
+    }
+
+    // If recipe_path is None, we should not include the recipe in the package
+    let effective_no_include_recipe = no_include_recipe || recipe_path.is_none();
+
+    // Create a safe fallback recipe path when None is provided
+    // We use a subdirectory in output_dir to avoid copying unrelated files
+    let safe_recipe_path = recipe_path
+        .clone()
+        .unwrap_or_else(|| output_dir.join("_no_recipe").join("recipe.yaml"));
+
+    // Second pass: create Output objects
+    for rendered_variant in rendered_variants {
+        let recipe = rendered_variant.inner.recipe;
+        let variant = rendered_variant.inner.variant;
+
+        // Extract platforms from variant or use current platform
+        let target_platform = variant
+            .get(&NormalizedKey("target_platform".to_string()))
+            .and_then(|v| v.to_string().parse::<Platform>().ok())
+            .unwrap_or_else(Platform::current);
+
+        let build_platform = variant
+            .get(&NormalizedKey("build_platform".to_string()))
+            .and_then(|v| v.to_string().parse::<Platform>().ok())
+            .unwrap_or_else(Platform::current);
+
+        let host_platform = variant
+            .get(&NormalizedKey("host_platform".to_string()))
+            .and_then(|v| v.to_string().parse::<Platform>().ok())
+            .unwrap_or_else(Platform::current);
+
+        // Convert channels to base URLs
+        let channels_urls = channels
+            .iter()
+            .map(|c| c.clone().into_base_url(&tool_config.channel_config))
+            .collect::<Result<Vec<_>, _>>()
+            .map_err(|e| RattlerBuildError::Other(format!("Channel error: {}", e)))?;
+
+        // Create hash info - use default if not available
+        let hash_info = rendered_variant
+            .inner
+            .hash_info
+            .clone()
+            .unwrap_or_else(|| HashInfo {
+                hash: String::new(),
+                prefix: String::new(),
+            });
+
+        let build_name = recipe.package.name.as_normalized().to_string();
+
+        let output = Output {
+            recipe,
+            build_configuration: BuildConfiguration {
+                target_platform,
+                host_platform: PlatformWithVirtualPackages::detect_for_platform(
+                    host_platform,
+                    &virtual_package_override,
+                )
+                .map_err(|e| {
+                    RattlerBuildError::Other(format!("Platform detection error: {}", e))
+                })?,
+                build_platform: PlatformWithVirtualPackages::detect_for_platform(
+                    build_platform,
+                    &virtual_package_override,
+                )
+                .map_err(|e| {
+                    RattlerBuildError::Other(format!("Platform detection error: {}", e))
+                })?,
+                hash: hash_info,
+                variant,
+                directories: Directories::setup(
+                    &build_name,
+                    &safe_recipe_path,
+                    &output_dir,
+                    no_build_id,
+                    &timestamp,
+                    false, // merge_build_and_host_envs - we can infer from recipe if needed
+                )
+                .map_err(|e| RattlerBuildError::Other(format!("Directory setup error: {}", e)))?,
+                channels: channels_urls.clone(),
+                channel_priority: tool_config.channel_priority,
+                solve_strategy: SolveStrategy::Highest,
+                timestamp,
+                subpackages: subpackages.clone(),
+                packaging_settings: PackagingSettings::from_args(
+                    package_format
+                        .as_ref()
+                        .map(|p| p.archive_type)
+                        .unwrap_or(rattler_conda_types::package::ArchiveType::Conda),
+                    package_format
+                        .as_ref()
+                        .map(|p| p.compression_level)
+                        .unwrap_or(
+                            rattler_conda_types::compression_level::CompressionLevel::Default,
+                        ),
+                ),
+                store_recipe: !effective_no_include_recipe,
+                force_colors: false, // Set to false for Python API
+                sandbox_config: None,
+                debug: ::rattler_build::metadata::Debug::new(debug),
+                exclude_newer,
+            },
+            finalized_dependencies: None,
+            finalized_sources: None,
+            finalized_cache_dependencies: None,
+            finalized_cache_sources: None,
+            build_summary: Arc::new(Mutex::new(BuildSummary::default())),
+            system_tools: SystemTools::default(),
+            extra_meta: None,
+        };
+
+        outputs.push(output);
+    }
+
+    // Run the build with optional tracing subscriber
+    tracing_subscriber::with_python_tracing(progress_callback, || {
+        run_async_task(async { run_build_from_args(outputs, tool_config).await })
+    })
+}
+
 #[allow(clippy::too_many_arguments)]
 #[pyfunction]
 #[pyo3(signature = (package_file, channel, compression_threads, auth_file, channel_priority, allow_insecure_host=None, debug=false, test_index=None, use_bz2=true, use_zstd=true, use_jlap=false, use_sharded=true))]
@@ -579,153 +527,41 @@ fn test_package_py(
     })
 }
 
-#[pyfunction]
-#[pyo3(signature = (package_files, url, channels, api_key, auth_file))]
-fn upload_package_to_quetz_py(
-    package_files: Vec<PathBuf>,
-    url: String,
-    channels: String,
-    api_key: Option<String>,
-    auth_file: Option<PathBuf>,
-) -> PyResult<()> {
-    let store = tool_configuration::get_auth_store(auth_file).map_err(RattlerBuildError::Auth)?;
-
-    let url = Url::parse(&url).map_err(RattlerBuildError::from)?;
-    let quetz_data = QuetzData::new(url, channels, api_key);
-
-    run_async_task(async {
-        upload::upload_package_to_quetz(&store, &package_files, quetz_data).await?;
-        Ok(())
-    })
-}
-
-#[pyfunction]
-#[pyo3(signature = (package_files, url, channels, token, auth_file))]
-fn upload_package_to_artifactory_py(
-    package_files: Vec<PathBuf>,
-    url: String,
-    channels: String,
-    token: Option<String>,
-    auth_file: Option<PathBuf>,
-) -> PyResult<()> {
-    let store = tool_configuration::get_auth_store(auth_file).map_err(RattlerBuildError::Auth)?;
-    let url = Url::parse(&url).map_err(RattlerBuildError::from)?;
-    let artifactory_data = ArtifactoryData::new(url, channels, token);
-
-    run_async_task(async {
-        upload::upload_package_to_artifactory(&store, &package_files, artifactory_data).await?;
-        Ok(())
-    })
-}
-
-#[pyfunction]
-#[pyo3(signature = (package_files, url, channel, api_key, auth_file, skip_existing, attestation_file=None,))]
-fn upload_package_to_prefix_py(
-    package_files: Vec<PathBuf>,
-    url: String,
-    channel: String,
-    api_key: Option<String>,
-    auth_file: Option<PathBuf>,
-    skip_existing: bool,
-    attestation_file: Option<PathBuf>,
-) -> PyResult<()> {
-    let store = tool_configuration::get_auth_store(auth_file).map_err(RattlerBuildError::Auth)?;
-
-    let url = Url::parse(&url).map_err(RattlerBuildError::from)?;
-    let prefix_data = PrefixData::new(url, channel, api_key, attestation_file, skip_existing);
-
-    run_async_task(async {
-        upload::upload_package_to_prefix(&store, &package_files, prefix_data).await?;
-        Ok(())
-    })
-}
-
-#[pyfunction]
-#[pyo3(signature = (package_files, owner, channel, api_key, url, force, auth_file))]
-fn upload_package_to_anaconda_py(
-    package_files: Vec<PathBuf>,
-    owner: String,
-    channel: Option<Vec<String>>,
-    api_key: Option<String>,
-    url: Option<String>,
-    force: bool,
-    auth_file: Option<PathBuf>,
-) -> PyResult<()> {
-    let store = tool_configuration::get_auth_store(auth_file).map_err(RattlerBuildError::Auth)?;
-
-    let url = url
-        .map(|u| Url::parse(&u))
-        .transpose()
-        .map_err(RattlerBuildError::from)?;
-    let anaconda_data = AnacondaData::new(owner, channel, api_key, url, force);
-
-    run_async_task(async {
-        upload::upload_package_to_anaconda(&store, &package_files, anaconda_data).await?;
-        Ok(())
-    })
-}
-
-#[pyfunction]
-#[pyo3(signature = (package_files, staging_token, feedstock, feedstock_token, staging_channel, anaconda_url, validation_endpoint, provider, dry_run))]
-#[allow(clippy::too_many_arguments)]
-fn upload_packages_to_conda_forge_py(
-    package_files: Vec<PathBuf>,
-    staging_token: String,
-    feedstock: String,
-    feedstock_token: String,
-    staging_channel: Option<String>,
-    anaconda_url: Option<String>,
-    validation_endpoint: Option<String>,
-    provider: Option<String>,
-    dry_run: bool,
-) -> PyResult<()> {
-    let anaconda_url = anaconda_url
-        .map(|u| Url::parse(&u))
-        .transpose()
-        .map_err(|e| RattlerBuildError::Other(format!("Error parsing anaconda_url: {e}")))?;
-
-    let validation_endpoint = validation_endpoint
-        .map(|u| Url::parse(&u))
-        .transpose()
-        .map_err(|e| {
-            RattlerBuildError::Other(format!("Error parsing validation_endpoint: {e}",))
-        })?;
-
-    let conda_forge_data = CondaForgeData::new(
-        staging_token,
-        feedstock,
-        feedstock_token,
-        staging_channel,
-        anaconda_url,
-        validation_endpoint,
-        provider,
-        dry_run,
-    );
-
-    run_async_task(async {
-        upload::conda_forge::upload_packages_to_conda_forge(&package_files, conda_forge_data)
-            .await?;
-        Ok(())
-    })
-}
-
 #[pymodule]
 fn rattler_build<'py>(_py: Python<'py>, m: Bound<'py, PyModule>) -> PyResult<()> {
     error::register_exceptions(_py, &m)?;
     m.add_function(wrap_pyfunction!(get_rattler_build_version_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(generate_pypi_recipe_string_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(generate_r_recipe_string_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(generate_cpan_recipe_string_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(generate_luarocks_recipe_string_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(parse_recipe_py, &m).unwrap())?;
+    m.add_function(
+        wrap_pyfunction!(recipe_generation::generate_pypi_recipe_string_py, &m).unwrap(),
+    )?;
+    m.add_function(wrap_pyfunction!(recipe_generation::generate_r_recipe_string_py, &m).unwrap())?;
+    m.add_function(
+        wrap_pyfunction!(recipe_generation::generate_cpan_recipe_string_py, &m).unwrap(),
+    )?;
+    m.add_function(
+        wrap_pyfunction!(recipe_generation::generate_luarocks_recipe_string_py, &m).unwrap(),
+    )?;
+    // parse_recipe_py is deprecated - use stage0.Recipe.from_yaml() instead
+    // m.add_function(wrap_pyfunction!(parse_recipe_py, &m).unwrap())?;
     m.add_function(wrap_pyfunction!(build_recipes_py, &m).unwrap())?;
+    m.add_function(wrap_pyfunction!(build_from_rendered_variants_py, &m).unwrap())?;
     m.add_function(wrap_pyfunction!(test_package_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(upload_package_to_quetz_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(upload_package_to_artifactory_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(upload_package_to_prefix_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(upload_package_to_anaconda_py, &m).unwrap())?;
-    m.add_function(wrap_pyfunction!(upload_packages_to_conda_forge_py, &m).unwrap())?;
-    m.add_class::<PySelectorConfig>()?;
+    m.add_function(wrap_pyfunction!(upload::upload_package_to_quetz_py, &m).unwrap())?;
+    m.add_function(wrap_pyfunction!(upload::upload_package_to_artifactory_py, &m).unwrap())?;
+    m.add_function(wrap_pyfunction!(upload::upload_package_to_prefix_py, &m).unwrap())?;
+    m.add_function(wrap_pyfunction!(upload::upload_package_to_anaconda_py, &m).unwrap())?;
+    m.add_function(wrap_pyfunction!(upload::upload_packages_to_conda_forge_py, &m).unwrap())?;
+    m.add_class::<PyJinjaConfig>()?;
+
+    // Register all submodules
+    stage0::register_stage0_module(_py, &m)?;
+    stage1::register_stage1_module(_py, &m)?;
+    variant_config::register_variant_config_module(_py, &m)?;
+    render::register_render_module(_py, &m)?;
+    tool_config::register_tool_config_module(_py, &m)?;
+    build_types::register_build_types_module(_py, &m)?;
+    platform_types::register_platform_types_module(_py, &m)?;
+    progress_callback::register_progress_types(_py, &m)?;
 
     Ok(())
 }
diff --git a/py-rattler-build/src/platform_types.rs b/py-rattler-build/src/platform_types.rs
new file mode 100644
index 000000000..836c67e2f
--- /dev/null
+++ b/py-rattler-build/src/platform_types.rs
@@ -0,0 +1,134 @@
+use pyo3::prelude::*;
+use pyo3::types::PyList;
+use rattler_build::types::PlatformWithVirtualPackages;
+use rattler_conda_types::Platform;
+
+use crate::error::RattlerBuildError;
+
+/// Python wrapper for PlatformWithVirtualPackages
+#[pyclass(name = "PlatformWithVirtualPackages")]
+#[derive(Clone)]
+pub struct PyPlatformWithVirtualPackages {
+    pub(crate) inner: PlatformWithVirtualPackages,
+}
+
+#[pymethods]
+impl PyPlatformWithVirtualPackages {
+    /// Create a new platform with virtual packages
+    #[new]
+    #[pyo3(signature = (platform=None))]
+    fn new(platform: Option<String>) -> PyResult<Self> {
+        let platform = if let Some(p) = platform {
+            p.parse::<Platform>()
+                .map_err(|e| RattlerBuildError::Other(format!("Invalid platform: {}", e)))?
+        } else {
+            Platform::current()
+        };
+
+        let inner = PlatformWithVirtualPackages::detect_for_platform(
+            platform,
+            &rattler_virtual_packages::VirtualPackageOverrides::from_env(),
+        )
+        .map_err(|e| {
+            RattlerBuildError::Other(format!("Failed to detect virtual packages: {}", e))
+        })?;
+
+        Ok(Self { inner })
+    }
+
+    /// Get the platform as a string
+    #[getter]
+    fn platform(&self) -> String {
+        self.inner.platform.to_string()
+    }
+
+    /// Get the virtual packages
+    #[getter]
+    fn virtual_packages(&self, py: Python<'_>) -> PyResult<Py<PyList>> {
+        let list = PyList::empty(py);
+        for vp in &self.inner.virtual_packages {
+            let dict = pyo3::types::PyDict::new(py);
+            dict.set_item("name", vp.name.as_source())?;
+            dict.set_item("version", vp.version.to_string())?;
+            // build_string is a String, not an Option
+            dict.set_item("build_string", &vp.build_string)?;
+            list.append(dict)?;
+        }
+        Ok(list.into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "PlatformWithVirtualPackages(platform='{}', virtual_packages_count={})",
+            self.inner.platform,
+            self.inner.virtual_packages.len()
+        )
+    }
+}
+
+/// Python wrapper for Platform enum
+#[pyclass(name = "Platform")]
+#[derive(Clone)]
+pub struct PyPlatform {
+    pub(crate) inner: Platform,
+}
+
+#[pymethods]
+impl PyPlatform {
+    /// Create a platform from a string
+    #[new]
+    fn new(platform: &str) -> PyResult<Self> {
+        let inner = platform
+            .parse::<Platform>()
+            .map_err(|e| RattlerBuildError::Other(format!("Invalid platform: {}", e)))?;
+        Ok(Self { inner })
+    }
+
+    /// Get the current platform
+    #[staticmethod]
+    fn current() -> Self {
+        Self {
+            inner: Platform::current(),
+        }
+    }
+
+    /// Check if this is a NoArch platform
+    fn is_noarch(&self) -> bool {
+        self.inner == Platform::NoArch
+    }
+
+    /// Get the platform as a string
+    fn __str__(&self) -> String {
+        self.inner.to_string()
+    }
+
+    fn __repr__(&self) -> String {
+        format!("Platform('{}')", self.inner)
+    }
+
+    /// Check equality
+    fn __eq__(&self, other: &Self) -> bool {
+        self.inner == other.inner
+    }
+
+    /// Hash for use in sets/dicts
+    fn __hash__(&self) -> u64 {
+        use std::collections::hash_map::DefaultHasher;
+        use std::hash::{Hash, Hasher};
+        let mut hasher = DefaultHasher::new();
+        format!("{:?}", self.inner).hash(&mut hasher);
+        hasher.finish()
+    }
+}
+
+/// Register the platform_types module with Python
+pub fn register_platform_types_module(
+    py: Python<'_>,
+    parent: &Bound<'_, PyModule>,
+) -> PyResult<()> {
+    let m = PyModule::new(py, "platform_types")?;
+    m.add_class::<PyPlatformWithVirtualPackages>()?;
+    m.add_class::<PyPlatform>()?;
+    parent.add_submodule(&m)?;
+    Ok(())
+}
diff --git a/py-rattler-build/src/progress_callback.rs b/py-rattler-build/src/progress_callback.rs
new file mode 100644
index 000000000..18df9f111
--- /dev/null
+++ b/py-rattler-build/src/progress_callback.rs
@@ -0,0 +1,235 @@
+use pyo3::prelude::*;
+use std::sync::Arc;
+
+/// Event types for progress reporting
+#[pyclass]
+#[derive(Clone)]
+pub struct DownloadStartEvent {
+    #[pyo3(get)]
+    pub url: String,
+    #[pyo3(get)]
+    pub total_bytes: Option<u64>,
+}
+
+#[pymethods]
+impl DownloadStartEvent {
+    fn __repr__(&self) -> String {
+        format!(
+            "DownloadStartEvent(url='{}', total_bytes={:?})",
+            self.url, self.total_bytes
+        )
+    }
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct DownloadProgressEvent {
+    #[pyo3(get)]
+    pub url: String,
+    #[pyo3(get)]
+    pub bytes_downloaded: u64,
+    #[pyo3(get)]
+    pub total_bytes: Option<u64>,
+}
+
+#[pymethods]
+impl DownloadProgressEvent {
+    fn __repr__(&self) -> String {
+        format!(
+            "DownloadProgressEvent(url='{}', bytes_downloaded={}, total_bytes={:?})",
+            self.url, self.bytes_downloaded, self.total_bytes
+        )
+    }
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct DownloadCompleteEvent {
+    #[pyo3(get)]
+    pub url: String,
+}
+
+#[pymethods]
+impl DownloadCompleteEvent {
+    fn __repr__(&self) -> String {
+        format!("DownloadCompleteEvent(url='{}')", self.url)
+    }
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct BuildStepEvent {
+    #[pyo3(get)]
+    pub step_name: String,
+    #[pyo3(get)]
+    pub message: String,
+}
+
+#[pymethods]
+impl BuildStepEvent {
+    fn __repr__(&self) -> String {
+        format!(
+            "BuildStepEvent(step_name='{}', message='{}')",
+            self.step_name, self.message
+        )
+    }
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct LogEvent {
+    #[pyo3(get)]
+    pub level: String,
+    #[pyo3(get)]
+    pub message: String,
+    #[pyo3(get)]
+    pub span: Option<String>,
+}
+
+#[pymethods]
+impl LogEvent {
+    fn __repr__(&self) -> String {
+        format!(
+            "LogEvent(level='{}', message='{}', span={:?})",
+            self.level, self.message, self.span
+        )
+    }
+}
+
+/// Python progress callback bridge
+///
+/// This struct wraps a Python callback object and provides thread-safe
+/// methods to invoke it from Rust code during the build process.
+#[derive(Clone)]
+pub struct PyProgressCallback {
+    callback: Arc<Py<PyAny>>,
+}
+
+impl PyProgressCallback {
+    /// Create a new Python progress callback wrapper
+    pub fn new(callback: Py<PyAny>) -> Self {
+        Self {
+            callback: Arc::new(callback),
+        }
+    }
+
+    /// Get the inner Arc for sharing across threads
+    pub fn inner(&self) -> Arc<Py<PyAny>> {
+        Arc::clone(&self.callback)
+    }
+
+    /// Get a clone of this callback wrapper
+    pub fn clone_callback(&self) -> Arc<Self> {
+        Arc::new(self.clone())
+    }
+
+    /// Call the on_download_start callback
+    pub fn on_download_start(&self, url: &str, total_bytes: Option<u64>) {
+        if let Err(e) = Python::attach(|py| {
+            let event = DownloadStartEvent {
+                url: url.to_string(),
+                total_bytes,
+            };
+            let event_obj = Py::new(py, event)?;
+
+            self.callback
+                .bind(py)
+                .call_method1("on_download_start", (event_obj,))?;
+            Ok::<(), PyErr>(())
+        }) {
+            // Log error but don't fail the build
+            eprintln!("Error in Python progress callback on_download_start: {}", e);
+        }
+    }
+
+    /// Call the on_download_progress callback
+    pub fn on_download_progress(&self, url: &str, bytes_downloaded: u64, total_bytes: Option<u64>) {
+        if let Err(e) = Python::attach(|py| {
+            let event = DownloadProgressEvent {
+                url: url.to_string(),
+                bytes_downloaded,
+                total_bytes,
+            };
+            let event_obj = Py::new(py, event)?;
+
+            self.callback
+                .bind(py)
+                .call_method1("on_download_progress", (event_obj,))?;
+            Ok::<(), PyErr>(())
+        }) {
+            eprintln!(
+                "Error in Python progress callback on_download_progress: {}",
+                e
+            );
+        }
+    }
+
+    /// Call the on_download_complete callback
+    pub fn on_download_complete(&self, url: &str) {
+        if let Err(e) = Python::attach(|py| {
+            let event = DownloadCompleteEvent {
+                url: url.to_string(),
+            };
+            let event_obj = Py::new(py, event)?;
+
+            self.callback
+                .bind(py)
+                .call_method1("on_download_complete", (event_obj,))?;
+            Ok::<(), PyErr>(())
+        }) {
+            eprintln!(
+                "Error in Python progress callback on_download_complete: {}",
+                e
+            );
+        }
+    }
+
+    /// Call the on_build_step callback
+    pub fn on_build_step(&self, step_name: &str, message: &str) {
+        if let Err(e) = Python::attach(|py| {
+            let event = BuildStepEvent {
+                step_name: step_name.to_string(),
+                message: message.to_string(),
+            };
+            let event_obj = Py::new(py, event)?;
+
+            self.callback
+                .bind(py)
+                .call_method1("on_build_step", (event_obj,))?;
+            Ok::<(), PyErr>(())
+        }) {
+            eprintln!("Error in Python progress callback on_build_step: {}", e);
+        }
+    }
+
+    /// Call the on_log callback
+    pub fn on_log(&self, level: &str, message: &str, span: Option<&str>) {
+        if let Err(e) = Python::attach(|py| {
+            let event = LogEvent {
+                level: level.to_string(),
+                message: message.to_string(),
+                span: span.map(|s| s.to_string()),
+            };
+            let event_obj = Py::new(py, event)?;
+
+            self.callback
+                .bind(py)
+                .call_method1("on_log", (event_obj,))?;
+            Ok::<(), PyErr>(())
+        }) {
+            eprintln!("Error in Python progress callback on_log: {}", e);
+        }
+    }
+}
+
+/// Register progress callback types with Python
+pub fn register_progress_types(py: Python<'_>, parent: &Bound<'_, PyModule>) -> PyResult<()> {
+    let m = PyModule::new(py, "progress")?;
+    m.add_class::<DownloadStartEvent>()?;
+    m.add_class::<DownloadProgressEvent>()?;
+    m.add_class::<DownloadCompleteEvent>()?;
+    m.add_class::<BuildStepEvent>()?;
+    m.add_class::<LogEvent>()?;
+    parent.add_submodule(&m)?;
+    Ok(())
+}
diff --git a/py-rattler-build/src/recipe_generation.rs b/py-rattler-build/src/recipe_generation.rs
new file mode 100644
index 000000000..437165976
--- /dev/null
+++ b/py-rattler-build/src/recipe_generation.rs
@@ -0,0 +1,57 @@
+use ::rattler_build::recipe_generator::{
+    CpanOpts, PyPIOpts, generate_cpan_recipe_string, generate_luarocks_recipe_string,
+    generate_pypi_recipe_string, generate_r_recipe_string,
+};
+use pyo3::prelude::*;
+
+use crate::run_async_task;
+
+/// Generate a PyPI recipe and return the YAML as a string.
+#[pyfunction]
+#[pyo3(signature = (package, version=None, use_mapping=true))]
+pub fn generate_pypi_recipe_string_py(
+    package: String,
+    version: Option<String>,
+    use_mapping: bool,
+) -> PyResult<String> {
+    let opts = PyPIOpts {
+        package,
+        version,
+        write: false,
+        use_mapping,
+        tree: false,
+    };
+
+    run_async_task(generate_pypi_recipe_string(&opts))
+}
+
+/// Generate a CRAN (R) recipe and return the YAML as a string.
+#[pyfunction]
+#[pyo3(signature = (package, universe=None))]
+pub fn generate_r_recipe_string_py(package: String, universe: Option<String>) -> PyResult<String> {
+    run_async_task(generate_r_recipe_string(&package, universe.as_deref()))
+}
+
+/// Generate a CPAN (Perl) recipe and return the YAML as a string.
+#[pyfunction]
+#[pyo3(signature = (package, version=None))]
+pub fn generate_cpan_recipe_string_py(
+    package: String,
+    version: Option<String>,
+) -> PyResult<String> {
+    let opts = CpanOpts {
+        package,
+        version,
+        write: false,
+        tree: false,
+    };
+
+    run_async_task(generate_cpan_recipe_string(&opts))
+}
+
+/// Generate a LuaRocks recipe and return the YAML as a string.
+#[pyfunction]
+#[pyo3(signature = (rock))]
+pub fn generate_luarocks_recipe_string_py(rock: String) -> PyResult<String> {
+    run_async_task(generate_luarocks_recipe_string(&rock))
+}
diff --git a/py-rattler-build/src/render.rs b/py-rattler-build/src/render.rs
new file mode 100644
index 000000000..ee4a1bfd0
--- /dev/null
+++ b/py-rattler-build/src/render.rs
@@ -0,0 +1,396 @@
+use std::path::PathBuf;
+
+use indexmap::IndexMap;
+use pyo3::prelude::*;
+use pyo3::types::PyDict;
+use rattler_build_jinja::Variable;
+use rattler_build_recipe::variant_render::{
+    RenderConfig as RustRenderConfig, RenderedVariant as RustRenderedVariant,
+    render_recipe_with_variant_config,
+};
+use rattler_conda_types::Platform;
+
+use crate::error::RattlerBuildError;
+use crate::stage0::PyStage0Recipe;
+use crate::stage1::PyStage1Recipe;
+use crate::variant_config::PyVariantConfig;
+
+/// Configuration for rendering recipes with variants
+#[pyclass(name = "RenderConfig")]
+#[derive(Clone)]
+pub struct PyRenderConfig {
+    pub(crate) inner: RustRenderConfig,
+}
+
+#[pymethods]
+impl PyRenderConfig {
+    /// Create a new render configuration with default settings
+    #[new]
+    #[pyo3(signature = (target_platform=None, build_platform=None, host_platform=None, experimental=false, recipe_path=None))]
+    fn new(
+        target_platform: Option<String>,
+        build_platform: Option<String>,
+        host_platform: Option<String>,
+        experimental: bool,
+        recipe_path: Option<PathBuf>,
+    ) -> PyResult<Self> {
+        let target_platform = target_platform
+            .map(|p| {
+                p.parse::<Platform>().map_err(|e| {
+                    RattlerBuildError::Other(format!("Invalid target_platform: {}", e))
+                })
+            })
+            .transpose()?
+            .unwrap_or_else(Platform::current);
+
+        let build_platform = build_platform
+            .map(|p| {
+                p.parse::<Platform>()
+                    .map_err(|e| RattlerBuildError::Other(format!("Invalid build_platform: {}", e)))
+            })
+            .transpose()?
+            .unwrap_or_else(Platform::current);
+
+        let host_platform = host_platform
+            .map(|p| {
+                p.parse::<Platform>()
+                    .map_err(|e| RattlerBuildError::Other(format!("Invalid host_platform: {}", e)))
+            })
+            .transpose()?
+            .unwrap_or_else(Platform::current);
+
+        Ok(Self {
+            inner: RustRenderConfig {
+                extra_context: IndexMap::new(),
+                experimental,
+                recipe_path,
+                target_platform,
+                build_platform,
+                host_platform,
+            },
+        })
+    }
+
+    /// Add an extra context variable for Jinja rendering
+    ///
+    /// # Arguments
+    /// * `key` - The variable name
+    /// * `value` - The value (can be string, bool, int, float, or list)
+    fn set_context(&mut self, key: String, value: Bound<'_, PyAny>) -> PyResult<()> {
+        let variable = python_to_variable(value)?;
+        self.inner.extra_context.insert(key, variable);
+        Ok(())
+    }
+
+    /// Get an extra context variable
+    fn get_context(&self, py: Python<'_>, key: &str) -> PyResult<Option<Py<PyAny>>> {
+        if let Some(var) = self.inner.extra_context.get(key) {
+            Ok(Some(variable_to_python(py, var)?))
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Get all extra context variables as a dictionary
+    fn get_all_context(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
+        let dict = PyDict::new(py);
+        for (key, value) in &self.inner.extra_context {
+            dict.set_item(key, variable_to_python(py, value)?)?;
+        }
+        Ok(dict.into())
+    }
+
+    /// Set the target platform
+    fn set_target_platform(&mut self, platform: String) -> PyResult<()> {
+        self.inner.target_platform = platform
+            .parse()
+            .map_err(|e| RattlerBuildError::Other(format!("Invalid platform: {}", e)))?;
+        Ok(())
+    }
+
+    /// Set the build platform
+    fn set_build_platform(&mut self, platform: String) -> PyResult<()> {
+        self.inner.build_platform = platform
+            .parse()
+            .map_err(|e| RattlerBuildError::Other(format!("Invalid platform: {}", e)))?;
+        Ok(())
+    }
+
+    /// Set the host platform
+    fn set_host_platform(&mut self, platform: String) -> PyResult<()> {
+        self.inner.host_platform = platform
+            .parse()
+            .map_err(|e| RattlerBuildError::Other(format!("Invalid platform: {}", e)))?;
+        Ok(())
+    }
+
+    /// Set whether experimental features are enabled
+    fn set_experimental(&mut self, experimental: bool) {
+        self.inner.experimental = experimental;
+    }
+
+    /// Set the recipe path for relative path resolution
+    fn set_recipe_path(&mut self, recipe_path: Option<PathBuf>) {
+        self.inner.recipe_path = recipe_path;
+    }
+
+    /// Get the target platform as a string
+    fn target_platform(&self) -> String {
+        self.inner.target_platform.to_string()
+    }
+
+    /// Get the build platform as a string
+    fn build_platform(&self) -> String {
+        self.inner.build_platform.to_string()
+    }
+
+    /// Get the host platform as a string
+    fn host_platform(&self) -> String {
+        self.inner.host_platform.to_string()
+    }
+
+    /// Get whether experimental features are enabled
+    fn experimental(&self) -> bool {
+        self.inner.experimental
+    }
+
+    /// Get the recipe path
+    fn recipe_path(&self) -> Option<PathBuf> {
+        self.inner.recipe_path.clone()
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "RenderConfig(target_platform='{}', build_platform='{}', host_platform='{}', experimental={})",
+            self.inner.target_platform,
+            self.inner.build_platform,
+            self.inner.host_platform,
+            self.inner.experimental
+        )
+    }
+}
+
+/// Hash information for a rendered variant
+#[pyclass(name = "HashInfo")]
+#[derive(Clone, Debug)]
+pub struct PyHashInfo {
+    #[pyo3(get)]
+    pub hash: String,
+    #[pyo3(get)]
+    pub prefix: String,
+}
+
+#[pymethods]
+impl PyHashInfo {
+    fn __repr__(&self) -> String {
+        format!("HashInfo(hash='{}', prefix='{}')", self.hash, self.prefix)
+    }
+}
+
+/// Information about a pin_subpackage dependency
+#[pyclass(name = "PinSubpackageInfo")]
+#[derive(Clone, Debug)]
+pub struct PyPinSubpackageInfo {
+    #[pyo3(get)]
+    pub name: String,
+    #[pyo3(get)]
+    pub version: String,
+    #[pyo3(get)]
+    pub build_string: Option<String>,
+    #[pyo3(get)]
+    pub exact: bool,
+}
+
+#[pymethods]
+impl PyPinSubpackageInfo {
+    fn __repr__(&self) -> String {
+        format!(
+            "PinSubpackageInfo(name='{}', version='{}', build_string={:?}, exact={})",
+            self.name, self.version, self.build_string, self.exact
+        )
+    }
+}
+
+/// Result of rendering a recipe with a specific variant combination
+#[pyclass(name = "RenderedVariant")]
+#[derive(Clone)]
+pub struct PyRenderedVariant {
+    pub(crate) inner: RustRenderedVariant,
+}
+
+#[pymethods]
+impl PyRenderedVariant {
+    /// Get the variant combination used (variable name -> value)
+    fn variant(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
+        let dict = PyDict::new(py);
+        for (key, value) in &self.inner.variant {
+            dict.set_item(key.0.as_str(), variable_to_python(py, value)?)?;
+        }
+        Ok(dict.into())
+    }
+
+    /// Get the rendered stage1 recipe
+    fn recipe(&self) -> PyStage1Recipe {
+        PyStage1Recipe {
+            inner: self.inner.recipe.clone(),
+        }
+    }
+
+    /// Get hash info if available
+    fn hash_info(&self) -> Option<PyHashInfo> {
+        self.inner.hash_info.as_ref().map(|hash_info| PyHashInfo {
+            hash: hash_info.hash.clone(),
+            prefix: hash_info.prefix.clone(),
+        })
+    }
+
+    /// Get pin_subpackage information
+    fn pin_subpackages(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
+        let dict = PyDict::new(py);
+        for (key, pin_info) in &self.inner.pin_subpackages {
+            let py_pin_info = PyPinSubpackageInfo {
+                name: pin_info.name.as_normalized().to_string(),
+                version: pin_info.version.to_string(),
+                build_string: pin_info.build_string.clone(),
+                exact: pin_info.exact,
+            };
+            dict.set_item(key.0.as_str(), py_pin_info)?;
+        }
+        Ok(dict.into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "RenderedVariant(package='{}', version='{}', build_string='{}')",
+            self.inner.recipe.package.name.as_normalized(),
+            self.inner.recipe.package.version,
+            self.inner
+                .recipe
+                .build
+                .string
+                .as_resolved()
+                .map(|s| s.to_string())
+                .unwrap_or_else(|| "None".to_string())
+        )
+    }
+}
+
+/// Render a Stage0 recipe with a variant configuration into Stage1 recipes
+///
+/// # Arguments
+/// * `recipe` - The Stage0 recipe to render (Recipe, SingleOutputRecipe, or MultiOutputRecipe)
+/// * `variant_config` - The variant configuration
+/// * `render_config` - Optional render configuration (defaults to current platform)
+///
+/// # Returns
+/// A list of RenderedVariant objects, one for each variant combination
+#[pyfunction]
+#[pyo3(signature = (recipe, variant_config, render_config=None))]
+pub fn render_recipe(
+    recipe: &Bound<'_, PyAny>,
+    variant_config: &PyVariantConfig,
+    render_config: Option<PyRenderConfig>,
+) -> PyResult<Vec<PyRenderedVariant>> {
+    let config = render_config.unwrap_or_else(|| PyRenderConfig {
+        inner: RustRenderConfig::default(),
+    });
+
+    // Try to extract the inner stage0 recipe
+    let stage0_recipe = if let Ok(r) = recipe.extract::<PyRef<PyStage0Recipe>>() {
+        r.inner.clone()
+    } else {
+        return Err(RattlerBuildError::Other("Expected a Stage0 Recipe".to_string()).into());
+    };
+
+    // Call the Rust render function
+    let rendered =
+        render_recipe_with_variant_config(&stage0_recipe, &variant_config.inner, config.inner)
+            .map_err(|e| RattlerBuildError::Other(format!("Render error: {:?}", e)))?;
+
+    // Convert to Python objects
+    Ok(rendered
+        .into_iter()
+        .map(|r| PyRenderedVariant { inner: r })
+        .collect())
+}
+
+/// Helper function to convert Python values to Variable
+fn python_to_variable(value: Bound<'_, PyAny>) -> PyResult<Variable> {
+    if let Ok(b) = value.extract::<bool>() {
+        Ok(Variable::from(b))
+    } else if let Ok(i) = value.extract::<i64>() {
+        Ok(Variable::from(i))
+    } else if let Ok(s) = value.extract::<String>() {
+        Ok(Variable::from(s))
+    } else if let Ok(list) = value.downcast::<pyo3::types::PyList>() {
+        let items: PyResult<Vec<Variable>> =
+            list.iter().map(|item| python_to_variable(item)).collect();
+        Ok(Variable::from(items?))
+    } else {
+        Ok(Variable::from(value.to_string()))
+    }
+}
+
+/// Helper function to convert Variable to Python values
+fn variable_to_python(py: Python<'_>, var: &Variable) -> PyResult<Py<PyAny>> {
+    // Try to extract as bool first (must be before number check)
+    if let Some(b) = var.as_bool() {
+        let json_val = serde_json::Value::Bool(b);
+        return pythonize::pythonize(py, &json_val)
+            .map(|obj| obj.into())
+            .map_err(|e| {
+                RattlerBuildError::Other(format!("Failed to convert bool: {}", e)).into()
+            });
+    }
+
+    // Try to extract as integer
+    if let Some(i) = var.as_i64() {
+        let json_val = serde_json::Value::Number(i.into());
+        return pythonize::pythonize(py, &json_val)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::Other(format!("Failed to convert int: {}", e)).into());
+    }
+
+    // Try to extract as string
+    if let Some(s) = var.as_str() {
+        let json_val = serde_json::Value::String(s.to_string());
+        return pythonize::pythonize(py, &json_val)
+            .map(|obj| obj.into())
+            .map_err(|e| {
+                RattlerBuildError::Other(format!("Failed to convert string: {}", e)).into()
+            });
+    }
+
+    // Try to extract as list/sequence
+    if var.is_sequence() {
+        let mut vec = Vec::new();
+        if let Ok(iter) = var.try_iter() {
+            for item in iter {
+                let item_var = Variable::from(item);
+                let py_item = variable_to_python(py, &item_var)?;
+                vec.push(py_item);
+            }
+            let list = pyo3::types::PyList::new(py, &vec)?;
+            return Ok(list.unbind().into());
+        }
+    }
+
+    // Fallback to string representation
+    let s = var.to_string();
+    let json_val = serde_json::Value::String(s);
+    pythonize::pythonize(py, &json_val)
+        .map(|obj| obj.into())
+        .map_err(|e| RattlerBuildError::Other(format!("Failed to convert value: {}", e)).into())
+}
+
+/// Register the render module with Python
+pub fn register_render_module(py: Python<'_>, parent: &Bound<'_, PyModule>) -> PyResult<()> {
+    let m = PyModule::new(py, "render")?;
+    m.add_class::<PyRenderConfig>()?;
+    m.add_class::<PyRenderedVariant>()?;
+    m.add_class::<PyHashInfo>()?;
+    m.add_class::<PyPinSubpackageInfo>()?;
+    m.add_function(wrap_pyfunction!(render_recipe, &m)?)?;
+    parent.add_submodule(&m)?;
+    Ok(())
+}
diff --git a/py-rattler-build/src/stage0.rs b/py-rattler-build/src/stage0.rs
new file mode 100644
index 000000000..659216917
--- /dev/null
+++ b/py-rattler-build/src/stage0.rs
@@ -0,0 +1,713 @@
+// Python bindings for rattler-build stage0 types (parsed recipe)
+
+use crate::error::RattlerBuildError;
+use pyo3::types::PyDict;
+use pyo3::{IntoPyObjectExt, prelude::*};
+use rattler_build_recipe::stage0;
+
+/// Stage0 Recipe - The parsed recipe before evaluation
+///
+/// This is a union type that wraps either SingleOutputRecipe or MultiOutputRecipe.
+/// Most users should use `from_yaml()` which returns the specific type directly.
+#[pyclass(name = "Stage0Recipe")]
+#[derive(Clone)]
+pub struct PyStage0Recipe {
+    pub(crate) inner: stage0::Recipe,
+}
+
+#[pymethods]
+impl PyStage0Recipe {
+    /// Parse a recipe from YAML string
+    #[staticmethod]
+    fn from_yaml(yaml: &str) -> PyResult<Self> {
+        let recipe = stage0::parse_recipe_or_multi_from_source(yaml)
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{:?}", e)))?;
+        Ok(PyStage0Recipe { inner: recipe })
+    }
+
+    /// Create a recipe from a Python dictionary
+    #[staticmethod]
+    fn from_dict(dict: &Bound<'_, PyAny>) -> PyResult<Self> {
+        // Convert Python dict to JSON value via pythonize
+        let json_value: serde_json::Value = pythonize::depythonize(dict).map_err(|e| {
+            RattlerBuildError::RecipeParse(format!("Failed to convert Python dict to JSON: {}", e))
+        })?;
+
+        // Convert to YAML string using the JSON value's serde repr
+        // This is a simple approach: serialize to JSON and parse as YAML
+        let json_string = serde_json::to_string(&json_value).map_err(|e| {
+            RattlerBuildError::RecipeParse(format!("Failed to serialize to JSON: {}", e))
+        })?;
+
+        // Parse as YAML (YAML is a superset of JSON, so this works)
+        let recipe = stage0::parse_recipe_or_multi_from_source(&json_string)
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{:?}", e)))?;
+
+        Ok(PyStage0Recipe { inner: recipe })
+    }
+
+    /// Check if this is a single output recipe
+    fn is_single_output(&self) -> bool {
+        matches!(self.inner, stage0::Recipe::SingleOutput(_))
+    }
+
+    /// Check if this is a multi output recipe
+    fn is_multi_output(&self) -> bool {
+        matches!(self.inner, stage0::Recipe::MultiOutput(_))
+    }
+
+    /// Get the recipe as a single output (returns None if multi-output)
+    fn as_single_output(&self) -> Option<PySingleOutputRecipe> {
+        match &self.inner {
+            stage0::Recipe::SingleOutput(single) => Some(PySingleOutputRecipe {
+                inner: single.as_ref().clone(),
+            }),
+            _ => None,
+        }
+    }
+
+    /// Get the recipe as a multi output (returns None if single-output)
+    fn as_multi_output(&self) -> Option<PyMultiOutputRecipe> {
+        match &self.inner {
+            stage0::Recipe::MultiOutput(multi) => Some(PyMultiOutputRecipe {
+                inner: multi.as_ref().clone(),
+            }),
+            _ => None,
+        }
+    }
+
+    /// Get the package information
+    /// For single-output recipes, returns the package directly.
+    /// For multi-output recipes, returns None (use .recipe.package on the multi-output recipe instead).
+    #[getter]
+    fn package(&self) -> Option<PyStage0Package> {
+        match &self.inner {
+            stage0::Recipe::SingleOutput(single) => Some(PyStage0Package {
+                inner: single.package.clone(),
+            }),
+            _ => None,
+        }
+    }
+
+    /// Get the build configuration
+    #[getter]
+    fn build(&self) -> PyStage0Build {
+        match &self.inner {
+            stage0::Recipe::SingleOutput(single) => PyStage0Build {
+                inner: single.build.clone(),
+            },
+            stage0::Recipe::MultiOutput(multi) => PyStage0Build {
+                inner: multi.build.clone(),
+            },
+        }
+    }
+
+    /// Get the requirements
+    /// For single-output recipes, returns the requirements directly.
+    /// For multi-output recipes, returns None (requirements are per-output).
+    #[getter]
+    fn requirements(&self) -> Option<PyStage0Requirements> {
+        match &self.inner {
+            stage0::Recipe::SingleOutput(single) => Some(PyStage0Requirements {
+                inner: single.requirements.clone(),
+            }),
+            _ => None,
+        }
+    }
+
+    /// Get the about metadata
+    #[getter]
+    fn about(&self) -> PyStage0About {
+        match &self.inner {
+            stage0::Recipe::SingleOutput(single) => PyStage0About {
+                inner: single.about.clone(),
+            },
+            stage0::Recipe::MultiOutput(multi) => PyStage0About {
+                inner: multi.about.clone(),
+            },
+        }
+    }
+
+    /// Get the context dictionary
+    #[getter]
+    fn context(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
+        let context_map = match &self.inner {
+            stage0::Recipe::SingleOutput(single) => &single.context,
+            stage0::Recipe::MultiOutput(multi) => &multi.context,
+        };
+
+        let dict = PyDict::new(py);
+        for (key, value) in context_map {
+            let json_value = serde_json::to_value(value).map_err(RattlerBuildError::from)?;
+            let py_value = pythonize::pythonize(py, &json_value)
+                .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+            dict.set_item(key, py_value)?;
+        }
+        Ok(dict.into())
+    }
+
+    /// Convert to Python dictionary representation
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| {
+                RattlerBuildError::RecipeParse(format!("Failed to convert to Python: {}", e)).into()
+            })
+    }
+
+    fn __repr__(&self) -> String {
+        match &self.inner {
+            stage0::Recipe::SingleOutput(_) => "Stage0Recipe(type='single-output')".to_string(),
+            stage0::Recipe::MultiOutput(_) => "Stage0Recipe(type='multi-output')".to_string(),
+        }
+    }
+}
+
+/// Stage0 Single Output Recipe
+#[pyclass(name = "SingleOutputRecipe")]
+#[derive(Clone)]
+pub struct PySingleOutputRecipe {
+    pub(crate) inner: stage0::SingleOutputRecipe,
+}
+
+#[pymethods]
+impl PySingleOutputRecipe {
+    #[getter]
+    fn schema_version(&self) -> Option<u32> {
+        self.inner.schema_version
+    }
+
+    #[getter]
+    fn context(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
+        let dict = PyDict::new(py);
+        for (key, value) in &self.inner.context {
+            let json_value = serde_json::to_value(value).map_err(RattlerBuildError::from)?;
+            let py_value = pythonize::pythonize(py, &json_value)
+                .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+            dict.set_item(key, py_value)?;
+        }
+        Ok(dict.into())
+    }
+
+    #[getter]
+    fn package(&self) -> PyStage0Package {
+        PyStage0Package {
+            inner: self.inner.package.clone(),
+        }
+    }
+
+    #[getter]
+    fn build(&self) -> PyStage0Build {
+        PyStage0Build {
+            inner: self.inner.build.clone(),
+        }
+    }
+
+    #[getter]
+    fn requirements(&self) -> PyStage0Requirements {
+        PyStage0Requirements {
+            inner: self.inner.requirements.clone(),
+        }
+    }
+
+    #[getter]
+    fn about(&self) -> PyStage0About {
+        PyStage0About {
+            inner: self.inner.about.clone(),
+        }
+    }
+
+    /// Convert to Python dictionary
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "SingleOutputRecipe(name='{}', version='{}')",
+            serde_json::to_value(&self.inner.package.name)
+                .and_then(serde_json::from_value::<String>)
+                .unwrap_or_default(),
+            serde_json::to_value(&self.inner.package.version)
+                .and_then(serde_json::from_value::<String>)
+                .unwrap_or_default()
+        )
+    }
+}
+
+/// Stage0 Multi Output Recipe
+#[pyclass(name = "MultiOutputRecipe")]
+#[derive(Clone)]
+pub struct PyMultiOutputRecipe {
+    pub(crate) inner: stage0::MultiOutputRecipe,
+}
+
+#[pymethods]
+impl PyMultiOutputRecipe {
+    #[getter]
+    fn schema_version(&self) -> Option<u32> {
+        self.inner.schema_version
+    }
+
+    #[getter]
+    fn context(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
+        let dict = PyDict::new(py);
+        for (key, value) in &self.inner.context {
+            let json_value = serde_json::to_value(value).map_err(RattlerBuildError::from)?;
+            let py_value = pythonize::pythonize(py, &json_value)
+                .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+            dict.set_item(key, py_value)?;
+        }
+        Ok(dict.into())
+    }
+
+    #[getter]
+    fn recipe(&self) -> PyStage0RecipeMetadata {
+        PyStage0RecipeMetadata {
+            inner: self.inner.recipe.clone(),
+        }
+    }
+
+    #[getter]
+    fn build(&self) -> PyStage0Build {
+        PyStage0Build {
+            inner: self.inner.build.clone(),
+        }
+    }
+
+    #[getter]
+    fn about(&self) -> PyStage0About {
+        PyStage0About {
+            inner: self.inner.about.clone(),
+        }
+    }
+
+    #[getter]
+    fn outputs(&self, py: Python<'_>) -> PyResult<Vec<Py<PyAny>>> {
+        let mut result = Vec::new();
+        for output in &self.inner.outputs {
+            match output {
+                stage0::Output::Package(pkg) => {
+                    let py_output = PyStage0PackageOutput {
+                        inner: pkg.as_ref().clone(),
+                    };
+                    result.push(py_output.into_py_any(py)?);
+                }
+                stage0::Output::Staging(staging) => {
+                    let py_staging = PyStage0StagingOutput {
+                        inner: *staging.clone(),
+                    };
+                    result.push(py_staging.into_py_any(py)?);
+                }
+            }
+        }
+        Ok(result)
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!("MultiOutputRecipe(outputs={})", self.inner.outputs.len())
+    }
+}
+
+/// Stage0 Package (full package with name and version)
+#[pyclass(name = "Stage0Package")]
+#[derive(Clone)]
+pub struct PyStage0Package {
+    pub(crate) inner: stage0::Package,
+}
+
+#[pymethods]
+impl PyStage0Package {
+    /// Get the package name (may be a template string like "${{ name }}")
+    #[getter]
+    fn name(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner.name).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    /// Get the package version (may be a template string like "${{ version }}")
+    #[getter]
+    fn version(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value =
+            serde_json::to_value(&self.inner.version).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+}
+
+/// Stage0 Package metadata (package with optional version for multi-output recipes)
+#[pyclass(name = "Stage0PackageMetadata")]
+#[derive(Clone)]
+pub struct PyStage0PackageMetadata {
+    pub(crate) inner: stage0::PackageMetadata,
+}
+
+#[pymethods]
+impl PyStage0PackageMetadata {
+    /// Get the package name (may be a template string like "${{ name }}")
+    #[getter]
+    fn name(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner.name).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    /// Get the package version (may be a template string like "${{ version }}", or None if inherited)
+    #[getter]
+    fn version(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.version {
+            Some(version) => {
+                let json_value = serde_json::to_value(version).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+}
+
+/// Stage0 Recipe metadata (for multi-output recipes)
+#[pyclass(name = "Stage0RecipeMetadata")]
+#[derive(Clone)]
+pub struct PyStage0RecipeMetadata {
+    pub(crate) inner: stage0::RecipeMetadata,
+}
+
+#[pymethods]
+impl PyStage0RecipeMetadata {
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+}
+
+/// Stage0 Build configuration
+#[pyclass(name = "Stage0Build")]
+#[derive(Clone)]
+pub struct PyStage0Build {
+    pub(crate) inner: stage0::Build,
+}
+
+#[pymethods]
+impl PyStage0Build {
+    /// Get the build number (may be a template)
+    #[getter]
+    fn number(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value =
+            serde_json::to_value(&self.inner.number).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    /// Get the build string (may be a template or None for auto-generated)
+    #[getter]
+    fn string(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.string {
+            Some(string) => {
+                let json_value = serde_json::to_value(string).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    /// Get the build script configuration
+    #[getter]
+    fn script(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value =
+            serde_json::to_value(&self.inner.script).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    /// Get the noarch type (may be a template or None)
+    #[getter]
+    fn noarch(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.noarch {
+            Some(noarch) => {
+                let json_value = serde_json::to_value(noarch).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+}
+
+/// Stage0 Requirements
+#[pyclass(name = "Stage0Requirements")]
+#[derive(Clone)]
+pub struct PyStage0Requirements {
+    pub(crate) inner: stage0::Requirements,
+}
+
+#[pymethods]
+impl PyStage0Requirements {
+    /// Get build-time requirements (list of matchspecs or templates)
+    #[getter]
+    fn build(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value =
+            serde_json::to_value(&self.inner.build).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    /// Get host-time requirements (list of matchspecs or templates)
+    #[getter]
+    fn host(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner.host).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    /// Get run-time requirements (list of matchspecs or templates)
+    #[getter]
+    fn run(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner.run).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    /// Get run-time constraints (list of matchspecs or templates)
+    #[getter]
+    fn run_constraints(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value =
+            serde_json::to_value(&self.inner.run_constraints).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+}
+
+/// Stage0 About metadata
+#[pyclass(name = "Stage0About")]
+#[derive(Clone)]
+pub struct PyStage0About {
+    pub(crate) inner: stage0::About,
+}
+
+#[pymethods]
+impl PyStage0About {
+    /// Get the homepage URL (may be a template or None)
+    #[getter]
+    fn homepage(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.homepage {
+            Some(homepage) => {
+                let json_value = serde_json::to_value(homepage).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    /// Get the license (may be a template or None)
+    #[getter]
+    fn license(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.license {
+            Some(license) => {
+                let json_value = serde_json::to_value(license).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    /// Get the license family (deprecated, may be a template or None)
+    #[getter]
+    fn license_family(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.license_family {
+            Some(license_family) => {
+                let json_value =
+                    serde_json::to_value(license_family).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    /// Get the summary (may be a template or None)
+    #[getter]
+    fn summary(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.summary {
+            Some(summary) => {
+                let json_value = serde_json::to_value(summary).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    /// Get the description (may be a template or None)
+    #[getter]
+    fn description(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.description {
+            Some(description) => {
+                let json_value =
+                    serde_json::to_value(description).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    /// Get the documentation URL (may be a template or None)
+    #[getter]
+    fn documentation(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.documentation {
+            Some(documentation) => {
+                let json_value =
+                    serde_json::to_value(documentation).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    /// Get the repository URL (may be a template or None)
+    #[getter]
+    fn repository(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        match &self.inner.repository {
+            Some(repository) => {
+                let json_value =
+                    serde_json::to_value(repository).map_err(RattlerBuildError::from)?;
+                let py_value = pythonize::pythonize(py, &json_value)
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+                Ok(Some(py_value.into()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+}
+
+/// Stage0 Package Output
+#[pyclass(name = "Stage0PackageOutput")]
+#[derive(Clone)]
+pub struct PyStage0PackageOutput {
+    pub(crate) inner: stage0::PackageOutput,
+}
+
+#[pymethods]
+impl PyStage0PackageOutput {
+    #[getter]
+    fn package(&self) -> PyStage0PackageMetadata {
+        PyStage0PackageMetadata {
+            inner: self.inner.package.clone(),
+        }
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+}
+
+/// Stage0 Staging Output
+#[pyclass(name = "Stage0StagingOutput")]
+#[derive(Clone)]
+pub struct PyStage0StagingOutput {
+    pub(crate) inner: stage0::StagingOutput,
+}
+
+#[pymethods]
+impl PyStage0StagingOutput {
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+}
+
+pub fn register_stage0_module(py: Python<'_>, parent_module: &Bound<'_, PyModule>) -> PyResult<()> {
+    let stage0_module = PyModule::new(py, "stage0")?;
+
+    stage0_module.add_class::<PyStage0Recipe>()?;
+    stage0_module.add_class::<PySingleOutputRecipe>()?;
+    stage0_module.add_class::<PyMultiOutputRecipe>()?;
+    stage0_module.add_class::<PyStage0Package>()?;
+    stage0_module.add_class::<PyStage0PackageMetadata>()?;
+    stage0_module.add_class::<PyStage0RecipeMetadata>()?;
+    stage0_module.add_class::<PyStage0Build>()?;
+    stage0_module.add_class::<PyStage0Requirements>()?;
+    stage0_module.add_class::<PyStage0About>()?;
+    stage0_module.add_class::<PyStage0PackageOutput>()?;
+    stage0_module.add_class::<PyStage0StagingOutput>()?;
+
+    parent_module.add_submodule(&stage0_module)?;
+    Ok(())
+}
diff --git a/py-rattler-build/src/stage1.rs b/py-rattler-build/src/stage1.rs
new file mode 100644
index 000000000..a94a0d173
--- /dev/null
+++ b/py-rattler-build/src/stage1.rs
@@ -0,0 +1,407 @@
+// Python bindings for rattler-build stage1 types (evaluated recipe)
+
+use crate::error::RattlerBuildError;
+use pyo3::prelude::*;
+use pyo3::types::PyDict;
+use rattler_build_recipe::stage1;
+
+/// Stage1 Recipe - The fully evaluated recipe ready for building
+#[pyclass(name = "Stage1Recipe")]
+#[derive(Clone)]
+pub struct PyStage1Recipe {
+    pub(crate) inner: stage1::Recipe,
+}
+
+#[pymethods]
+impl PyStage1Recipe {
+    #[getter]
+    fn package(&self) -> PyStage1Package {
+        PyStage1Package {
+            inner: self.inner.package.clone(),
+        }
+    }
+
+    #[getter]
+    fn build(&self) -> PyStage1Build {
+        PyStage1Build {
+            inner: self.inner.build.clone(),
+        }
+    }
+
+    #[getter]
+    fn requirements(&self) -> PyStage1Requirements {
+        PyStage1Requirements {
+            inner: self.inner.requirements.clone(),
+        }
+    }
+
+    #[getter]
+    fn about(&self) -> PyStage1About {
+        PyStage1About {
+            inner: self.inner.about.clone(),
+        }
+    }
+
+    #[getter]
+    fn context(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
+        let dict = PyDict::new(py);
+        for (key, value) in &self.inner.context {
+            let json_value = serde_json::to_value(value).map_err(RattlerBuildError::from)?;
+            let py_value = pythonize::pythonize(py, &json_value)
+                .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+            dict.set_item(key, py_value)?;
+        }
+        Ok(dict.into())
+    }
+
+    #[getter]
+    fn used_variant(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
+        let dict = PyDict::new(py);
+        for (key, value) in &self.inner.used_variant {
+            let json_value = serde_json::to_value(value).map_err(RattlerBuildError::from)?;
+            let py_value = pythonize::pythonize(py, &json_value)
+                .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?;
+            dict.set_item(key.normalize(), py_value)?;
+        }
+        Ok(dict.into())
+    }
+
+    #[getter]
+    fn sources(&self) -> Vec<PyStage1Source> {
+        self.inner
+            .source
+            .iter()
+            .map(|s| PyStage1Source { inner: s.clone() })
+            .collect()
+    }
+
+    #[getter]
+    fn staging_caches(&self) -> Vec<PyStage1StagingCache> {
+        self.inner
+            .staging_caches
+            .iter()
+            .map(|s| PyStage1StagingCache { inner: s.clone() })
+            .collect()
+    }
+
+    #[getter]
+    fn inherits_from(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        if let Some(ref inherits) = self.inner.inherits_from {
+            let json_value = serde_json::to_value(inherits).map_err(RattlerBuildError::from)?;
+            Ok(Some(
+                pythonize::pythonize(py, &json_value)
+                    .map(|obj| obj.into())
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?,
+            ))
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Convert to Python dictionary
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "Stage1Recipe(package='{}', version='{}')",
+            self.inner.package.name.as_normalized(),
+            self.inner.package.version
+        )
+    }
+}
+
+/// Stage1 Package metadata
+#[pyclass(name = "Stage1Package")]
+#[derive(Clone)]
+pub struct PyStage1Package {
+    pub(crate) inner: stage1::Package,
+}
+
+#[pymethods]
+impl PyStage1Package {
+    #[getter]
+    fn name(&self) -> String {
+        self.inner.name.as_normalized().to_string()
+    }
+
+    #[getter]
+    fn version(&self) -> String {
+        self.inner.version.to_string()
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "Stage1Package(name='{}', version='{}')",
+            self.inner.name.as_normalized(),
+            self.inner.version
+        )
+    }
+}
+
+/// Stage1 Build configuration
+#[pyclass(name = "Stage1Build")]
+#[derive(Clone)]
+pub struct PyStage1Build {
+    pub(crate) inner: stage1::Build,
+}
+
+#[pymethods]
+impl PyStage1Build {
+    #[getter]
+    fn number(&self) -> u64 {
+        self.inner.number
+    }
+
+    #[getter]
+    fn string(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value =
+            serde_json::to_value(&self.inner.string).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    #[getter]
+    fn script(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value =
+            serde_json::to_value(&self.inner.script).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    #[getter]
+    fn noarch(&self, py: Python<'_>) -> PyResult<Option<Py<PyAny>>> {
+        if let Some(ref noarch) = self.inner.noarch {
+            let json_value = serde_json::to_value(noarch).map_err(RattlerBuildError::from)?;
+            Ok(Some(
+                pythonize::pythonize(py, &json_value)
+                    .map(|obj| obj.into())
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)))?,
+            ))
+        } else {
+            Ok(None)
+        }
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!("Stage1Build(number={})", self.inner.number)
+    }
+}
+
+/// Stage1 Requirements
+#[pyclass(name = "Stage1Requirements")]
+#[derive(Clone)]
+pub struct PyStage1Requirements {
+    pub(crate) inner: stage1::Requirements,
+}
+
+#[pymethods]
+impl PyStage1Requirements {
+    #[getter]
+    fn build(&self, py: Python<'_>) -> PyResult<Vec<Py<PyAny>>> {
+        self.inner
+            .build
+            .iter()
+            .map(|dep| {
+                let json_value = serde_json::to_value(dep).map_err(RattlerBuildError::from)?;
+                pythonize::pythonize(py, &json_value)
+                    .map(|obj| obj.into())
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+            })
+            .collect()
+    }
+
+    #[getter]
+    fn host(&self, py: Python<'_>) -> PyResult<Vec<Py<PyAny>>> {
+        self.inner
+            .host
+            .iter()
+            .map(|dep| {
+                let json_value = serde_json::to_value(dep).map_err(RattlerBuildError::from)?;
+                pythonize::pythonize(py, &json_value)
+                    .map(|obj| obj.into())
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+            })
+            .collect()
+    }
+
+    #[getter]
+    fn run(&self, py: Python<'_>) -> PyResult<Vec<Py<PyAny>>> {
+        self.inner
+            .run
+            .iter()
+            .map(|dep| {
+                let json_value = serde_json::to_value(dep).map_err(RattlerBuildError::from)?;
+                pythonize::pythonize(py, &json_value)
+                    .map(|obj| obj.into())
+                    .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+            })
+            .collect()
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "Stage1Requirements(build={}, host={}, run={})",
+            self.inner.build.len(),
+            self.inner.host.len(),
+            self.inner.run.len()
+        )
+    }
+}
+
+/// Stage1 About metadata
+#[pyclass(name = "Stage1About")]
+#[derive(Clone)]
+pub struct PyStage1About {
+    pub(crate) inner: stage1::About,
+}
+
+#[pymethods]
+impl PyStage1About {
+    #[getter]
+    fn homepage(&self) -> Option<String> {
+        self.inner.homepage.as_ref().map(|u| u.to_string())
+    }
+
+    #[getter]
+    fn repository(&self) -> Option<String> {
+        self.inner.repository.as_ref().map(|u| u.to_string())
+    }
+
+    #[getter]
+    fn documentation(&self) -> Option<String> {
+        self.inner.documentation.as_ref().map(|u| u.to_string())
+    }
+
+    #[getter]
+    fn license(&self) -> Option<String> {
+        self.inner
+            .license
+            .as_ref()
+            .map(|l| l.0.as_ref().to_string())
+    }
+
+    #[getter]
+    fn summary(&self) -> Option<String> {
+        self.inner.summary.clone()
+    }
+
+    #[getter]
+    fn description(&self) -> Option<String> {
+        self.inner.description.clone()
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "Stage1About(license={:?}, summary={:?})",
+            self.license(),
+            self.summary()
+        )
+    }
+}
+
+/// Stage1 Source
+#[pyclass(name = "Stage1Source")]
+#[derive(Clone)]
+pub struct PyStage1Source {
+    pub(crate) inner: stage1::Source,
+}
+
+#[pymethods]
+impl PyStage1Source {
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+}
+
+/// Stage1 Staging Cache
+#[pyclass(name = "Stage1StagingCache")]
+#[derive(Clone)]
+pub struct PyStage1StagingCache {
+    pub(crate) inner: stage1::StagingCache,
+}
+
+#[pymethods]
+impl PyStage1StagingCache {
+    #[getter]
+    fn name(&self) -> String {
+        self.inner.name.clone()
+    }
+
+    #[getter]
+    fn build(&self) -> PyStage1Build {
+        PyStage1Build {
+            inner: self.inner.build.clone(),
+        }
+    }
+
+    #[getter]
+    fn requirements(&self) -> PyStage1Requirements {
+        PyStage1Requirements {
+            inner: self.inner.requirements.clone(),
+        }
+    }
+
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyAny>> {
+        let json_value = serde_json::to_value(&self.inner).map_err(RattlerBuildError::from)?;
+        pythonize::pythonize(py, &json_value)
+            .map(|obj| obj.into())
+            .map_err(|e| RattlerBuildError::RecipeParse(format!("{}", e)).into())
+    }
+
+    fn __repr__(&self) -> String {
+        format!("Stage1StagingCache(name='{}')", self.inner.name)
+    }
+}
+
+pub fn register_stage1_module(py: Python<'_>, parent_module: &Bound<'_, PyModule>) -> PyResult<()> {
+    let stage1_module = PyModule::new(py, "stage1")?;
+
+    stage1_module.add_class::<PyStage1Recipe>()?;
+    stage1_module.add_class::<PyStage1Package>()?;
+    stage1_module.add_class::<PyStage1Build>()?;
+    stage1_module.add_class::<PyStage1Requirements>()?;
+    stage1_module.add_class::<PyStage1About>()?;
+    stage1_module.add_class::<PyStage1Source>()?;
+    stage1_module.add_class::<PyStage1StagingCache>()?;
+
+    parent_module.add_submodule(&stage1_module)?;
+    Ok(())
+}
diff --git a/py-rattler-build/src/tool_config.rs b/py-rattler-build/src/tool_config.rs
new file mode 100644
index 000000000..13457a6ea
--- /dev/null
+++ b/py-rattler-build/src/tool_config.rs
@@ -0,0 +1,237 @@
+use clap::ValueEnum;
+use pyo3::prelude::*;
+use rattler_build::tool_configuration::{
+    Configuration, ContinueOnFailure, SkipExisting, TestStrategy,
+};
+use rattler_conda_types::Platform;
+use rattler_solve::ChannelPriority;
+
+use crate::error::RattlerBuildError;
+
+/// Python wrapper for ToolConfiguration
+#[pyclass(name = "ToolConfiguration")]
+#[derive(Clone)]
+pub struct PyToolConfiguration {
+    pub(crate) inner: Configuration,
+}
+
+#[pymethods]
+impl PyToolConfiguration {
+    /// Create a new tool configuration with default settings
+    #[new]
+    #[pyo3(signature = (
+        keep_build=false,
+        compression_threads=None,
+        io_concurrency_limit=None,
+        test_strategy=None,
+        skip_existing=None,
+        continue_on_failure=false,
+        noarch_build_platform=None,
+        channel_priority=None,
+        allow_insecure_host=None,
+        error_prefix_in_binary=false,
+        allow_symlinks_on_windows=false,
+        use_zstd=true,
+        use_bz2=true,
+        use_sharded=true,
+        use_jlap=false
+    ))]
+    #[allow(clippy::too_many_arguments)]
+    fn new(
+        keep_build: bool,
+        compression_threads: Option<u32>,
+        io_concurrency_limit: Option<usize>,
+        test_strategy: Option<String>,
+        skip_existing: Option<String>,
+        continue_on_failure: bool,
+        noarch_build_platform: Option<String>,
+        channel_priority: Option<String>,
+        allow_insecure_host: Option<Vec<String>>,
+        error_prefix_in_binary: bool,
+        allow_symlinks_on_windows: bool,
+        use_zstd: bool,
+        use_bz2: bool,
+        use_sharded: bool,
+        use_jlap: bool,
+    ) -> PyResult<Self> {
+        let channel_priority = channel_priority
+            .map(|c| match c.to_lowercase().as_str() {
+                "strict" => Ok(ChannelPriority::Strict),
+                "disabled" => Ok(ChannelPriority::Disabled),
+                _ => Err(RattlerBuildError::Other(format!(
+                    "Invalid channel priority: {}. Must be 'strict' or 'disabled'",
+                    c
+                ))),
+            })
+            .transpose()?
+            .unwrap_or(ChannelPriority::Strict);
+
+        let test_strategy = test_strategy
+            .map(|t| {
+                TestStrategy::from_str(&t, false)
+                    .map_err(|e| RattlerBuildError::Other(format!("Invalid test strategy: {}", e)))
+            })
+            .transpose()?
+            .unwrap_or(TestStrategy::Skip);
+
+        let skip_existing = skip_existing
+            .map(|s| {
+                SkipExisting::from_str(&s, false)
+                    .map_err(|e| RattlerBuildError::Other(format!("Invalid skip existing: {}", e)))
+            })
+            .transpose()?
+            .unwrap_or(SkipExisting::None);
+
+        let noarch_build_platform = noarch_build_platform
+            .map(|p| {
+                p.parse::<Platform>()
+                    .map_err(|e| RattlerBuildError::Other(format!("Invalid platform: {}", e)))
+            })
+            .transpose()?;
+
+        let config = rattler_config::config::ConfigBase::<()>::default();
+
+        let mut builder = Configuration::builder()
+            .with_keep_build(keep_build)
+            .with_test_strategy(test_strategy)
+            .with_skip_existing(skip_existing)
+            .with_continue_on_failure(ContinueOnFailure::from(continue_on_failure))
+            .with_channel_priority(channel_priority)
+            .with_error_prefix_in_binary(error_prefix_in_binary)
+            .with_allow_symlinks_on_windows(allow_symlinks_on_windows)
+            .with_zstd_repodata_enabled(use_zstd)
+            .with_bz2_repodata_enabled(use_bz2)
+            .with_sharded_repodata_enabled(use_sharded)
+            .with_jlap_enabled(use_jlap)
+            .with_channel_config(config.channel_config);
+
+        if let Some(threads) = compression_threads {
+            builder = builder.with_compression_threads(Some(threads));
+        }
+
+        if let Some(limit) = io_concurrency_limit {
+            builder = builder.with_io_concurrency_limit(Some(limit));
+        }
+
+        if let Some(platform) = noarch_build_platform {
+            builder = builder.with_noarch_build_platform(Some(platform));
+        }
+
+        if let Some(hosts) = allow_insecure_host {
+            builder = builder.with_allow_insecure_host(Some(hosts));
+        }
+
+        Ok(Self {
+            inner: builder.finish(),
+        })
+    }
+
+    /// Whether to keep the build directory after the build is done
+    #[getter]
+    fn keep_build(&self) -> bool {
+        self.inner.no_clean
+    }
+
+    /// Set whether to keep the build directory
+    #[setter]
+    fn set_keep_build(&mut self, value: bool) {
+        self.inner.no_clean = value;
+    }
+
+    /// The test strategy to use
+    #[getter]
+    fn test_strategy(&self) -> String {
+        format!("{:?}", self.inner.test_strategy)
+    }
+
+    /// Whether to skip existing packages
+    #[getter]
+    fn skip_existing(&self) -> String {
+        format!("{:?}", self.inner.skip_existing)
+    }
+
+    /// Whether to continue building on failure
+    #[getter]
+    fn continue_on_failure(&self) -> bool {
+        matches!(self.inner.continue_on_failure, ContinueOnFailure::Yes)
+    }
+
+    /// The channel priority to use in solving
+    #[getter]
+    fn channel_priority(&self) -> String {
+        format!("{:?}", self.inner.channel_priority)
+    }
+
+    /// Whether to use zstd compression
+    #[getter]
+    fn use_zstd(&self) -> bool {
+        self.inner.use_zstd
+    }
+
+    /// Whether to use bzip2 compression
+    #[getter]
+    fn use_bz2(&self) -> bool {
+        self.inner.use_bz2
+    }
+
+    /// Whether to use sharded repodata
+    #[getter]
+    fn use_sharded(&self) -> bool {
+        self.inner.use_sharded
+    }
+
+    /// Whether to use JLAP
+    #[getter]
+    fn use_jlap(&self) -> bool {
+        self.inner.use_jlap
+    }
+
+    /// Compression threads
+    #[getter]
+    fn compression_threads(&self) -> Option<u32> {
+        self.inner.compression_threads
+    }
+
+    /// IO concurrency limit
+    #[getter]
+    fn io_concurrency_limit(&self) -> Option<usize> {
+        self.inner.io_concurrency_limit
+    }
+
+    /// List of hosts for which SSL certificate verification should be skipped
+    #[getter]
+    fn allow_insecure_host(&self) -> Option<Vec<String>> {
+        self.inner.allow_insecure_host.clone()
+    }
+
+    /// Whether to error if the host prefix is detected in binary files
+    #[getter]
+    fn error_prefix_in_binary(&self) -> bool {
+        self.inner.error_prefix_in_binary
+    }
+
+    /// Whether to allow symlinks in packages on Windows
+    #[getter]
+    fn allow_symlinks_on_windows(&self) -> bool {
+        self.inner.allow_symlinks_on_windows
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "ToolConfiguration(keep_build={}, test_strategy={:?}, skip_existing={:?}, continue_on_failure={}, channel_priority={:?})",
+            self.inner.no_clean,
+            self.inner.test_strategy,
+            self.inner.skip_existing,
+            matches!(self.inner.continue_on_failure, ContinueOnFailure::Yes),
+            self.inner.channel_priority
+        )
+    }
+}
+
+/// Register the tool_config module with Python
+pub fn register_tool_config_module(py: Python<'_>, parent: &Bound<'_, PyModule>) -> PyResult<()> {
+    let m = PyModule::new(py, "tool_config")?;
+    m.add_class::<PyToolConfiguration>()?;
+    parent.add_submodule(&m)?;
+    Ok(())
+}
diff --git a/py-rattler-build/src/tracing_subscriber.rs b/py-rattler-build/src/tracing_subscriber.rs
new file mode 100644
index 000000000..8d23ab060
--- /dev/null
+++ b/py-rattler-build/src/tracing_subscriber.rs
@@ -0,0 +1,92 @@
+use pyo3::prelude::*;
+use tracing::{Level, Subscriber};
+use tracing_subscriber::Layer;
+use tracing_subscriber::layer::{Context, SubscriberExt};
+
+use crate::progress_callback::PyProgressCallback;
+
+/// A tracing layer that forwards log events to a Python progress callback
+pub struct PythonTracingLayer {
+    callback: PyProgressCallback,
+}
+
+impl PythonTracingLayer {
+    pub fn new(callback: PyProgressCallback) -> Self {
+        Self { callback }
+    }
+}
+
+impl<S> Layer<S> for PythonTracingLayer
+where
+    S: Subscriber + for<'lookup> tracing_subscriber::registry::LookupSpan<'lookup>,
+{
+    fn on_event(&self, event: &tracing::Event<'_>, _ctx: Context<'_, S>) {
+        let metadata = event.metadata();
+        let level = match *metadata.level() {
+            Level::ERROR => "error",
+            Level::WARN => "warn",
+            Level::INFO => "info",
+            Level::DEBUG => "debug",
+            Level::TRACE => "trace",
+        };
+
+        // Extract the message from the event
+        let mut visitor = MessageVisitor::default();
+        event.record(&mut visitor);
+
+        // Extract span name if available
+        let span = _ctx.event_span(event).map(|s| s.name().to_string());
+
+        // Forward to Python callback
+        self.callback
+            .on_log(level, &visitor.message, span.as_deref());
+    }
+}
+
+/// Visitor to extract the message from a tracing event
+#[derive(Default)]
+struct MessageVisitor {
+    message: String,
+}
+
+impl tracing::field::Visit for MessageVisitor {
+    fn record_debug(&mut self, field: &tracing::field::Field, value: &dyn std::fmt::Debug) {
+        if field.name() == "message" {
+            self.message = format!("{:?}", value);
+            // Remove quotes if present
+            if self.message.starts_with('"') && self.message.ends_with('"') {
+                self.message = self.message[1..self.message.len() - 1].to_string();
+            }
+        }
+    }
+
+    fn record_str(&mut self, field: &tracing::field::Field, value: &str) {
+        if field.name() == "message" {
+            self.message = value.to_string();
+        }
+    }
+}
+
+/// Install a Python tracing subscriber for the duration of the build
+pub fn with_python_tracing<F, R>(callback: Option<Py<PyAny>>, f: F) -> R
+where
+    F: FnOnce() -> R,
+{
+    if let Some(py_callback) = callback {
+        let callback = PyProgressCallback::new(py_callback);
+        let layer = PythonTracingLayer::new(callback);
+
+        // Create a subscriber with the Python layer and filter
+        // Only capture info/warn/error, not debug/trace which are too noisy
+        use tracing_subscriber::filter::LevelFilter;
+        let subscriber = tracing_subscriber::registry()
+            .with(layer)
+            .with(LevelFilter::INFO);
+
+        // Set this subscriber for the duration of the closure
+        tracing::subscriber::with_default(subscriber, f)
+    } else {
+        // No callback provided, just run the function
+        f()
+    }
+}
diff --git a/py-rattler-build/src/upload.rs b/py-rattler-build/src/upload.rs
new file mode 100644
index 000000000..eb6e59255
--- /dev/null
+++ b/py-rattler-build/src/upload.rs
@@ -0,0 +1,141 @@
+use std::path::PathBuf;
+
+use pyo3::prelude::*;
+use rattler_build::tool_configuration;
+use rattler_upload::upload;
+use rattler_upload::upload::opt::{
+    AnacondaData, ArtifactoryData, CondaForgeData, PrefixData, QuetzData,
+};
+use url::Url;
+
+use crate::{error::RattlerBuildError, run_async_task};
+
+#[pyfunction]
+#[pyo3(signature = (package_files, url, channels, api_key, auth_file))]
+pub fn upload_package_to_quetz_py(
+    package_files: Vec<PathBuf>,
+    url: String,
+    channels: String,
+    api_key: Option<String>,
+    auth_file: Option<PathBuf>,
+) -> PyResult<()> {
+    let store = tool_configuration::get_auth_store(auth_file).map_err(RattlerBuildError::Auth)?;
+
+    let url = Url::parse(&url).map_err(RattlerBuildError::from)?;
+    let quetz_data = QuetzData::new(url, channels, api_key);
+
+    run_async_task(async {
+        upload::upload_package_to_quetz(&store, &package_files, quetz_data).await?;
+        Ok(())
+    })
+}
+
+#[pyfunction]
+#[pyo3(signature = (package_files, url, channels, token, auth_file))]
+pub fn upload_package_to_artifactory_py(
+    package_files: Vec<PathBuf>,
+    url: String,
+    channels: String,
+    token: Option<String>,
+    auth_file: Option<PathBuf>,
+) -> PyResult<()> {
+    let store = tool_configuration::get_auth_store(auth_file).map_err(RattlerBuildError::Auth)?;
+    let url = Url::parse(&url).map_err(RattlerBuildError::from)?;
+    let artifactory_data = ArtifactoryData::new(url, channels, token);
+
+    run_async_task(async {
+        upload::upload_package_to_artifactory(&store, &package_files, artifactory_data).await?;
+        Ok(())
+    })
+}
+
+#[pyfunction]
+#[pyo3(signature = (package_files, url, channel, api_key, auth_file, skip_existing, attestation_file=None,))]
+pub fn upload_package_to_prefix_py(
+    package_files: Vec<PathBuf>,
+    url: String,
+    channel: String,
+    api_key: Option<String>,
+    auth_file: Option<PathBuf>,
+    skip_existing: bool,
+    attestation_file: Option<PathBuf>,
+) -> PyResult<()> {
+    let store = tool_configuration::get_auth_store(auth_file).map_err(RattlerBuildError::Auth)?;
+
+    let url = Url::parse(&url).map_err(RattlerBuildError::from)?;
+    let prefix_data = PrefixData::new(url, channel, api_key, attestation_file, skip_existing);
+
+    run_async_task(async {
+        upload::upload_package_to_prefix(&store, &package_files, prefix_data).await?;
+        Ok(())
+    })
+}
+
+#[pyfunction]
+#[pyo3(signature = (package_files, owner, channel, api_key, url, force, auth_file))]
+pub fn upload_package_to_anaconda_py(
+    package_files: Vec<PathBuf>,
+    owner: String,
+    channel: Option<Vec<String>>,
+    api_key: Option<String>,
+    url: Option<String>,
+    force: bool,
+    auth_file: Option<PathBuf>,
+) -> PyResult<()> {
+    let store = tool_configuration::get_auth_store(auth_file).map_err(RattlerBuildError::Auth)?;
+
+    let url = url
+        .map(|u| Url::parse(&u))
+        .transpose()
+        .map_err(RattlerBuildError::from)?;
+    let anaconda_data = AnacondaData::new(owner, channel, api_key, url, force);
+
+    run_async_task(async {
+        upload::upload_package_to_anaconda(&store, &package_files, anaconda_data).await?;
+        Ok(())
+    })
+}
+
+#[pyfunction]
+#[pyo3(signature = (package_files, staging_token, feedstock, feedstock_token, staging_channel, anaconda_url, validation_endpoint, provider, dry_run))]
+#[allow(clippy::too_many_arguments)]
+pub fn upload_packages_to_conda_forge_py(
+    package_files: Vec<PathBuf>,
+    staging_token: String,
+    feedstock: String,
+    feedstock_token: String,
+    staging_channel: Option<String>,
+    anaconda_url: Option<String>,
+    validation_endpoint: Option<String>,
+    provider: Option<String>,
+    dry_run: bool,
+) -> PyResult<()> {
+    let anaconda_url = anaconda_url
+        .map(|u| Url::parse(&u))
+        .transpose()
+        .map_err(|e| RattlerBuildError::Other(format!("Error parsing anaconda_url: {e}")))?;
+
+    let validation_endpoint = validation_endpoint
+        .map(|u| Url::parse(&u))
+        .transpose()
+        .map_err(|e| {
+            RattlerBuildError::Other(format!("Error parsing validation_endpoint: {e}",))
+        })?;
+
+    let conda_forge_data = CondaForgeData::new(
+        staging_token,
+        feedstock,
+        feedstock_token,
+        staging_channel,
+        anaconda_url,
+        validation_endpoint,
+        provider,
+        dry_run,
+    );
+
+    run_async_task(async {
+        upload::conda_forge::upload_packages_to_conda_forge(&package_files, conda_forge_data)
+            .await?;
+        Ok(())
+    })
+}
diff --git a/py-rattler-build/src/variant_config.rs b/py-rattler-build/src/variant_config.rs
new file mode 100644
index 000000000..efdff9f4d
--- /dev/null
+++ b/py-rattler-build/src/variant_config.rs
@@ -0,0 +1,226 @@
+// Python bindings for VariantConfig
+
+use crate::error::RattlerBuildError;
+use crate::jinja_config::PyJinjaConfig;
+use pyo3::prelude::*;
+use pyo3::types::PyDict;
+use rattler_build_jinja::Variable;
+use rattler_build_types::NormalizedKey;
+use rattler_build_variant_config::config::VariantConfig;
+use std::path::PathBuf;
+
+/// Python wrapper for VariantConfig
+#[pyclass(name = "VariantConfig")]
+#[derive(Clone)]
+pub struct PyVariantConfig {
+    pub(crate) inner: VariantConfig,
+}
+
+#[pymethods]
+impl PyVariantConfig {
+    /// Create a new empty VariantConfig
+    #[new]
+    fn new() -> Self {
+        PyVariantConfig {
+            inner: VariantConfig::default(),
+        }
+    }
+
+    /// Load VariantConfig from a YAML file (variants.yaml format)
+    #[staticmethod]
+    fn from_file(path: PathBuf) -> PyResult<Self> {
+        let config = VariantConfig::from_file(&path)
+            .map_err(|e| RattlerBuildError::Variant(format!("{:?}", e)))?;
+        Ok(PyVariantConfig { inner: config })
+    }
+
+    /// Load VariantConfig from a YAML file with a JinjaConfig context (variants.yaml format)
+    ///
+    /// This allows evaluation of conditionals and templates in the variant file.
+    /// The `jinja_config` provides platform information and other context needed for evaluation.
+    #[staticmethod]
+    fn from_file_with_context(path: PathBuf, jinja_config: &PyJinjaConfig) -> PyResult<Self> {
+        let config = VariantConfig::from_file_with_context(&path, &jinja_config.inner)
+            .map_err(|e| RattlerBuildError::Variant(format!("{:?}", e)))?;
+        Ok(PyVariantConfig { inner: config })
+    }
+
+    /// Load VariantConfig from a conda_build_config.yaml file
+    ///
+    /// This supports the legacy conda-build format with `# [selector]` syntax.
+    /// Selectors are evaluated using the provided JinjaConfig.
+    #[staticmethod]
+    fn from_conda_build_config(path: PathBuf, jinja_config: &PyJinjaConfig) -> PyResult<Self> {
+        let config = rattler_build_variant_config::conda_build_config::load_conda_build_config(
+            &path,
+            &jinja_config.inner,
+        )
+        .map_err(|e| RattlerBuildError::Variant(format!("{:?}", e)))?;
+        Ok(PyVariantConfig { inner: config })
+    }
+
+    /// Load VariantConfig from a YAML string (variants.yaml format)
+    #[staticmethod]
+    fn from_yaml(yaml: &str) -> PyResult<Self> {
+        let config = VariantConfig::from_yaml_str(yaml)
+            .map_err(|e| RattlerBuildError::Variant(format!("{:?}", e)))?;
+        Ok(PyVariantConfig { inner: config })
+    }
+
+    /// Load VariantConfig from a YAML string with a JinjaConfig context (variants.yaml format)
+    ///
+    /// This allows evaluation of conditionals and templates in the variant YAML.
+    /// The `jinja_config` provides platform information and other context needed for evaluation.
+    #[staticmethod]
+    fn from_yaml_with_context(yaml: &str, jinja_config: &PyJinjaConfig) -> PyResult<Self> {
+        let config = VariantConfig::from_yaml_str_with_context(yaml, &jinja_config.inner)
+            .map_err(|e| RattlerBuildError::Variant(format!("{:?}", e)))?;
+        Ok(PyVariantConfig { inner: config })
+    }
+
+    /// Get all variant keys
+    fn keys(&self) -> Vec<String> {
+        self.inner.keys().map(|k| k.normalize()).collect()
+    }
+
+    /// Get zip_keys - groups of keys that should be zipped together
+    #[getter]
+    fn zip_keys(&self) -> Option<Vec<Vec<String>>> {
+        self.inner.zip_keys.as_ref().map(|zip_keys| {
+            zip_keys
+                .iter()
+                .map(|group| group.iter().map(|k| k.normalize()).collect())
+                .collect()
+        })
+    }
+
+    /// Set zip_keys - groups of keys that should be zipped together
+    #[setter]
+    fn set_zip_keys(&mut self, zip_keys: Option<Vec<Vec<String>>>) {
+        self.inner.zip_keys = zip_keys.map(|zk| {
+            zk.into_iter()
+                .map(|group| group.into_iter().map(NormalizedKey::from).collect())
+                .collect()
+        });
+    }
+
+    /// Get values for a specific variant key
+    fn get_values(&self, key: &str, py: Python<'_>) -> PyResult<Option<Vec<Py<PyAny>>>> {
+        let normalized_key = NormalizedKey::from(key);
+        if let Some(values) = self.inner.get(&normalized_key) {
+            let py_values = values
+                .iter()
+                .map(|v| {
+                    let json_value = serde_json::to_value(v).map_err(RattlerBuildError::from)?;
+                    pythonize::pythonize(py, &json_value)
+                        .map(|obj| obj.into())
+                        .map_err(|e| RattlerBuildError::Variant(format!("{}", e)).into())
+                })
+                .collect::<PyResult<Vec<_>>>()?;
+            Ok(Some(py_values))
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Set values for a variant key
+    fn set_values(
+        &mut self,
+        key: &str,
+        values: Vec<Bound<'_, PyAny>>,
+        _py: Python<'_>,
+    ) -> PyResult<()> {
+        let normalized_key = NormalizedKey::from(key);
+        let variables: Vec<Variable> = values
+            .iter()
+            .map(|v| {
+                let json_value: serde_json::Value = pythonize::depythonize(v)
+                    .map_err(|e| RattlerBuildError::Variant(format!("{}", e)))?;
+
+                match &json_value {
+                    serde_json::Value::String(s) => Ok(Variable::from_string(s)),
+                    serde_json::Value::Bool(b) => Ok(Variable::from(*b)),
+                    serde_json::Value::Number(n) => {
+                        if let Some(i) = n.as_i64() {
+                            Ok(Variable::from(i))
+                        } else {
+                            Ok(Variable::from_string(&n.to_string()))
+                        }
+                    }
+                    _ => {
+                        Err(RattlerBuildError::Variant("Unsupported value type".to_string()).into())
+                    }
+                }
+            })
+            .collect::<PyResult<_>>()?;
+
+        self.inner.insert(normalized_key, variables);
+        Ok(())
+    }
+
+    /// Get all variants as a dictionary
+    fn to_dict(&self, py: Python<'_>) -> PyResult<Py<PyDict>> {
+        let dict = PyDict::new(py);
+        for key in self.inner.keys() {
+            if let Some(values) = self.inner.get(key) {
+                let py_values: Vec<Py<PyAny>> = values
+                    .iter()
+                    .map(|v| {
+                        let json_value =
+                            serde_json::to_value(v).map_err(RattlerBuildError::from)?;
+                        pythonize::pythonize(py, &json_value)
+                            .map(|obj| obj.into())
+                            .map_err(|e| RattlerBuildError::Variant(format!("{}", e)).into())
+                    })
+                    .collect::<PyResult<Vec<_>>>()?;
+                dict.set_item(key.normalize(), py_values)?;
+            }
+        }
+        Ok(dict.into())
+    }
+
+    /// Merge another VariantConfig into this one
+    fn merge(&mut self, other: &PyVariantConfig) {
+        self.inner.merge(other.inner.clone());
+    }
+
+    /// Generate combinations of variants
+    fn combinations(&self, py: Python<'_>) -> PyResult<Vec<Py<PyDict>>> {
+        // Use all keys for combinations
+        let used_vars = self.inner.keys().cloned().collect();
+        let combos = self
+            .inner
+            .combinations(&used_vars)
+            .map_err(|e| RattlerBuildError::Variant(format!("{:?}", e)))?;
+        combos
+            .into_iter()
+            .map(|combo| {
+                let dict = PyDict::new(py);
+                for (key, value) in combo {
+                    let json_value =
+                        serde_json::to_value(&value).map_err(RattlerBuildError::from)?;
+                    let py_value = pythonize::pythonize(py, &json_value)
+                        .map_err(|e| RattlerBuildError::Variant(format!("{}", e)))?;
+                    dict.set_item(key.normalize(), py_value)?;
+                }
+                Ok(dict.into())
+            })
+            .collect()
+    }
+
+    fn __len__(&self) -> usize {
+        self.inner.keys().count()
+    }
+
+    fn __repr__(&self) -> String {
+        format!("VariantConfig(keys={})", self.inner.keys().count())
+    }
+}
+
+pub fn register_variant_config_module(
+    _py: Python<'_>,
+    parent_module: &Bound<'_, PyModule>,
+) -> PyResult<()> {
+    parent_module.add_class::<PyVariantConfig>()?;
+    Ok(())
+}
diff --git a/py-rattler-build/tests/data/recipes/test-package/recipe.yaml b/py-rattler-build/tests/data/recipes/comprehensive-test/recipe.yaml
similarity index 100%
rename from py-rattler-build/tests/data/recipes/test-package/recipe.yaml
rename to py-rattler-build/tests/data/recipes/comprehensive-test/recipe.yaml
diff --git a/py-rattler-build/tests/data/recipes/with-staging.yaml b/py-rattler-build/tests/data/recipes/with-staging.yaml
new file mode 100644
index 000000000..c21ed8468
--- /dev/null
+++ b/py-rattler-build/tests/data/recipes/with-staging.yaml
@@ -0,0 +1,77 @@
+schema_version: 1
+
+context:
+  version: "1.2.3"
+
+recipe:
+  name: example-package
+  version: ${{ version }}
+
+source:
+  url: https://example.com/mixed-inheritance-2.0.0.tar.gz
+  sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+
+build:
+  number: 0
+  script:
+    - if: unix
+      then: |
+        echo "Top-level build script"
+        mkdir -p $PREFIX/share
+        echo "data.txt" > $PREFIX/share/data.txt
+    - if: win
+      then: |
+        echo Top-level build script
+        mkdir %PREFIX%\share
+        echo data.txt > %PREFIX%\share\data.txt
+  dynamic_linking:
+    rpaths:
+      - lib/
+      - abc/
+
+about:
+  summary: Project with mixed inheritance
+  license: Apache-2.0
+  license_file: LICENSE
+  repository: https://github.com/foobar/repo
+
+outputs:
+  # Staging output for compiled code
+  - staging:
+      name: compile-stage
+    requirements:
+      build:
+        - ${{ compiler('cxx') }}
+        - cmake
+    build:
+      script:
+        - if: unix
+          then: |
+            mkdir -p $PREFIX/lib
+            echo "compiled.so" > $PREFIX/lib/compiled.so
+        - if: win
+          then: |
+            mkdir %PREFIX%\lib
+            echo compiled.dll > %PREFIX%\lib\compiled.dll
+
+  # Package that inherits from staging (gets compiled library)
+  - package:
+      name: mixed-compiled
+
+    inherit: compile-stage
+    build:
+      files:
+        - lib/**
+    about:
+      summary: Compiled library package
+
+  # Package that inherits from top-level (gets data files from top-level build)
+  - package:
+      name: mixed-data
+      version: "2.0.0"
+    inherit: null # Explicitly inherit from top-level
+    build:
+      files:
+        - share/**
+    about:
+      summary: Data files package
diff --git a/py-rattler-build/tests/unit/test_basic.py b/py-rattler-build/tests/unit/test_basic.py
index 590e5355a..962985c43 100644
--- a/py-rattler-build/tests/unit/test_basic.py
+++ b/py-rattler-build/tests/unit/test_basic.py
@@ -3,7 +3,6 @@
 import rattler_build
 import tomli as tomllib
 import shutil
-import pytest
 
 
 def test_version_match_parent_cargo() -> None:
@@ -36,42 +35,3 @@ def test_test(tmp_path: Path, recipes_dir: Path) -> None:
     for conda_file in output_dir.glob("**/*.conda"):
         rattler_build.test_package(conda_file)
     assert output_dir.joinpath("noarch").is_dir()
-
-
-def test_upload_to_quetz_no_token() -> None:
-    url = "https://quetz.io"
-    channel = "some_channel"
-    with pytest.raises(rattler_build.RattlerBuildError, match="No quetz api key was given"):
-        rattler_build.upload_package_to_quetz([], url, channel)
-
-
-def test_upload_to_artifactory_no_token() -> None:
-    url = "https://artifactory.io"
-    channel = "some_channel"
-    with pytest.raises(rattler_build.RattlerBuildError, match="No bearer token was given"):
-        rattler_build.upload_package_to_artifactory([], url, channel)
-
-
-def test_upload_to_prefix_no_token() -> None:
-    url = "https://prefix.dev"
-    channel = "some_channel"
-    with pytest.raises(rattler_build.RattlerBuildError, match="No prefix.dev api key was given"):
-        rattler_build.upload_package_to_prefix([], url, channel)
-
-
-def test_upload_to_anaconda_no_token() -> None:
-    url = "https://anaconda.org"
-    with pytest.raises(rattler_build.RattlerBuildError, match="No anaconda.org api key was given"):
-        rattler_build.upload_package_to_anaconda([], url)
-
-
-def test_upload_packages_to_conda_forge_invalid_url() -> None:
-    staging_token = "xxx"
-    feedstock = "some_feedstock"
-    feedstock_token = "xxx"
-    anaconda_url = "invalid-url"
-
-    with pytest.raises(rattler_build.RattlerBuildError, match="relative URL without a base"):
-        rattler_build.upload_packages_to_conda_forge(
-            [], staging_token, feedstock, feedstock_token, anaconda_url=anaconda_url
-        )
diff --git a/py-rattler-build/tests/unit/test_error_handling.py b/py-rattler-build/tests/unit/test_error_handling.py
new file mode 100644
index 000000000..ef73dc3b0
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_error_handling.py
@@ -0,0 +1,226 @@
+"""
+Tests for error handling and type validation in the recipe pipeline.
+
+These tests ensure that we get clear, helpful error messages when things go wrong.
+"""
+
+import pytest
+from rattler_build.stage0 import Recipe as Stage0Recipe, SingleOutputRecipe
+from rattler_build.rattler_build import RecipeParseError
+
+
+def test_from_dict_missing_required_field() -> None:
+    """Test that from_dict gives clear error for missing required fields."""
+    # Missing 'name' in package
+    recipe_dict = {
+        "package": {
+            "version": "1.0.0"
+            # missing 'name'
+        }
+    }
+
+    with pytest.raises(RecipeParseError) as exc_info:
+        Stage0Recipe.from_dict(recipe_dict)
+
+    # Error should mention the missing field
+    error_msg = str(exc_info.value)
+    assert "name" in error_msg.lower() or "package" in error_msg.lower()
+
+
+def test_from_dict_wrong_type_for_version() -> None:
+    """Test that from_dict validates version types."""
+    recipe_dict = {
+        "package": {
+            "name": "test-package",
+            "version": 123,  # Should be string
+        }
+    }
+
+    # This should either work (converting to string) or give a clear error
+    # The behavior depends on the parser's strictness
+    try:
+        stage0 = Stage0Recipe.from_dict(recipe_dict)
+        # If it works, version should be converted or accepted
+        assert stage0 is not None
+    except RecipeParseError as e:
+        # If it fails, error should be clear
+        assert "version" in str(e).lower() or "type" in str(e).lower()
+
+
+def test_from_dict_invalid_build_number() -> None:
+    """Test that from_dict validates build number types."""
+    recipe_dict = {
+        "package": {"name": "test-package", "version": "1.0.0"},
+        "build": {
+            "number": "not a number"  # Should be int
+        },
+    }
+
+    with pytest.raises(RecipeParseError) as exc_info:
+        Stage0Recipe.from_dict(recipe_dict)
+
+    error_msg = str(exc_info.value)
+    # Error should mention build or number or type mismatch
+    assert any(word in error_msg.lower() for word in ["build", "number", "int", "type", "invalid"])
+
+
+def test_from_dict_invalid_structure() -> None:
+    """Test that from_dict rejects completely invalid structures."""
+    # Not a dict at all
+    with pytest.raises((RecipeParseError, TypeError, AttributeError)):
+        Stage0Recipe.from_dict({"invalid_key": "value"})
+
+
+def test_from_dict_unknown_top_level_field() -> None:
+    """Test error handling for unknown top-level fields."""
+    recipe_dict = {"package": {"name": "test-package", "version": "1.0.0"}, "unknown_field": "should cause error"}
+
+    with pytest.raises(RecipeParseError) as exc_info:
+        Stage0Recipe.from_dict(recipe_dict)
+
+    error_msg = str(exc_info.value)
+    # Error should mention the unknown field
+    assert "unknown" in error_msg.lower() or "unexpected" in error_msg.lower() or "unknown_field" in error_msg
+
+
+def test_from_dict_invalid_requirements_structure() -> None:
+    """Test error handling for invalid requirements structure."""
+    recipe_dict = {
+        "package": {"name": "test-package", "version": "1.0.0"},
+        "requirements": {
+            "run": "should be a list"  # Should be list, not string
+        },
+    }
+
+    with pytest.raises(RecipeParseError) as exc_info:
+        Stage0Recipe.from_dict(recipe_dict)
+
+    error_msg = str(exc_info.value)
+    # Error should mention sequence or type mismatch
+    assert "sequence" in error_msg.lower() or "array" in error_msg.lower() or "type" in error_msg.lower()
+
+
+def test_from_yaml_invalid_yaml_syntax() -> None:
+    """Test error handling for invalid YAML syntax."""
+    invalid_yaml = """
+    package:
+      name: test
+      version: [unclosed bracket
+    """
+
+    with pytest.raises(RecipeParseError):
+        Stage0Recipe.from_yaml(invalid_yaml)
+
+
+def test_from_yaml_missing_package_section() -> None:
+    """Test error handling when package section is missing."""
+    yaml_without_package = """
+build:
+  number: 0
+"""
+
+    with pytest.raises(RecipeParseError) as exc_info:
+        Stage0Recipe.from_yaml(yaml_without_package)
+
+    error_msg = str(exc_info.value)
+    # Should mention package is required
+    assert "package" in error_msg.lower()
+
+
+def test_from_dict_empty_dict() -> None:
+    """Test error handling for empty dictionary."""
+    with pytest.raises(RecipeParseError) as exc_info:
+        Stage0Recipe.from_dict({})
+
+    error_msg = str(exc_info.value)
+    assert "package" in error_msg.lower() or "required" in error_msg.lower()
+
+
+def test_from_dict_nested_validation() -> None:
+    """Test that nested field validation provides clear errors."""
+    recipe_dict = {
+        "package": {"name": "test-package", "version": "1.0.0"},
+        "build": {
+            "number": 0,
+            "python": {
+                "entry_points": "should be a list"  # Should be list
+            },
+        },
+    }
+
+    with pytest.raises(RecipeParseError) as exc_info:
+        Stage0Recipe.from_dict(recipe_dict)
+
+    error_msg = str(exc_info.value)
+    # Error should mention sequence or type mismatch
+    assert "sequence" in error_msg.lower() or "type" in error_msg.lower()
+
+
+def test_from_dict_provides_helpful_message() -> None:
+    """Test that from_dict accepts integer names and converts them."""
+    recipe_dict = {
+        "package": {
+            "name": 123,  # Will be converted to string
+            "version": "1.0.0",
+        }
+    }
+
+    # Integer names are accepted and converted to strings
+    stage0 = Stage0Recipe.from_dict(recipe_dict)
+    assert stage0 is not None
+
+
+def test_from_dict_list_of_strings_vs_object() -> None:
+    """Test clear errors when expecting list but getting something else."""
+    recipe_dict = {
+        "package": {"name": "test-package", "version": "1.0.0"},
+        "requirements": {
+            "host": {"not": "a list"}  # Should be list
+        },
+    }
+
+    with pytest.raises(RecipeParseError) as exc_info:
+        Stage0Recipe.from_dict(recipe_dict)
+
+    error_msg = str(exc_info.value)
+    # Should indicate type mismatch (sequence expected)
+    assert "sequence" in error_msg.lower() or "type" in error_msg.lower()
+
+
+def test_error_includes_field_path() -> None:
+    """Test that errors include the path to the problematic field."""
+    recipe_dict = {
+        "package": {"name": "test-package", "version": "1.0.0"},
+        "build": {
+            "dynamic_linking": {
+                "binary_relocation": "not a boolean"  # Should be bool
+            }
+        },
+    }
+
+    with pytest.raises(RecipeParseError) as exc_info:
+        Stage0Recipe.from_dict(recipe_dict)
+
+    error_msg = str(exc_info.value)
+    # Error should help locate the problem
+    # It might mention the field name or path
+    assert any(
+        word in error_msg.lower() for word in ["dynamic_linking", "binary_relocation", "build", "bool", "boolean"]
+    )
+
+
+def test_from_dict_valid_minimal_recipe() -> None:
+    """Test that a minimal valid recipe works."""
+    # This should NOT raise an error
+    recipe_dict = {"package": {"name": "minimal-package", "version": "1.0.0"}}
+
+    stage0 = Stage0Recipe.from_dict(recipe_dict)
+    assert isinstance(stage0, SingleOutputRecipe)
+
+
+def test_from_dict_with_schema_version() -> None:
+    """Test that schema_version is accepted."""
+    recipe_dict = {"schema_version": 1, "package": {"name": "versioned-package", "version": "1.0.0"}}
+
+    stage0 = Stage0Recipe.from_dict(recipe_dict)
+    assert stage0 is not None
diff --git a/py-rattler-build/tests/unit/test_jinja_config.py b/py-rattler-build/tests/unit/test_jinja_config.py
new file mode 100644
index 000000000..80c5aceb1
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_jinja_config.py
@@ -0,0 +1,104 @@
+"""Tests for JinjaConfig (JinjaConfig) Python bindings."""
+
+import pytest
+from rattler_build.jinja_config import JinjaConfig
+
+
+def test_jinja_config_creation() -> None:
+    """Test creating a JinjaConfig with default values."""
+    config = JinjaConfig()
+
+    assert config.target_platform is not None
+    assert config.host_platform is not None
+    assert config.build_platform is not None
+    assert isinstance(config.experimental, bool)
+    assert isinstance(config.allow_undefined, bool)
+
+
+def test_jinja_config_with_platforms() -> None:
+    """Test creating a JinjaConfig with specific platforms."""
+    config = JinjaConfig(target_platform="linux-64", host_platform="linux-64", build_platform="linux-64")
+
+    assert config.target_platform == "linux-64"
+    assert config.host_platform == "linux-64"
+    assert config.build_platform == "linux-64"
+
+
+def test_jinja_config_platform_setters() -> None:
+    """Test setting platforms after creation."""
+    config = JinjaConfig()
+
+    config.target_platform = "win-64"
+    assert config.target_platform == "win-64"
+
+    config.host_platform = "osx-arm64"
+    assert config.host_platform == "osx-arm64"
+
+    config.build_platform = "linux-aarch64"
+    assert config.build_platform == "linux-aarch64"
+
+
+def test_selector_config_experimental() -> None:
+    """Test experimental flag."""
+    config = JinjaConfig(experimental=True)
+    assert config.experimental is True
+
+    config.experimental = False
+    assert config.experimental is False
+
+
+def test_selector_config_allow_undefined() -> None:
+    """Test allow_undefined flag."""
+    config = JinjaConfig(allow_undefined=True)
+    assert config.allow_undefined is True
+
+    config.allow_undefined = False
+    assert config.allow_undefined is False
+
+
+def test_selector_config_with_variant() -> None:
+    """Test creating a JinjaConfig with variant."""
+    variant = {"python": "3.11", "numpy": "1.21"}
+    config = JinjaConfig(variant=variant)
+
+    assert config.variant is not None
+    # Check that variant was set (exact structure depends on implementation)
+    assert isinstance(config.variant, dict)
+
+
+def test_selector_config_variant_setter() -> None:
+    """Test setting variant after creation."""
+    config = JinjaConfig()
+
+    variant = {"python": "3.10", "build_number": 1}
+    config.variant = variant
+
+    assert config.variant is not None
+    assert isinstance(config.variant, dict)
+
+
+def test_selector_config_config_property() -> None:
+    """Test that the config property returns the underlying PyJinjaConfig."""
+    config = JinjaConfig(target_platform="linux-64")
+
+    # The config property should return the internal _config
+    underlying_config = config.config
+    assert underlying_config is not None
+
+    # It should be the same object
+    assert underlying_config is config._config
+
+
+def test_selector_config_repr() -> None:
+    """Test the string representation."""
+    config = JinjaConfig(target_platform="osx-64")
+    repr_str = repr(config)
+
+    assert "JinjaConfig" in repr_str
+    assert "osx-64" in repr_str
+
+
+def test_selector_config_invalid_platform() -> None:
+    """Test that invalid platforms are rejected."""
+    with pytest.raises(Exception):  # Should raise some error
+        JinjaConfig(target_platform="invalid-platform-name-12345")
diff --git a/py-rattler-build/tests/unit/test_pipeline.py b/py-rattler-build/tests/unit/test_pipeline.py
new file mode 100644
index 000000000..24ad6d854
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_pipeline.py
@@ -0,0 +1,595 @@
+"""
+Comprehensive tests for the full rattler-build pipeline.
+
+Tests the complete flow: Stage0 Recipe -> Render -> Stage1 Recipe
+"""
+
+import pytest
+from rattler_build.stage0 import MultiOutputRecipe, Recipe as Stage0Recipe, SingleOutputRecipe
+from rattler_build.variant_config import VariantConfig
+from rattler_build.render import render_recipe, RenderConfig
+
+
+def test_pipeline_from_yaml_to_stage1() -> None:
+    """Test complete pipeline from YAML to Stage1 recipe."""
+    yaml_content = """
+package:
+  name: my-package
+  version: 1.0.0
+
+build:
+  number: 0
+
+requirements:
+  host:
+    - python
+  run:
+    - python
+"""
+
+    # Step 1: Parse to Stage0
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    assert isinstance(stage0, SingleOutputRecipe)
+
+    # Step 2: Create variant config
+    variant_config = VariantConfig()
+
+    # Step 3: Render to get Stage1
+    rendered = render_recipe(stage0, variant_config)
+    assert len(rendered) == 1
+
+    # Step 4: Access Stage1 recipe
+    stage1 = rendered[0].recipe()
+    # Note: The Python wrapper class name might differ from the import
+    assert stage1 is not None
+    assert stage1.package.name == "my-package"
+    assert str(stage1.package.version) == "1.0.0"
+
+
+def test_pipeline_from_dict_to_stage1() -> None:
+    """Test complete pipeline from Python dict to Stage1 recipe."""
+    recipe_dict = {
+        "package": {"name": "dict-package", "version": "2.0.0"},
+        "build": {"number": 0},
+        "requirements": {"run": ["numpy"]},
+    }
+
+    # Step 1: Create Stage0 from dict
+    stage0 = Stage0Recipe.from_dict(recipe_dict)
+    assert isinstance(stage0, SingleOutputRecipe)
+
+    # Step 2: Render
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    # Step 3: Verify Stage1
+    stage1 = rendered[0].recipe()
+    assert stage1.package.name == "dict-package"
+    assert stage1.package.version == "2.0.0"
+
+
+def test_pipeline_with_variants() -> None:
+    """Test pipeline with variant combinations."""
+    yaml_content = """
+package:
+  name: variant-package
+  version: 1.0.0
+
+requirements:
+  host:
+    - python
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+
+    # Create variant config with multiple python versions
+    variant_config = VariantConfig()
+    variant_config.set_values("python", ["3.9", "3.10", "3.11"])
+
+    # Render with variants
+    rendered = render_recipe(stage0, variant_config)
+
+    # Should have 3 variants
+    assert len(rendered) == 3
+
+    # Each variant should have different python version in used_variant
+    for i, variant in enumerate(rendered):
+        stage1 = variant.recipe()
+        assert stage1.package.name == "variant-package"
+        # Check that the variant was used
+        assert "python" in variant.variant()
+
+
+def test_pipeline_multi_output() -> None:
+    """Test pipeline with multi-output recipe."""
+    yaml_content = """
+recipe:
+  name: multi-package
+  version: 1.0.0
+
+outputs:
+  - package:
+      name: multi-lib
+    requirements:
+      run:
+        - libfoo
+
+  - package:
+      name: multi-dev
+    requirements:
+      run:
+        - multi-lib
+"""
+
+    # Parse Stage0
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    assert isinstance(stage0, MultiOutputRecipe)
+
+    # Render
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    # Should have 2 outputs
+    assert len(rendered) == 2
+
+    # Check output names
+    names = {r.recipe().package.name for r in rendered}
+    assert names == {"multi-lib", "multi-dev"}
+
+
+def test_pipeline_with_render_config() -> None:
+    """Test pipeline with custom RenderConfig."""
+    yaml_content = """
+package:
+  name: platform-package
+  version: 1.0.0
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+
+    # Create custom render config for linux
+    render_config = RenderConfig(target_platform="linux-64")
+
+    # Render with custom config
+    rendered = render_recipe(stage0, variant_config, render_config)
+
+    assert len(rendered) == 1
+    stage1 = rendered[0].recipe()
+    assert stage1.package.name == "platform-package"
+
+
+def test_pipeline_hash_info() -> None:
+    """Test that hash_info is available after rendering."""
+    yaml_content = """
+package:
+  name: hash-package
+  version: 1.0.0
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    # Hash info should be available
+    hash_info = rendered[0].hash_info()
+    assert hash_info is not None
+    assert isinstance(hash_info.hash, str)
+    assert len(hash_info.hash) == 7
+
+
+def test_pipeline_pin_subpackages() -> None:
+    """Test pin_subpackage information in pipeline."""
+    yaml_content = """
+recipe:
+  name: pin-test
+
+outputs:
+  - package:
+      name: pin-lib
+      version: 1.0.0
+
+  - package:
+      name: pin-app
+      version: 1.0.0
+    requirements:
+      host:
+        - ${{ pin_subpackage('pin-lib', exact=True) }}
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    # Find the pin-app output
+    app_variant = None
+    for variant in rendered:
+        if variant.recipe().package.name == "pin-app":
+            app_variant = variant
+            break
+
+    assert app_variant is not None
+
+    # Check pin_subpackages
+    pins = app_variant.pin_subpackages()
+    assert "pin-lib" in pins
+    assert pins["pin-lib"].exact is True
+
+
+def test_pipeline_stage0_to_dict() -> None:
+    """Test that Stage0 can be converted to dict."""
+    yaml_content = """
+package:
+  name: roundtrip-package
+  version: 1.0.0
+
+build:
+  number: 5
+"""
+
+    # Parse to Stage0
+    stage0_original = Stage0Recipe.from_yaml(yaml_content)
+
+    # Convert to dict
+    recipe_dict = stage0_original.to_dict()
+    assert isinstance(recipe_dict, dict)
+    assert recipe_dict["package"]["name"] == "roundtrip-package"
+
+    # Note: Round-tripping from to_dict() output may not work directly
+    # because to_dict() includes all defaults with their serialized form
+    # which may not always be valid for from_dict()
+    # For practical use, users should construct minimal dicts manually
+
+    # Just verify we can render the original
+    variant_config = VariantConfig()
+    rendered_original = render_recipe(stage0_original, variant_config)
+
+    assert len(rendered_original) == 1
+    assert rendered_original[0].recipe().package.name == "roundtrip-package"
+
+
+def test_pipeline_stage1_properties() -> None:
+    """Test accessing all Stage1 recipe properties."""
+    yaml_content = """
+context:
+  version: 1.0.0
+
+package:
+  name: props-package
+  version: ${{ version }}
+
+build:
+  number: 0
+
+requirements:
+  build:
+    - cmake
+  host:
+    - python
+  run:
+    - python
+
+about:
+  summary: A test package
+  license: MIT
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    stage1 = rendered[0].recipe()
+
+    # Test all properties
+    assert stage1.package.name == "props-package"
+    assert stage1.package.version == "1.0.0"
+
+    assert stage1.build is not None
+
+    assert stage1.requirements is not None
+
+    assert stage1.about is not None
+
+    assert isinstance(stage1.context, dict)
+
+    assert isinstance(stage1.used_variant, dict)
+
+
+def test_pipeline_used_variant() -> None:
+    """Test that used_variant contains the variant values."""
+    yaml_content = """
+package:
+  name: variant-tracking
+  version: 1.0.0
+
+requirements:
+  host:
+    - python
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+
+    variant_config = VariantConfig()
+    variant_config.set_values("python", ["3.10"])
+
+    rendered = render_recipe(stage0, variant_config)
+    stage1 = rendered[0].recipe()
+
+    # used_variant should contain python
+    used_variant = stage1.used_variant
+    assert "python" in used_variant
+
+
+def test_pipeline_context_preservation() -> None:
+    """Test that context is preserved through the pipeline."""
+    yaml_content = """
+context:
+  my_var: custom_value
+  version: 2.0.0
+
+package:
+  name: context-package
+  version: ${{ version }}
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+
+    # Check Stage0 context
+    stage0_context = stage0.context
+
+    assert isinstance(stage0, SingleOutputRecipe)
+    assert "my_var" in stage0_context
+    assert stage0_context["my_var"] == "custom_value"
+
+    # Render and check Stage1 context
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+    stage1 = rendered[0].recipe()
+
+    stage1_context = stage1.context
+    assert "my_var" in stage1_context
+    assert stage1_context["my_var"] == "custom_value"
+    assert stage1.package.version == "2.0.0"
+
+
+def test_pipeline_multiple_renders() -> None:
+    """Test rendering the same Stage0 recipe multiple times."""
+    yaml_content = """
+package:
+  name: reusable-recipe
+  version: 1.0.0
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+
+    # Render multiple times
+    rendered1 = render_recipe(stage0, variant_config)
+    rendered2 = render_recipe(stage0, variant_config)
+
+    # Both should work
+    assert len(rendered1) == 1
+    assert len(rendered2) == 1
+
+    assert rendered1[0].recipe().package.name == "reusable-recipe"
+    assert rendered2[0].recipe().package.name == "reusable-recipe"
+
+
+def test_pipeline_from_dict_error_missing_package() -> None:
+    """Test that creating recipe from dict with missing package field gives good error."""
+    recipe_dict = {"build": {"number": 0}}
+
+    with pytest.raises(Exception) as exc_info:
+        Stage0Recipe.from_dict(recipe_dict)
+
+    error_msg = str(exc_info.value).lower()
+    assert "failed to deserialize recipe" in error_msg or "missing" in error_msg
+
+
+def test_pipeline_from_dict_error_wrong_type() -> None:
+    """Test that creating recipe from dict accepts numeric version (gets converted to string)."""
+    # Note: Version 123 gets converted to "123" automatically by serde
+    # This is actually valid behavior
+    recipe_dict = {"package": {"name": "test", "version": 123}}
+
+    # This should actually work - numeric values get stringified
+    recipe = Stage0Recipe.from_dict(recipe_dict)
+    assert recipe is not None
+
+
+def test_pipeline_from_dict_error_invalid_structure() -> None:
+    """Test that creating recipe from dict with invalid structure gives good error."""
+    recipe_dict = {"invalid_key": "value", "another_invalid": 123}
+
+    with pytest.raises(Exception) as exc_info:
+        Stage0Recipe.from_dict(recipe_dict)
+
+    error_msg = str(exc_info.value)
+    # The error message contains debug format, check for "missing" or "package" field
+    assert "missing" in error_msg.lower() or "package" in error_msg.lower()
+
+
+def test_pipeline_stage1_requirements_detail() -> None:
+    """Test detailed access to Stage1 requirements lists."""
+    yaml_content = """
+package:
+  name: req-detail-test
+  version: 1.0.0
+
+requirements:
+  build:
+    - cmake
+    - gcc
+  host:
+    - python >=3.8
+    - numpy
+  run:
+    - python >=3.8
+    - numpy
+    - pandas
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    stage1 = rendered[0].recipe()
+    reqs = stage1.requirements
+
+    # Test that requirements are accessible as lists
+    build_reqs = reqs.build
+    assert isinstance(build_reqs, list)
+    assert len(build_reqs) >= 2
+
+    host_reqs = reqs.host
+    assert isinstance(host_reqs, list)
+    assert len(host_reqs) >= 2
+
+    run_reqs = reqs.run
+    assert isinstance(run_reqs, list)
+    assert len(run_reqs) >= 3
+
+
+def test_pipeline_stage1_about_detail() -> None:
+    """Test detailed access to Stage1 about metadata."""
+    yaml_content = """
+package:
+  name: about-detail-test
+  version: 1.0.0
+
+about:
+  summary: This is a detailed test
+  license: Apache-2.0
+  homepage: https://example.com
+  repository: https://github.com/example/repo
+  documentation: https://docs.example.com
+  description: |
+    A longer description
+    that spans multiple lines.
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    stage1 = rendered[0].recipe()
+    about = stage1.about
+
+    assert about.summary == "This is a detailed test"
+    assert about.license == "Apache-2.0"
+    # URLs may have trailing slash added
+    assert "https://example.com" in about.homepage
+    assert "https://github.com/example/repo" in about.repository
+    assert "https://docs.example.com" in about.documentation
+    assert about.description is not None
+    assert "longer description" in about.description
+
+
+def test_pipeline_stage1_build_properties() -> None:
+    """Test detailed access to Stage1 build properties."""
+    yaml_content = """
+package:
+  name: build-detail-test
+  version: 1.0.0
+
+build:
+  number: 42
+  string: custom_string
+  script:
+    - echo "Building"
+    - make install
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    stage1 = rendered[0].recipe()
+    build = stage1.build
+
+    assert build.number == 42
+    # Note: build.string may be evaluated differently in Stage1
+    assert build.string is not None
+
+
+def test_pipeline_stage1_sources() -> None:
+    """Test that Stage1 sources list is accessible."""
+    yaml_content = """
+package:
+  name: source-test
+  version: 1.0.0
+
+source:
+  url: https://example.com/package.tar.gz
+  sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    stage1 = rendered[0].recipe()
+
+    # sources should be a list
+    sources = stage1.sources
+    assert isinstance(sources, list)
+
+
+def test_pipeline_rendered_variant_repr() -> None:
+    """Test that RenderedVariant has a useful repr."""
+    yaml_content = """
+package:
+  name: repr-test
+  version: 1.0.0
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    variant = rendered[0]
+    repr_str = repr(variant)
+
+    assert "RenderedVariant" in repr_str
+    assert "repr-test" in repr_str
+
+
+def test_pipeline_stage1_to_dict_comprehensive() -> None:
+    """Test that Stage1 to_dict produces a comprehensive dictionary."""
+    yaml_content = """
+package:
+  name: comprehensive-test
+  version: 1.0.0
+
+build:
+  number: 5
+
+requirements:
+  host:
+    - python
+  run:
+    - python
+
+about:
+  summary: Test
+  license: MIT
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    stage1 = rendered[0].recipe()
+    stage1_dict = stage1.to_dict()
+
+    # Verify it's a proper dictionary with expected keys
+    assert isinstance(stage1_dict, dict)
+    assert "package" in stage1_dict
+    assert "build" in stage1_dict
+    assert "requirements" in stage1_dict
+    assert "about" in stage1_dict
+
+    # Verify nested structure
+    assert "name" in stage1_dict["package"]
+    assert "version" in stage1_dict["package"]
+    assert stage1_dict["package"]["name"] == "comprehensive-test"
diff --git a/py-rattler-build/tests/unit/test_recipe_api.py b/py-rattler-build/tests/unit/test_recipe_api.py
new file mode 100644
index 000000000..dfc85bc84
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_recipe_api.py
@@ -0,0 +1,445 @@
+"""
+Modern recipe API tests using Stage0/Stage1/Render infrastructure.
+
+This replaces the old test_recipe_oop.py with the new pipeline architecture.
+"""
+
+from pathlib import Path
+from rattler_build.stage0 import MultiOutputRecipe, Recipe as Stage0Recipe, SingleOutputRecipe
+from rattler_build.variant_config import VariantConfig
+from rattler_build.render import render_recipe, RenderConfig, build_rendered_variants
+
+
+TEST_DATA_DIR = Path(__file__).parent.parent / "data" / "recipes" / "comprehensive-test"
+TEST_RECIPE_FILE = TEST_DATA_DIR / "recipe.yaml"
+
+
+def test_recipe_all_sections() -> None:
+    """Test accessing all recipe sections through Stage0 and Stage1."""
+    # Parse to Stage0
+    stage0 = Stage0Recipe.from_file(str(TEST_RECIPE_FILE))
+    assert stage0 is not None
+    assert isinstance(stage0, SingleOutputRecipe)
+
+    # Test Stage0 Package
+    package_dict = stage0.package.to_dict()
+    assert package_dict["name"] == "test-package"
+    assert package_dict["version"] == "1.0.0"
+
+    # Render to Stage1 for full access
+    variant_config = VariantConfig()
+    render_config = RenderConfig()
+    rendered = render_recipe(stage0, variant_config, render_config)
+
+    assert len(rendered) == 1
+    stage1 = rendered[0].recipe()
+
+    # Stage1 Package - fully evaluated
+    assert stage1.package.name == "test-package"
+    assert str(stage1.package.version) == "1.0.0"
+
+    # Stage1 Source
+    sources = stage1.sources
+    assert len(sources) == 1
+    source_dict = sources[0].to_dict()
+    assert "url" in source_dict
+
+    # Stage1 Build
+    build = stage1.build
+    assert build.number == 0
+    assert build.noarch is None  # Not a noarch build
+
+    # Stage1 Requirements - fully evaluated for target platform
+    reqs = stage1.requirements
+    host_reqs = reqs.host
+    run_reqs = reqs.run
+
+    # Should have python and pip at minimum
+    assert len(host_reqs) >= 2
+    assert len(run_reqs) >= 1
+
+    # Stage1 About
+    about = stage1.about
+    assert about.summary == "A comprehensive test package"
+    assert about.license == "MIT"
+    assert "https://example.com" in about.homepage
+    assert "https://github.com/example/test-package" in about.repository
+
+
+def test_recipe_representations() -> None:
+    """Test string representations of Stage0 and Stage1 objects."""
+    stage0 = Stage0Recipe.from_file(str(TEST_RECIPE_FILE))
+
+    # Stage0 repr
+    recipe_repr = repr(stage0)
+    assert "Stage0Recipe" in recipe_repr or "Recipe" in recipe_repr
+
+    # Render to Stage1
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+    stage1 = rendered[0].recipe()
+
+    # Stage1 recipe repr
+    stage1_repr = repr(stage1)
+    assert "Stage1Recipe" in stage1_repr
+    assert "test-package" in stage1_repr
+
+    # Stage1 Package repr
+    package_repr = repr(stage1.package)
+    assert "Stage1Package" in package_repr
+    assert "test-package" in package_repr
+    assert "1.0.0" in package_repr
+
+    # Other component reprs
+    assert "Stage1Build" in repr(stage1.build)
+    assert "Stage1Requirements" in repr(stage1.requirements)
+    assert "Stage1About" in repr(stage1.about)
+
+
+def test_render_config_with_variants() -> None:
+    """Test RenderConfig with variant configuration."""
+    render_config = RenderConfig(target_platform="linux-64")
+    assert render_config.target_platform == "linux-64"
+
+    # Set extra context (similar to variants)
+    render_config.set_context("python", "3.11")
+    render_config.set_context("build_number", "1")
+
+    assert render_config.get_context("python") == "3.11"
+    assert render_config.get_context("build_number") == "1"
+
+
+def test_render_config_setters() -> None:
+    """Test RenderConfig property setters."""
+    config = RenderConfig()
+
+    # Test target_platform - create new config to change it
+    initial_target = config.target_platform
+    config_win = RenderConfig(target_platform="win-64")
+    assert config_win.target_platform == "win-64"
+    assert config_win.target_platform != initial_target
+
+    # Test host_platform
+    config_host = RenderConfig(host_platform="win-64")
+    assert config_host.host_platform == "win-64"
+
+    # Test build_platform
+    config_build = RenderConfig(build_platform="win-64")
+    assert config_build.build_platform == "win-64"
+
+    # Test experimental
+    config_exp = RenderConfig(experimental=True)
+    assert config_exp.experimental is True
+
+    # Test context (variant-like values)
+    config.set_context("python", "3.9")
+    config.set_context("numpy", "1.21")
+
+    all_context = config.get_all_context()
+    assert "python" in all_context
+    assert all_context["python"] == "3.9"
+    assert "numpy" in all_context
+    assert all_context["numpy"] == "1.21"
+
+
+def test_parse_recipe_with_platform_selectors() -> None:
+    """Test parsing recipe with platform selectors for different platforms."""
+    stage0 = Stage0Recipe.from_file(str(TEST_RECIPE_FILE))
+    variant_config = VariantConfig()
+
+    # Render for Linux
+    linux_config = RenderConfig(target_platform="linux-64", build_platform="linux-64", host_platform="linux-64")
+    rendered_linux = render_recipe(stage0, variant_config, linux_config)
+    stage1_linux = rendered_linux[0].recipe()
+
+    # Render for Windows
+    windows_config = RenderConfig(target_platform="win-64", build_platform="win-64", host_platform="win-64")
+    rendered_windows = render_recipe(stage0, variant_config, windows_config)
+    stage1_windows = rendered_windows[0].recipe()
+
+    # Both should parse the same package
+    assert stage1_linux.package.name == "test-package"
+    assert stage1_windows.package.name == "test-package"
+
+    # Both should have requirements, but they may differ due to selectors
+    assert len(stage1_linux.requirements.host) > 0
+    assert len(stage1_windows.requirements.host) > 0
+
+    # The number of requirements might differ due to platform-specific selectors
+    # For example, gcc only on unix, pywin32 only on windows
+    linux_host_count = len(stage1_linux.requirements.host)
+    windows_host_count = len(stage1_windows.requirements.host)
+
+    # At minimum both should have python and pip
+    assert linux_host_count >= 2
+    assert windows_host_count >= 2
+
+
+def test_recipe_with_variants() -> None:
+    """Test recipe parsing with variant substitution."""
+    yaml_content = """
+package:
+  name: variant-test
+  version: 1.0.0
+
+requirements:
+  host:
+    - python ${{ python }}.*
+  run:
+    - python
+
+build:
+  number: ${{ build_number }}
+"""
+
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+
+    # Create variant config with python version
+    variant_config = VariantConfig()
+    variant_config.set_values("python", ["3.11"])
+
+    # Render with context for build_number
+    render_config = RenderConfig()
+    render_config.set_context("build_number", "1")
+
+    rendered = render_recipe(stage0, variant_config, render_config)
+    stage1 = rendered[0].recipe()
+
+    assert stage1.package.name == "variant-test"
+    assert str(stage1.package.version) == "1.0.0"
+
+    # Check that variant was used
+    variant_dict = rendered[0].variant()
+    assert "python" in variant_dict
+    assert variant_dict["python"] == "3.11"
+
+    # Build number should be evaluated from context
+    assert stage1.build.number == 1
+
+
+def test_stage0_to_stage1_complete_flow() -> None:
+    """Test the complete flow from file to Stage1 with all features."""
+    # Load from file
+    stage0 = Stage0Recipe.from_file(str(TEST_RECIPE_FILE))
+
+    assert stage0 is not None
+
+    # Access Stage0 properties
+    stage0_dict = stage0.to_dict()
+    assert "package" in stage0_dict
+    assert "build" in stage0_dict
+    assert "requirements" in stage0_dict
+    assert "about" in stage0_dict
+
+    # Render to Stage1
+    variant_config = VariantConfig()
+    render_config = RenderConfig(target_platform="linux-64")
+    rendered = render_recipe(stage0, variant_config, render_config)
+
+    # Access Stage1
+    variant = rendered[0]
+    stage1 = variant.recipe()
+
+    # Verify Stage1 properties are all accessible
+    assert stage1.package is not None
+    assert stage1.build is not None
+    assert stage1.requirements is not None
+    assert stage1.about is not None
+    assert stage1.context is not None
+    assert stage1.used_variant is not None
+    assert stage1.sources is not None
+
+    # Convert Stage1 to dict
+    stage1_dict = stage1.to_dict()
+    assert isinstance(stage1_dict, dict)
+    assert "package" in stage1_dict
+
+
+def test_multi_output_recipe_api() -> None:
+    """Test API with multi-output recipes."""
+    yaml_content = """
+schema_version: 1
+
+context:
+  name: multi-test
+  version: "2.0.0"
+
+recipe:
+  version: ${{ version }}
+
+outputs:
+  - package:
+      name: ${{ name }}-lib
+    requirements:
+      run:
+        - libfoo
+
+  - package:
+      name: ${{ name }}-dev
+    requirements:
+      run:
+        - ${{ name }}-lib
+
+about:
+  summary: Multi-output test package
+  license: MIT
+"""
+
+    # Parse Stage0
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    assert isinstance(stage0, MultiOutputRecipe)
+    assert stage0 is not None
+    assert len(stage0.outputs) == 2
+
+    # Render to Stage1
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    # Should have 2 outputs
+    assert len(rendered) == 2
+
+    # Check both outputs
+    names = {r.recipe().package.name for r in rendered}
+    assert names == {"multi-test-lib", "multi-test-dev"}
+
+    # Both should be valid Stage1 recipes
+    for variant in rendered:
+        stage1 = variant.recipe()
+        assert stage1.package is not None
+        assert stage1.build is not None
+        assert stage1.requirements is not None
+
+
+def test_recipe_with_jinja_context() -> None:
+    """Test recipe with Jinja2 context variables."""
+    yaml_content = """
+context:
+  pkg_name: jinja-test
+  pkg_version: "3.2.1"
+  summary_text: "A test with Jinja"
+
+package:
+  name: ${{ pkg_name }}
+  version: ${{ pkg_version }}
+
+about:
+  summary: ${{ summary_text }}
+  license: BSD-3-Clause
+
+build:
+  number: 0
+"""
+
+    # Parse Stage0
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    assert isinstance(stage0, SingleOutputRecipe)
+    assert stage0 is not None
+
+    # Check Stage0 context is preserved
+    stage0_context = stage0.context
+    assert "pkg_name" in stage0_context
+    assert stage0_context["pkg_name"] == "jinja-test"
+
+    # Render to Stage1
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+    stage1 = rendered[0].recipe()
+
+    # Jinja should be evaluated
+    assert stage1.package.name == "jinja-test"
+    assert str(stage1.package.version) == "3.2.1"
+    assert stage1.about.summary == "A test with Jinja"
+
+    # Context should still be accessible in Stage1
+    stage1_context = stage1.context
+    assert "pkg_name" in stage1_context
+    assert stage1_context["pkg_name"] == "jinja-test"
+
+
+def test_recipe_from_dict_api() -> None:
+    """Test creating recipes from Python dictionaries."""
+    recipe_dict = {
+        "package": {"name": "dict-api-test", "version": "4.5.6"},
+        "build": {"number": 0, "script": "echo 'Building'"},
+        "requirements": {"host": ["python"], "run": ["python"]},
+        "about": {"summary": "Created from dict", "license": "Apache-2.0"},
+    }
+
+    # Create Stage0 from dict
+    stage0 = Stage0Recipe.from_dict(recipe_dict)
+
+    # Render to Stage1
+    variant_config = VariantConfig()
+    rendered = stage0.render(variant_config)
+    stage1 = rendered[0].recipe()
+
+    # Verify all properties
+    assert stage1.package.name == "dict-api-test"
+    assert str(stage1.package.version) == "4.5.6"
+    assert stage1.build.number == 0
+    assert len(stage1.requirements.host) >= 1
+    assert len(stage1.requirements.run) >= 1
+    assert stage1.about.summary == "Created from dict"
+    assert stage1.about.license == "Apache-2.0"
+
+
+def test_rendered_variant_run_build() -> None:
+    """Test that RenderedVariant has a run_build() method."""
+    yaml_content = """
+package:
+  name: build-test
+  version: 1.0.0
+
+build:
+  number: 0
+  script: echo "Building"
+
+requirements:
+  host:
+    - python
+  run:
+    - python
+"""
+    # Parse and render
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    rendered = render_recipe(stage0, variant_config)
+
+    # Verify that RenderedVariant has run_build method
+    assert hasattr(rendered[0], "run_build")
+    assert callable(rendered[0].run_build)
+
+    # Note: We don't actually call run_build() in this test to avoid
+    # creating actual build artifacts during testing
+
+
+def test_build_rendered_variants_function() -> None:
+    """Test the build_rendered_variants() free function."""
+    yaml_content = """
+package:
+  name: multi-build-test
+  version: 2.0.0
+
+build:
+  number: 0
+
+requirements:
+  host:
+    - python ${{ python }}
+  run:
+    - python
+"""
+    # Parse and render with multiple variants
+    stage0 = Stage0Recipe.from_yaml(yaml_content)
+    variant_config = VariantConfig()
+    variant_config.set_values("python", ["3.10.*", "3.11.*"])
+    rendered = render_recipe(stage0, variant_config)
+
+    # Should have 2 variants
+    assert len(rendered) == 2
+
+    # Verify build_rendered_variants exists and is callable
+    assert callable(build_rendered_variants)
+
+    # Note: We don't actually call build_rendered_variants() to avoid
+    # creating actual build artifacts during testing
diff --git a/py-rattler-build/tests/unit/test_recipe_oop.py b/py-rattler-build/tests/unit/test_recipe_oop.xpy
similarity index 88%
rename from py-rattler-build/tests/unit/test_recipe_oop.py
rename to py-rattler-build/tests/unit/test_recipe_oop.xpy
index 3c8690ce2..8f12f29c8 100644
--- a/py-rattler-build/tests/unit/test_recipe_oop.py
+++ b/py-rattler-build/tests/unit/test_recipe_oop.xpy
@@ -1,6 +1,6 @@
 from pathlib import Path
-from rattler_build import Recipe, SelectorConfig
-from rattler_build.rattler_build import parse_recipe_py
+from rattler_build import Recipe, JinjaConfig
+# from rattler_build.rattler_build import parse_recipe_py
 
 TEST_DATA_DIR = Path(__file__).parent.parent / "data" / "recipes" / "test-package"
 TEST_RECIPE_FILE = TEST_DATA_DIR / "recipe.yaml"
@@ -87,16 +87,16 @@ def test_recipe_representations() -> None:
 
 
 def test_selector_config_with_variants() -> None:
-    """Test SelectorConfig with variant configuration"""
-    config = SelectorConfig(target_platform="linux-64", variant={"python": "3.11", "build_number": 1})
+    """Test JinjaConfig with variant configuration"""
+    config = JinjaConfig(target_platform="linux-64", variant={"python": "3.11", "build_number": 1})
     assert config.target_platform == "linux-64"
     assert config.variant["python"] == "3.11"
     assert config.variant["build_number"] == 1
 
 
 def test_selector_config_setters() -> None:
-    """Test SelectorConfig property setters"""
-    config = SelectorConfig()
+    """Test JinjaConfig property setters"""
+    config = JinjaConfig()
 
     initial_target = config.target_platform  # Store initial value (may have default)
     config.target_platform = "win-64"
@@ -139,8 +139,8 @@ def test_selector_config_setters() -> None:
 
 def test_parse_recipe_with_selectors() -> None:
     """Test parsing recipe with platform selectors using existing test data"""
-    linux_config = SelectorConfig(target_platform="linux-64")
-    windows_config = SelectorConfig(target_platform="win-64")
+    linux_config = JinjaConfig(target_platform="linux-64")
+    windows_config = JinjaConfig(target_platform="win-64")
 
     recipe_linux = parse_recipe_py(TEST_RECIPE_FILE.read_text(), linux_config.config)
     recipe_windows = parse_recipe_py(TEST_RECIPE_FILE.read_text(), windows_config.config)
@@ -149,9 +149,9 @@ def test_parse_recipe_with_selectors() -> None:
     assert recipe_linux["package"]["name"] == "test-package"
     assert recipe_windows["package"]["name"] == "test-package"
 
-    # Check that we can parse both successfully - the main point is that SelectorConfig works
+    # Check that we can parse both successfully - the main point is that JinjaConfig works
     # However, as @wolf noted, the "intermediate recipe" in pixi-build will be migrating to rattler-build at some point.
-    # This would improve SelectorConfig to parse and validate while resolving selectors for different operating systems.
+    # This would improve JinjaConfig to parse and validate while resolving selectors for different operating systems.
     # For example, linux: selectors could potentially be validated on Windows.
     # But for now, this is all we can do.
     assert "requirements" in recipe_linux
@@ -162,7 +162,7 @@ def test_parse_recipe_with_selectors() -> None:
 
 def test_recipe_with_variants() -> None:
     """Test recipe parsing with variant substitution using existing test data"""
-    config = SelectorConfig(target_platform="linux-64", variant={"python": "3.11", "build_number": 1})
+    config = JinjaConfig(target_platform="linux-64", variant={"python": "3.11", "build_number": 1})
 
     recipe = parse_recipe_py(TEST_RECIPE_FILE.read_text(), config.config)
 
diff --git a/py-rattler-build/tests/unit/test_render.py b/py-rattler-build/tests/unit/test_render.py
new file mode 100644
index 000000000..ed742779b
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_render.py
@@ -0,0 +1,505 @@
+"""
+Tests for the render module - converting Stage0 to Stage1 recipes with variants.
+"""
+
+from pathlib import Path
+from inline_snapshot import snapshot
+import pytest
+from rattler_build.stage0 import Recipe
+from rattler_build.variant_config import VariantConfig
+from rattler_build.render import RenderConfig, RenderedVariant, render_recipe
+
+
+@pytest.fixture
+def test_data_dir() -> Path:
+    """Fixture providing the path to the test-data directory."""
+    # Go up from tests/unit/ to py-rattler-build/, then up to rattler-build/, then to test-data/
+    return Path(__file__).parent.parent / "data"
+
+
+def test_render_config_creation() -> None:
+    """Test RenderConfig can be created with default settings."""
+    config = RenderConfig()
+    assert config.target_platform is not None
+    assert config.build_platform is not None
+    assert config.host_platform is not None
+    assert not config.experimental
+    assert config.recipe_path is None
+
+
+def test_render_config_with_platforms() -> None:
+    """Test RenderConfig with custom platforms."""
+    config = RenderConfig(target_platform="linux-64", build_platform="linux-64", host_platform="linux-64")
+    assert config.target_platform == "linux-64"
+    assert config.build_platform == "linux-64"
+    assert config.host_platform == "linux-64"
+
+
+def test_render_config_set_context() -> None:
+    """Test setting extra context variables."""
+    config = RenderConfig()
+    config.set_context("my_var", "value")
+    config.set_context("my_bool", True)
+    config.set_context("my_number", 42)
+    config.set_context("my_list", [1, 2, 3])
+
+    # TODO: This should actually error as mixed types are not allowed
+    config.set_context("error_list", [1, "string", 3])
+
+    assert config.get_context("my_var") == "value"
+    assert config.get_context("my_bool")
+    assert isinstance(config.get_context("my_bool"), bool)
+    assert config.get_context("my_number") == 42
+    assert config.get_context("my_list") == [1, 2, 3]
+    assert config.get_context("error_list") == [1, "string", 3]
+
+    context = config.get_all_context()
+    assert context.keys() == {"my_var", "my_bool", "my_number", "my_list", "error_list"}
+
+
+def test_render_config_platform_setters() -> None:
+    """Test platform property setters."""
+    config = RenderConfig()
+    config.target_platform = "osx-arm64"
+    config.build_platform = "osx-64"
+    config.host_platform = "linux-64"
+
+    assert config.target_platform == "osx-arm64"
+    assert config.build_platform == "osx-64"
+    assert config.host_platform == "linux-64"
+
+
+def test_render_config_experimental() -> None:
+    """Test experimental flag."""
+    config = RenderConfig(experimental=True)
+    assert config.experimental
+
+    config.experimental = False
+    assert not config.experimental
+
+
+def test_render_simple_recipe() -> None:
+    """Test rendering a simple recipe without variants."""
+    recipe_yaml = """
+package:
+  name: test-package
+  version: 1.0.0
+
+build:
+  number: 0
+
+requirements:
+  host:
+    - python >=3.8
+  run:
+    - python >=3.8
+
+about:
+  summary: A test package
+  license: MIT
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    rendered = render_recipe(recipe, variant_config)
+
+    assert len(rendered) == 1
+    assert isinstance(rendered[0], RenderedVariant)
+
+
+def test_render_recipe_with_variants() -> None:
+    """Test rendering a recipe with variant configuration."""
+    recipe_yaml = """
+package:
+  name: test-package
+  version: 1.0.0
+
+requirements:
+  host:
+    - python ${{ python }}.*
+  run:
+    - python
+"""
+
+    variant_yaml = """
+python:
+  - "3.9"
+  - "3.10"
+  - "3.11"
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig.from_yaml(variant_yaml)
+
+    rendered = render_recipe(recipe, variant_config)
+
+    # Should have 3 variants (one for each Python version)
+    assert len(rendered) == 3
+
+    # Check that each variant has the correct python value
+    python_versions = {variant.variant().get("python") for variant in rendered}
+    assert python_versions == {"3.9", "3.10", "3.11"}
+
+
+def test_render_recipe_with_custom_config() -> None:
+    """Test rendering with custom render configuration."""
+    recipe_yaml = """
+package:
+  name: test-package
+  version: 1.0.0
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+    config = RenderConfig(target_platform="linux-64", experimental=True)
+
+    rendered = render_recipe(recipe, variant_config, config)
+
+    assert len(rendered) >= 1
+    # Verify the recipe was rendered
+    assert rendered[0].recipe() is not None
+
+
+def test_rendered_variant_properties() -> None:
+    """Test RenderedVariant properties."""
+    recipe_yaml = """
+package:
+  name: my-package
+  version: 1.2.3
+
+build:
+  number: 5
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    rendered = render_recipe(recipe, variant_config)
+    variant = rendered[0]
+
+    # Test variant() method
+    variant_dict = variant.variant()
+    assert isinstance(variant_dict, dict)
+
+    # Test recipe() method
+    stage1_recipe = variant.recipe()
+    assert stage1_recipe is not None
+    # Verify it's a Stage1 recipe by checking properties
+    package = stage1_recipe.package
+    assert package.name == "my-package"
+    assert str(package.version) == "1.2.3"
+
+    # Test hash_info() method
+    hash_info = variant.hash_info()
+    if hash_info is not None:
+        assert hasattr(hash_info, "hash")
+        assert hasattr(hash_info, "prefix")
+
+    # Test pin_subpackages() method
+    pin_subpackages = variant.pin_subpackages()
+    assert isinstance(pin_subpackages, dict)
+
+
+def test_render_multi_output_recipe() -> None:
+    """Test rendering a multi-output recipe."""
+    recipe_yaml = """
+schema_version: 1
+
+context:
+  name: multi-pkg
+  version: "1.0.0"
+
+recipe:
+  version: ${{ version }}
+
+outputs:
+  - package:
+      name: ${{ name }}-lib
+    build:
+      noarch: generic
+
+  - package:
+      name: ${{ name }}
+    build:
+      noarch: generic
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    rendered = render_recipe(recipe, variant_config)
+
+    # Should have 2 outputs
+    assert len(rendered) == 2
+
+    # Check package names
+    names = {variant.recipe().package.name for variant in rendered}
+    assert names == {"multi-pkg-lib", "multi-pkg"}
+
+
+def test_render_with_jinja_expressions() -> None:
+    """Test rendering with Jinja expressions."""
+    recipe_yaml = """
+package:
+  name: jinja-test
+  version: 1.0.0
+
+context:
+  my_value: "hello"
+
+build:
+  number: 0
+  script:
+    - echo "${{ my_value }}"
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    rendered = render_recipe(recipe, variant_config)
+
+    assert len(rendered) == 1
+    # Jinja should have been evaluated
+    stage1_recipe = rendered[0].recipe()
+    assert stage1_recipe is not None
+
+
+def test_render_with_free_specs() -> None:
+    """Test rendering with free specs (unversioned dependencies)."""
+    recipe_yaml = """
+package:
+  name: test-pkg
+  version: "1.0.0"
+
+requirements:
+  build:
+    - python
+"""
+
+    variant_yaml = """
+python:
+  - "3.9"
+  - "3.10"
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig.from_yaml(variant_yaml)
+
+    rendered = render_recipe(recipe, variant_config)
+
+    # Should create variants based on free spec "python"
+    assert len(rendered) == 2
+
+
+def test_render_config_repr() -> None:
+    """Test RenderConfig __repr__."""
+    config = RenderConfig(target_platform="linux-64", experimental=True)
+    repr_str = repr(config)
+    assert "RenderConfig" in repr_str
+    assert "linux-64" in repr_str
+
+
+def test_rendered_variant_repr() -> None:
+    """Test RenderedVariant __repr__."""
+    recipe_yaml = """
+package:
+  name: repr-test
+  version: 2.0.0
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    rendered = render_recipe(recipe, variant_config)
+    repr_str = repr(rendered[0])
+    assert "RenderedVariant" in repr_str
+    assert "repr-test" in repr_str
+
+
+def test_render_with_pin_subpackage() -> None:
+    """Test rendering with pin_subpackage."""
+    recipe_yaml = """
+schema_version: 1
+
+context:
+  name: my-pkg
+  version: "0.1.0"
+
+recipe:
+  version: ${{ version }}
+
+build:
+  number: 0
+
+outputs:
+  - package:
+      name: ${{ name }}
+    build:
+      noarch: generic
+
+  - package:
+      name: ${{ name }}-extra
+    build:
+      noarch: generic
+    requirements:
+      run:
+        - ${{ pin_subpackage(name, exact=true) }}
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    rendered = render_recipe(recipe, variant_config)
+
+    # Should have 2 outputs
+    assert len(rendered) == 2
+
+    # Find the -extra package
+    extra_pkg = None
+    for variant in rendered:
+        if variant.recipe().package.name == "my-pkg-extra":
+            extra_pkg = variant
+            break
+
+    assert extra_pkg is not None
+
+    # Check pin_subpackages
+    pin_subpackages = extra_pkg.pin_subpackages()
+    assert "my-pkg" in pin_subpackages or "my_pkg" in pin_subpackages
+
+
+def test_render_invalid_platform() -> None:
+    """Test that invalid platform raises error."""
+    with pytest.raises(Exception):
+        RenderConfig(target_platform="invalid-platform-name")
+
+
+def test_render_context_nonexistent_key() -> None:
+    """Test getting non-existent context key returns None."""
+    config = RenderConfig()
+    assert config.get_context("nonexistent") is None
+
+
+def test_render_recipe_with_staging(test_data_dir: Path) -> None:
+    """Test rendering a recipe with staging."""
+    recipe_path = test_data_dir / "recipes" / "with-staging.yaml"
+    recipe_yaml = recipe_path.read_text()
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+    rendered = render_recipe(recipe, variant_config)
+    assert len(rendered) == 2
+    assert isinstance(rendered[0], RenderedVariant)
+
+    assert rendered[0].recipe().package.name == "mixed-compiled"
+    assert rendered[0].recipe().package.version == "1.2.3"
+    assert len(rendered[0].recipe().staging_caches) == 1
+    assert rendered[0].recipe().about.to_dict() == snapshot(
+        {
+            "repository": "https://github.com/foobar/repo",
+            "license": "Apache-2.0",
+            "license_file": ["LICENSE"],
+            "summary": "Compiled library package",
+        }
+    )
+
+
+def test_render_recipe_from_yaml_string() -> None:
+    """Test rendering with recipe as YAML string."""
+    recipe_yaml = """
+package:
+  name: string-test
+  version: 1.0.0
+"""
+    variant_yaml = """
+python:
+  - "3.10"
+"""
+
+    # Pass recipe and variant_config as strings
+    rendered = render_recipe(recipe_yaml, variant_yaml)
+
+    assert len(rendered) >= 1
+    assert rendered[0].recipe().package.name == "string-test"
+
+
+def test_render_recipe_from_path(test_data_dir: Path) -> None:
+    """Test rendering with recipe as Path object."""
+    recipe_path = test_data_dir / "recipes" / "with-staging.yaml"
+    variant_config = VariantConfig()
+
+    # Pass recipe as Path object
+    rendered = render_recipe(recipe_path, variant_config)
+
+    assert len(rendered) == 2
+    assert rendered[0].recipe().package.name == "mixed-compiled"
+
+
+def test_render_recipe_list() -> None:
+    """Test rendering with a list of recipes."""
+    recipe1_yaml = """
+package:
+  name: pkg1
+  version: 1.0.0
+"""
+    recipe2_yaml = """
+package:
+  name: pkg2
+  version: 2.0.0
+"""
+
+    # Parse recipes
+    recipe1 = Recipe.from_yaml(recipe1_yaml)
+    recipe2 = Recipe.from_yaml(recipe2_yaml)
+
+    variant_config = VariantConfig()
+
+    # Pass list of recipes
+    rendered = render_recipe([recipe1, recipe2], variant_config)
+
+    assert len(rendered) == 2
+    names = {variant.recipe().package.name for variant in rendered}
+    assert names == {"pkg1", "pkg2"}
+
+
+def test_render_variant_config_from_yaml_string() -> None:
+    """Test rendering with variant_config as YAML string."""
+    recipe_yaml = """
+package:
+  name: test-pkg
+  version: 1.0.0
+
+requirements:
+  host:
+    - python ${{ python }}.*
+"""
+
+    variant_yaml = """
+python:
+  - "3.9"
+  - "3.10"
+"""
+
+    # Pass variant_config as string
+    rendered = render_recipe(recipe_yaml, variant_yaml)
+
+    assert len(rendered) == 2
+    python_versions = {variant.variant().get("python") for variant in rendered}
+    assert python_versions == {"3.9", "3.10"}
+
+
+def test_render_invalid_recipe_type() -> None:
+    """Test that invalid recipe type raises TypeError."""
+    with pytest.raises(TypeError, match="Unsupported recipe type"):
+        render_recipe(123, VariantConfig())  # type: ignore[arg-type]
+
+
+def test_render_invalid_variant_config_type() -> None:
+    """Test that invalid variant_config type raises TypeError."""
+    recipe_yaml = """
+package:
+  name: test
+  version: 1.0.0
+"""
+    with pytest.raises(TypeError, match="Unsupported variant_config type"):
+        render_recipe(recipe_yaml, 123)  # type: ignore[arg-type]
diff --git a/py-rattler-build/tests/unit/test_render_types.py b/py-rattler-build/tests/unit/test_render_types.py
new file mode 100644
index 000000000..0f9a179ce
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_render_types.py
@@ -0,0 +1,221 @@
+"""Tests for render module typed structures (HashInfo and PinSubpackageInfo)."""
+
+from rattler_build.render import (
+    RenderConfig,
+    render_recipe,
+)
+from rattler_build.stage0 import Recipe
+from rattler_build.variant_config import VariantConfig
+
+
+def test_hash_info_type() -> None:
+    """Test that HashInfo is a proper typed structure."""
+    # Create a simple recipe
+    recipe_yaml = """
+schema_version: 1
+package:
+  name: test-hash
+  version: "1.0.0"
+"""
+
+    # Parse recipe
+    recipe = Recipe.from_yaml(recipe_yaml)
+
+    # Create empty variant config
+    variant_config = VariantConfig()
+
+    # Render recipe
+    render_config = RenderConfig()
+    rendered = render_recipe(recipe, variant_config, render_config)
+
+    assert len(rendered) == 1
+    variant = rendered[0]
+
+    # Test hash_info - it always exists now
+    hash_info = variant.hash_info()
+
+    assert hash_info is not None
+    # Check that we can access properties like a typed object
+    assert hasattr(hash_info, "hash")
+    assert hasattr(hash_info, "prefix")
+    assert isinstance(hash_info.hash, str)
+    assert isinstance(hash_info.prefix, str)
+    # Hash should be 7 characters
+    assert len(hash_info.hash) == 7
+    print(f"Hash: {hash_info.hash}, Prefix: {hash_info.prefix}")
+
+
+def test_pin_subpackages_type() -> None:
+    """Test that PinSubpackageInfo is a proper typed structure."""
+    # Create a recipe with multiple outputs and pin_subpackage
+    recipe_yaml = """
+schema_version: 1
+recipe:
+  name: test-pin
+
+outputs:
+  - package:
+      name: test-lib
+      version: "1.0.0"
+
+  - package:
+      name: test-app
+      version: "1.0.0"
+    requirements:
+      host:
+        - ${{ pin_subpackage('test-lib', exact=True) }}
+"""
+
+    # Parse recipe
+    recipe = Recipe.from_yaml(recipe_yaml)
+
+    # Create empty variant config
+    variant_config = VariantConfig()
+
+    # Render recipe
+    render_config = RenderConfig()
+    rendered = render_recipe(recipe, variant_config, render_config)
+
+    # Find the test-app output (should have pin_subpackages)
+    app_variant = None
+    for variant in rendered:
+        recipe_obj = variant.recipe()
+        # Access package property (not method)
+        if recipe_obj.package.name == "test-app":
+            app_variant = variant
+            break
+
+    assert app_variant is not None, "test-app variant not found"
+
+    # Test pin_subpackages
+    pin_subpackages = app_variant.pin_subpackages()
+
+    assert isinstance(pin_subpackages, dict)
+
+    # Check that we have the test-lib pin
+    if "test-lib" in pin_subpackages:
+        pin_info = pin_subpackages["test-lib"]
+
+        # Check that we can access properties like a typed object
+        assert hasattr(pin_info, "name")
+        assert hasattr(pin_info, "version")
+        assert hasattr(pin_info, "build_string")
+        assert hasattr(pin_info, "exact")
+
+        assert isinstance(pin_info.name, str)
+        assert isinstance(pin_info.version, str)
+        assert isinstance(pin_info.exact, bool)
+
+        # Since we used exact=True, this should be True
+        assert pin_info.exact is True
+        assert pin_info.name == "test-lib"
+        assert pin_info.version == "1.0.0"
+
+        print(f"Pin info - name: {pin_info.name}, version: {pin_info.version}, exact: {pin_info.exact}")
+
+
+def test_hash_info_repr() -> None:
+    """Test the __repr__ of HashInfo."""
+    recipe_yaml = """
+schema_version: 1
+package:
+  name: test-repr
+  version: "1.0.0"
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    render_config = RenderConfig()
+    rendered = render_recipe(recipe, variant_config, render_config)
+
+    hash_info = rendered[0].hash_info()
+    if hash_info is not None:
+        repr_str = repr(hash_info)
+        assert "HashInfo" in repr_str
+        assert "hash=" in repr_str
+        assert "prefix=" in repr_str
+        print(f"HashInfo repr: {repr_str}")
+
+
+def test_pin_subpackage_info_repr() -> None:
+    """Test the __repr__ of PinSubpackageInfo."""
+    recipe_yaml = """
+schema_version: 1
+recipe:
+  name: test-pin-repr
+
+outputs:
+  - package:
+      name: lib
+      version: "2.0.0"
+
+  - package:
+      name: app
+      version: "2.0.0"
+    requirements:
+      host:
+        - ${{ pin_subpackage('lib', upper_bound='x.x') }}
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    render_config = RenderConfig()
+    rendered = render_recipe(recipe, variant_config, render_config)
+
+    # Find app output
+    for variant in rendered:
+        if variant.recipe().package.name == "app":
+            pin_subpackages = variant.pin_subpackages()
+            if "lib" in pin_subpackages:
+                pin_info = pin_subpackages["lib"]
+                repr_str = repr(pin_info)
+                assert "PinSubpackageInfo" in repr_str
+                assert "name=" in repr_str
+                assert "version=" in repr_str
+                assert "exact=" in repr_str
+                print(f"PinSubpackageInfo repr: {repr_str}")
+                break
+
+
+def test_hash_info_always_present() -> None:
+    """Test that hash_info is always present."""
+    recipe_yaml = """
+schema_version: 1
+package:
+  name: simple-package
+  version: "1.0.0"
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    render_config = RenderConfig()
+    rendered = render_recipe(recipe, variant_config, render_config)
+
+    hash_info = rendered[0].hash_info()
+    # Hash info is always present
+    assert hash_info is not None
+    assert isinstance(hash_info.hash, str)
+    assert len(hash_info.hash) == 7
+
+
+def test_empty_pin_subpackages() -> None:
+    """Test that pin_subpackages returns empty dict when no pins are present."""
+    recipe_yaml = """
+schema_version: 1
+package:
+  name: no-pins
+  version: "1.0.0"
+"""
+
+    recipe = Recipe.from_yaml(recipe_yaml)
+    variant_config = VariantConfig()
+
+    render_config = RenderConfig()
+    rendered = render_recipe(recipe, variant_config, render_config)
+
+    pin_subpackages = rendered[0].pin_subpackages()
+    assert isinstance(pin_subpackages, dict)
+    assert len(pin_subpackages) == 0
diff --git a/py-rattler-build/tests/unit/test_stage0_bindings.py b/py-rattler-build/tests/unit/test_stage0_bindings.py
new file mode 100644
index 000000000..f45c88848
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_stage0_bindings.py
@@ -0,0 +1,718 @@
+"""Tests for Stage0 Python bindings."""
+
+import pytest
+from inline_snapshot import snapshot
+from rattler_build.stage0 import Recipe, SingleOutputRecipe, MultiOutputRecipe
+
+
+# Sample YAML recipes for testing
+SIMPLE_RECIPE_YAML = """
+package:
+  name: test-package
+  version: 1.0.0
+
+build:
+  number: 0
+
+requirements:
+  host:
+    - python
+  run:
+    - python
+
+about:
+  summary: A test package
+  license: MIT
+"""
+
+MULTI_OUTPUT_RECIPE_YAML = """
+recipe:
+  name: test-multi
+  version: 1.0.0
+
+build:
+  number: 0
+
+outputs:
+  - package:
+      name: test-multi-lib
+    requirements:
+      run:
+        - libtest
+    
+  - package:
+      name: test-multi-dev
+    requirements:
+      run:
+        - test-multi-lib
+
+about:
+  summary: A multi-output test package
+  license: MIT
+"""
+
+
+def test_recipe_from_yaml_single_output() -> None:
+    """Test parsing a single-output recipe from YAML."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+
+    assert recipe is not None
+    assert isinstance(recipe, SingleOutputRecipe)
+    assert not isinstance(recipe, MultiOutputRecipe)
+
+
+def test_recipe_from_yaml_multi_output() -> None:
+    """Test parsing a multi-output recipe from YAML."""
+    recipe = Recipe.from_yaml(MULTI_OUTPUT_RECIPE_YAML)
+
+    assert recipe is not None
+    assert isinstance(recipe, MultiOutputRecipe)
+    assert not isinstance(recipe, SingleOutputRecipe)
+
+
+def test_recipe_to_dict() -> None:
+    """Test converting recipe to dictionary."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+
+    recipe_dict = recipe.to_dict()
+    assert isinstance(recipe_dict, dict)
+    assert "package" in recipe_dict
+
+
+def test_recipe_to_dict_snapshot() -> None:
+    """Test recipe serialization with snapshot."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+
+    recipe_dict = recipe.to_dict()
+    # The snapshot will capture the exact structure
+    assert recipe_dict == snapshot(
+        {
+            "package": {"name": "test-package", "version": "1.0.0"},
+            "build": {
+                "number": 0,
+                "string": None,
+                "script": {},
+                "noarch": None,
+                "python": {
+                    "entry_points": [],
+                    "skip_pyc_compilation": [],
+                    "use_python_app_entrypoint": False,
+                    "version_independent": False,
+                    "site_packages_path": None,
+                },
+                "skip": [],
+                "always_copy_files": [],
+                "always_include_files": [],
+                "merge_build_and_host_envs": False,
+                "files": [],
+                "dynamic_linking": {
+                    "rpaths": [],
+                    "binary_relocation": True,
+                    "missing_dso_allowlist": [],
+                    "rpath_allowlist": [],
+                    "overdepending_behavior": None,
+                    "overlinking_behavior": None,
+                },
+                "variant": {
+                    "use_keys": [],
+                    "ignore_keys": [],
+                    "down_prioritize_variant": None,
+                },
+                "prefix_detection": {
+                    "force_file_type": {"text": [], "binary": []},
+                    "ignore": False,
+                    "ignore_binary_files": False,
+                },
+                "post_process": [],
+            },
+            "requirements": {"host": ["python"], "run": ["python"]},
+            "about": {
+                "homepage": None,
+                "license": "MIT",
+                "license_family": None,
+                "summary": "A test package",
+                "description": None,
+                "documentation": None,
+                "repository": None,
+            },
+            "extra": {},
+        }
+    )
+
+
+def test_single_output_recipe_package() -> None:
+    """Test accessing package info from single-output recipe."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+
+    assert isinstance(recipe, SingleOutputRecipe)
+    assert recipe.package is not None
+    assert recipe.build is not None
+    assert recipe.requirements is not None
+    assert recipe.about is not None
+
+    # TODO: decide if we want to keep context a dictionary
+    context = recipe.context
+    assert isinstance(context, dict)
+
+
+def test_single_output_recipe_to_dict() -> None:
+    """Test converting single-output recipe to dict."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+    recipe_dict = recipe.to_dict()
+    assert isinstance(recipe_dict, dict)
+    assert "package" in recipe_dict
+
+
+def test_single_output_recipe_to_dict_snapshot() -> None:
+    """Test single-output recipe serialization with snapshot."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+    recipe_dict = recipe.to_dict()
+
+    # Snapshot the full structure
+    assert recipe_dict == snapshot(
+        {
+            "package": {"name": "test-package", "version": "1.0.0"},
+            "build": {
+                "number": 0,
+                "string": None,
+                "script": {},
+                "noarch": None,
+                "python": {
+                    "entry_points": [],
+                    "skip_pyc_compilation": [],
+                    "use_python_app_entrypoint": False,
+                    "version_independent": False,
+                    "site_packages_path": None,
+                },
+                "skip": [],
+                "always_copy_files": [],
+                "always_include_files": [],
+                "merge_build_and_host_envs": False,
+                "files": [],
+                "dynamic_linking": {
+                    "rpaths": [],
+                    "binary_relocation": True,
+                    "missing_dso_allowlist": [],
+                    "rpath_allowlist": [],
+                    "overdepending_behavior": None,
+                    "overlinking_behavior": None,
+                },
+                "variant": {
+                    "use_keys": [],
+                    "ignore_keys": [],
+                    "down_prioritize_variant": None,
+                },
+                "prefix_detection": {
+                    "force_file_type": {"text": [], "binary": []},
+                    "ignore": False,
+                    "ignore_binary_files": False,
+                },
+                "post_process": [],
+            },
+            "requirements": {"host": ["python"], "run": ["python"]},
+            "about": {
+                "homepage": None,
+                "license": "MIT",
+                "license_family": None,
+                "summary": "A test package",
+                "description": None,
+                "documentation": None,
+                "repository": None,
+            },
+            "extra": {},
+        }
+    )
+
+
+def test_multi_output_recipe_about() -> None:
+    """Test accessing about from multi-output recipe."""
+    recipe = Recipe.from_yaml(MULTI_OUTPUT_RECIPE_YAML)
+
+    assert isinstance(recipe, MultiOutputRecipe)
+    assert isinstance(recipe.outputs, list)
+    assert len(recipe.outputs) == 2
+
+    assert recipe.recipe is not None
+    assert recipe.about is not None
+    assert recipe.build is not None
+
+    context = recipe.context
+    assert isinstance(context, dict)
+
+
+def test_multi_output_recipe_to_dict() -> None:
+    """Test converting multi-output recipe to dict."""
+    recipe = Recipe.from_yaml(MULTI_OUTPUT_RECIPE_YAML)
+    recipe_dict = recipe.to_dict()
+    assert isinstance(recipe_dict, dict)
+    assert "recipe" in recipe_dict or "outputs" in recipe_dict
+
+
+def test_multi_output_recipe_to_dict_snapshot() -> None:
+    """Test multi-output recipe serialization with snapshot."""
+    recipe = Recipe.from_yaml(MULTI_OUTPUT_RECIPE_YAML)
+
+    # Snapshot the full structure including all outputs
+    assert recipe.to_dict() == snapshot(
+        {
+            "recipe": {"name": "test-multi", "version": "1.0.0"},
+            "build": {
+                "number": 0,
+                "string": None,
+                "script": {},
+                "noarch": None,
+                "python": {
+                    "entry_points": [],
+                    "skip_pyc_compilation": [],
+                    "use_python_app_entrypoint": False,
+                    "version_independent": False,
+                    "site_packages_path": None,
+                },
+                "skip": [],
+                "always_copy_files": [],
+                "always_include_files": [],
+                "merge_build_and_host_envs": False,
+                "files": [],
+                "dynamic_linking": {
+                    "rpaths": [],
+                    "binary_relocation": True,
+                    "missing_dso_allowlist": [],
+                    "rpath_allowlist": [],
+                    "overdepending_behavior": None,
+                    "overlinking_behavior": None,
+                },
+                "variant": {
+                    "use_keys": [],
+                    "ignore_keys": [],
+                    "down_prioritize_variant": None,
+                },
+                "prefix_detection": {
+                    "force_file_type": {"text": [], "binary": []},
+                    "ignore": False,
+                    "ignore_binary_files": False,
+                },
+                "post_process": [],
+            },
+            "about": {
+                "homepage": None,
+                "license": "MIT",
+                "license_family": None,
+                "summary": "A multi-output test package",
+                "description": None,
+                "documentation": None,
+                "repository": None,
+            },
+            "extra": {},
+            "outputs": [
+                {
+                    "package": {"name": "test-multi-lib"},
+                    "inherit": None,
+                    "requirements": {"run": ["libtest"]},
+                    "build": {
+                        "number": 0,
+                        "string": None,
+                        "script": {},
+                        "noarch": None,
+                        "python": {
+                            "entry_points": [],
+                            "skip_pyc_compilation": [],
+                            "use_python_app_entrypoint": False,
+                            "version_independent": False,
+                            "site_packages_path": None,
+                        },
+                        "skip": [],
+                        "always_copy_files": [],
+                        "always_include_files": [],
+                        "merge_build_and_host_envs": False,
+                        "files": [],
+                        "dynamic_linking": {
+                            "rpaths": [],
+                            "binary_relocation": True,
+                            "missing_dso_allowlist": [],
+                            "rpath_allowlist": [],
+                            "overdepending_behavior": None,
+                            "overlinking_behavior": None,
+                        },
+                        "variant": {
+                            "use_keys": [],
+                            "ignore_keys": [],
+                            "down_prioritize_variant": None,
+                        },
+                        "prefix_detection": {
+                            "force_file_type": {"text": [], "binary": []},
+                            "ignore": False,
+                            "ignore_binary_files": False,
+                        },
+                        "post_process": [],
+                    },
+                    "about": {
+                        "homepage": None,
+                        "license": None,
+                        "license_family": None,
+                        "summary": None,
+                        "description": None,
+                        "documentation": None,
+                        "repository": None,
+                    },
+                },
+                {
+                    "package": {"name": "test-multi-dev"},
+                    "inherit": None,
+                    "requirements": {"run": ["test-multi-lib"]},
+                    "build": {
+                        "number": 0,
+                        "string": None,
+                        "script": {},
+                        "noarch": None,
+                        "python": {
+                            "entry_points": [],
+                            "skip_pyc_compilation": [],
+                            "use_python_app_entrypoint": False,
+                            "version_independent": False,
+                            "site_packages_path": None,
+                        },
+                        "skip": [],
+                        "always_copy_files": [],
+                        "always_include_files": [],
+                        "merge_build_and_host_envs": False,
+                        "files": [],
+                        "dynamic_linking": {
+                            "rpaths": [],
+                            "binary_relocation": True,
+                            "missing_dso_allowlist": [],
+                            "rpath_allowlist": [],
+                            "overdepending_behavior": None,
+                            "overlinking_behavior": None,
+                        },
+                        "variant": {
+                            "use_keys": [],
+                            "ignore_keys": [],
+                            "down_prioritize_variant": None,
+                        },
+                        "prefix_detection": {
+                            "force_file_type": {"text": [], "binary": []},
+                            "ignore": False,
+                            "ignore_binary_files": False,
+                        },
+                        "post_process": [],
+                    },
+                    "about": {
+                        "homepage": None,
+                        "license": None,
+                        "license_family": None,
+                        "summary": None,
+                        "description": None,
+                        "documentation": None,
+                        "repository": None,
+                    },
+                },
+            ],
+        }
+    )
+
+
+def test_package_to_dict() -> None:
+    """Test converting package to dict."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+    assert isinstance(recipe, SingleOutputRecipe)
+    package = recipe.package
+    package_dict = package.to_dict()
+    assert isinstance(package_dict, dict)
+
+
+def test_package_to_dict_snapshot() -> None:
+    """Test package serialization with snapshot."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+    assert isinstance(recipe, SingleOutputRecipe)
+
+    package = recipe.package
+    package_dict = package.to_dict()
+
+    # Snapshot should capture name and version
+    assert package_dict == snapshot({"name": "test-package", "version": "1.0.0"})
+
+
+def test_build_to_dict_snapshot() -> None:
+    """Test build serialization with snapshot."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+    assert isinstance(recipe, SingleOutputRecipe)
+
+    build = recipe.build
+    build_dict = build.to_dict()
+
+    # Snapshot should capture build number and other build settings
+    assert build_dict == snapshot(
+        {
+            "number": 0,
+            "string": None,
+            "script": {},
+            "noarch": None,
+            "python": {
+                "entry_points": [],
+                "skip_pyc_compilation": [],
+                "use_python_app_entrypoint": False,
+                "version_independent": False,
+                "site_packages_path": None,
+            },
+            "skip": [],
+            "always_copy_files": [],
+            "always_include_files": [],
+            "merge_build_and_host_envs": False,
+            "files": [],
+            "dynamic_linking": {
+                "rpaths": [],
+                "binary_relocation": True,
+                "missing_dso_allowlist": [],
+                "rpath_allowlist": [],
+                "overdepending_behavior": None,
+                "overlinking_behavior": None,
+            },
+            "variant": {
+                "use_keys": [],
+                "ignore_keys": [],
+                "down_prioritize_variant": None,
+            },
+            "prefix_detection": {
+                "force_file_type": {"text": [], "binary": []},
+                "ignore": False,
+                "ignore_binary_files": False,
+            },
+            "post_process": [],
+        }
+    )
+
+
+def test_requirements_to_dict_snapshot() -> None:
+    """Test requirements serialization with snapshot."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+    assert isinstance(recipe, SingleOutputRecipe)
+
+    requirements = recipe.requirements
+    requirements_dict = requirements.to_dict()
+
+    # Snapshot should capture host and run dependencies
+    assert requirements_dict == snapshot({"host": ["python"], "run": ["python"]})
+
+
+def test_about_to_dict_snapshot() -> None:
+    """Test about serialization with snapshot."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+    assert isinstance(recipe, SingleOutputRecipe)
+
+    about = recipe.about
+    about_dict = about.to_dict()
+
+    # Snapshot should capture summary and license
+    assert about_dict == snapshot(
+        {
+            "homepage": None,
+            "license": "MIT",
+            "license_family": None,
+            "summary": "A test package",
+            "description": None,
+            "documentation": None,
+            "repository": None,
+        }
+    )
+
+
+def test_recipe_with_context() -> None:
+    """Test recipe with Jinja context variables."""
+    yaml_with_context = """
+context:
+  version: 1.2.3
+
+package:
+  name: test-package
+  version: ${{ version }}
+
+build:
+  number: 0
+"""
+
+    recipe = Recipe.from_yaml(yaml_with_context)
+    context = recipe.context
+    assert len(context) > 0
+
+
+def test_invalid_yaml() -> None:
+    """Test that invalid YAML raises an error."""
+    invalid_yaml = """
+    this is not: [valid yaml
+    """
+
+    with pytest.raises(Exception):  # Should raise some parsing error
+        Recipe.from_yaml(invalid_yaml)
+
+
+def test_recipe_repr() -> None:
+    """Test recipe string representation."""
+    recipe = Recipe.from_yaml(SIMPLE_RECIPE_YAML)
+
+    repr_str = repr(recipe)
+    assert "Stage0Recipe" in repr_str or "Recipe" in repr_str
+
+
+def test_multi_output_outputs_snapshot() -> None:
+    """Test multi-output recipe outputs structure with snapshot."""
+    recipe = Recipe.from_yaml(MULTI_OUTPUT_RECIPE_YAML)
+    assert isinstance(recipe, MultiOutputRecipe)
+    outputs = recipe.outputs
+
+    # Convert outputs to serializable format for snapshot
+    outputs_data = []
+    for output in outputs:
+        outputs_data.append(output.to_dict())
+
+    # Snapshot should capture all output configurations
+    assert outputs_data == snapshot(
+        [
+            {
+                "package": {"name": "test-multi-lib"},
+                "inherit": None,
+                "requirements": {"run": ["libtest"]},
+                "build": {
+                    "number": 0,
+                    "string": None,
+                    "script": {},
+                    "noarch": None,
+                    "python": {
+                        "entry_points": [],
+                        "skip_pyc_compilation": [],
+                        "use_python_app_entrypoint": False,
+                        "version_independent": False,
+                        "site_packages_path": None,
+                    },
+                    "skip": [],
+                    "always_copy_files": [],
+                    "always_include_files": [],
+                    "merge_build_and_host_envs": False,
+                    "files": [],
+                    "dynamic_linking": {
+                        "rpaths": [],
+                        "binary_relocation": True,
+                        "missing_dso_allowlist": [],
+                        "rpath_allowlist": [],
+                        "overdepending_behavior": None,
+                        "overlinking_behavior": None,
+                    },
+                    "variant": {
+                        "use_keys": [],
+                        "ignore_keys": [],
+                        "down_prioritize_variant": None,
+                    },
+                    "prefix_detection": {
+                        "force_file_type": {"text": [], "binary": []},
+                        "ignore": False,
+                        "ignore_binary_files": False,
+                    },
+                    "post_process": [],
+                },
+                "about": {
+                    "homepage": None,
+                    "license": None,
+                    "license_family": None,
+                    "summary": None,
+                    "description": None,
+                    "documentation": None,
+                    "repository": None,
+                },
+            },
+            {
+                "package": {"name": "test-multi-dev"},
+                "inherit": None,
+                "requirements": {"run": ["test-multi-lib"]},
+                "build": {
+                    "number": 0,
+                    "string": None,
+                    "script": {},
+                    "noarch": None,
+                    "python": {
+                        "entry_points": [],
+                        "skip_pyc_compilation": [],
+                        "use_python_app_entrypoint": False,
+                        "version_independent": False,
+                        "site_packages_path": None,
+                    },
+                    "skip": [],
+                    "always_copy_files": [],
+                    "always_include_files": [],
+                    "merge_build_and_host_envs": False,
+                    "files": [],
+                    "dynamic_linking": {
+                        "rpaths": [],
+                        "binary_relocation": True,
+                        "missing_dso_allowlist": [],
+                        "rpath_allowlist": [],
+                        "overdepending_behavior": None,
+                        "overlinking_behavior": None,
+                    },
+                    "variant": {
+                        "use_keys": [],
+                        "ignore_keys": [],
+                        "down_prioritize_variant": None,
+                    },
+                    "prefix_detection": {
+                        "force_file_type": {"text": [], "binary": []},
+                        "ignore": False,
+                        "ignore_binary_files": False,
+                    },
+                    "post_process": [],
+                },
+                "about": {
+                    "homepage": None,
+                    "license": None,
+                    "license_family": None,
+                    "summary": None,
+                    "description": None,
+                    "documentation": None,
+                    "repository": None,
+                },
+            },
+        ]
+    )
+
+
+def test_context_with_jinja_snapshot() -> None:
+    """Test recipe context with Jinja variables using snapshot."""
+    yaml_with_context = """
+context:
+  version: 1.2.3
+  name: my-package
+
+package:
+  name: ${{ name }}
+  version: ${{ version }}
+
+requirements:
+  build:
+    - if: win
+      then:
+        - vc2019
+      else:
+        - gcc
+    - ${{ compiler('cxx' )}}
+  run:
+    - ${{ "pywin32" if win }}
+
+build:
+  number: 0
+"""
+
+    recipe = Recipe.from_yaml(yaml_with_context)
+    assert isinstance(recipe, SingleOutputRecipe)
+
+    # Snapshot the context structure
+    assert recipe.context == snapshot({"version": "1.2.3", "name": "my-package"})
+    # Jinja should stay jinja in the stage0 recipe
+    assert recipe.package.to_dict() == snapshot({"name": "${{ name }}", "version": "${{ version }}"})
+
+    assert recipe.requirements.to_dict() == snapshot(
+        {
+            "build": [
+                {"if": "win", "then": "vc2019", "else": "gcc"},
+                "${{ compiler('cxx' )}}",
+            ],
+            "run": ['${{ "pywin32" if win }}'],
+        }
+    )
diff --git a/py-rattler-build/tests/unit/test_stage1_bindings.py b/py-rattler-build/tests/unit/test_stage1_bindings.py
new file mode 100644
index 000000000..cd1f2191b
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_stage1_bindings.py
@@ -0,0 +1,268 @@
+"""Tests for Stage1 Python bindings.
+
+Note: Stage1 recipes are fully evaluated recipes. These tests focus on the API surface
+since creating Stage1 recipes requires the full evaluation pipeline which is tested
+elsewhere.
+"""
+
+from inline_snapshot import snapshot
+from rattler_build import stage1
+
+
+def test_stage1_module_exports() -> None:
+    """Test that stage1 module exports expected classes."""
+    assert hasattr(stage1, "Recipe")
+    assert hasattr(stage1, "Package")
+    assert hasattr(stage1, "Build")
+    assert hasattr(stage1, "Requirements")
+    assert hasattr(stage1, "About")
+    assert hasattr(stage1, "Source")
+    assert hasattr(stage1, "StagingCache")
+
+
+def test_stage1_recipe_type_annotations() -> None:
+    """Test that Recipe class has proper type annotations."""
+
+    # Check that the class can be used for type annotations
+    def accepts_recipe(recipe: stage1.Recipe) -> None:
+        pass
+
+    # This should not raise a type error
+    assert callable(accepts_recipe)
+
+
+def test_stage1_package_type_annotations() -> None:
+    """Test that Package class has proper type annotations."""
+
+    def accepts_package(package: stage1.Package) -> None:
+        pass
+
+    assert callable(accepts_package)
+
+
+def test_stage1_build_type_annotations() -> None:
+    """Test that Build class has proper type annotations."""
+
+    def accepts_build(build: stage1.Build) -> None:
+        pass
+
+    assert callable(accepts_build)
+
+
+def test_stage1_requirements_type_annotations() -> None:
+    """Test that Requirements class has proper type annotations."""
+
+    def accepts_requirements(requirements: stage1.Requirements) -> None:
+        pass
+
+    assert callable(accepts_requirements)
+
+
+def test_stage1_about_type_annotations() -> None:
+    """Test that About class has proper type annotations."""
+
+    def accepts_about(about: stage1.About) -> None:
+        pass
+
+    assert callable(accepts_about)
+
+
+def test_stage1_source_type_annotations() -> None:
+    """Test that Source class has proper type annotations."""
+
+    def accepts_source(source: stage1.Source) -> None:
+        pass
+
+    assert callable(accepts_source)
+
+
+def test_stage1_staging_cache_type_annotations() -> None:
+    """Test that StagingCache class has proper type annotations."""
+
+    def accepts_staging_cache(cache: stage1.StagingCache) -> None:
+        pass
+
+    assert callable(accepts_staging_cache)
+
+
+def test_stage1_recipe_wrapper_structure() -> None:
+    """Test that Recipe wrapper has expected methods."""
+    # The Recipe class should have these methods based on the implementation
+    expected_methods = [
+        "package",
+        "build",
+        "requirements",
+        "about",
+        "context",
+        "used_variant",
+        "sources",
+        "staging_caches",
+        "inherits_from",
+        "to_dict",
+    ]
+
+    for method in expected_methods:
+        assert hasattr(stage1.Recipe, method), f"Recipe should have {method} method/property"
+
+
+def test_stage1_package_wrapper_structure() -> None:
+    """Test that Package wrapper has expected methods."""
+    expected_methods = ["name", "version", "to_dict"]
+
+    for method in expected_methods:
+        assert hasattr(stage1.Package, method), f"Package should have {method} method/property"
+
+
+def test_stage1_build_wrapper_structure() -> None:
+    """Test that Build wrapper has expected methods."""
+    expected_methods = ["number", "string", "script", "noarch", "to_dict"]
+
+    for method in expected_methods:
+        assert hasattr(stage1.Build, method), f"Build should have {method} method/property"
+
+
+def test_stage1_requirements_wrapper_structure() -> None:
+    """Test that Requirements wrapper has expected methods."""
+    expected_methods = ["build", "host", "run", "to_dict"]
+
+    for method in expected_methods:
+        assert hasattr(stage1.Requirements, method), f"Requirements should have {method} method/property"
+
+
+def test_stage1_about_wrapper_structure() -> None:
+    """Test that About wrapper has expected methods."""
+    expected_methods = ["homepage", "repository", "documentation", "license", "summary", "description", "to_dict"]
+
+    for method in expected_methods:
+        assert hasattr(stage1.About, method), f"About should have {method} method/property"
+
+
+def test_stage1_source_wrapper_structure() -> None:
+    """Test that Source wrapper has expected methods."""
+    expected_methods = ["to_dict"]
+
+    for method in expected_methods:
+        assert hasattr(stage1.Source, method), f"Source should have {method} method/property"
+
+
+def test_stage1_staging_cache_wrapper_structure() -> None:
+    """Test that StagingCache wrapper has expected methods."""
+    expected_methods = ["name", "build", "requirements", "to_dict"]
+
+    for method in expected_methods:
+        assert hasattr(stage1.StagingCache, method), f"StagingCache should have {method} method/property"
+
+
+def test_stage1_wrapper_classes_exist() -> None:
+    """Test that wrapper classes are properly defined."""
+    # Try to access the classes - this will fail if they're not properly imported
+    assert stage1.Recipe is not None
+    assert stage1.Package is not None
+    assert stage1.Build is not None
+    assert stage1.Requirements is not None
+    assert stage1.About is not None
+    assert stage1.Source is not None
+    assert stage1.StagingCache is not None
+
+
+# Integration tests would require a full build pipeline
+# These would test actual Stage1 recipe creation and manipulation
+# For now, we focus on the API surface and type safety
+
+
+def test_stage1_module_structure_snapshot() -> None:
+    """Test the stage1 module structure with snapshot."""
+    # Get all public exports from stage1 module
+    exports = [name for name in dir(stage1) if not name.startswith("_")]
+
+    # Snapshot the module structure to catch any API changes
+    assert sorted(exports) == snapshot(
+        [
+            "About",
+            "Any",
+            "Build",
+            "Dict",
+            "List",
+            "Optional",
+            "Package",
+            "Recipe",
+            "Requirements",
+            "Source",
+            "StagingCache",
+            "TYPE_CHECKING",
+        ]
+    )
+
+
+def test_stage1_recipe_properties_snapshot() -> None:
+    """Test Recipe class properties with snapshot."""
+    # Get all public properties and methods
+    recipe_attrs = [name for name in dir(stage1.Recipe) if not name.startswith("_")]
+
+    # Snapshot to ensure API stability
+    assert sorted(recipe_attrs) == snapshot(
+        [
+            "about",
+            "build",
+            "context",
+            "inherits_from",
+            "package",
+            "requirements",
+            "sources",
+            "staging_caches",
+            "to_dict",
+            "used_variant",
+        ]
+    )
+
+
+def test_stage1_package_properties_snapshot() -> None:
+    """Test Package class properties with snapshot."""
+    package_attrs = [name for name in dir(stage1.Package) if not name.startswith("_")]
+
+    assert sorted(package_attrs) == snapshot(["name", "to_dict", "version"])
+
+
+def test_stage1_build_properties_snapshot() -> None:
+    """Test Build class properties with snapshot."""
+    build_attrs = [name for name in dir(stage1.Build) if not name.startswith("_")]
+
+    assert sorted(build_attrs) == snapshot(["noarch", "number", "script", "string", "to_dict"])
+
+
+def test_stage1_requirements_properties_snapshot() -> None:
+    """Test Requirements class properties with snapshot."""
+    requirements_attrs = [name for name in dir(stage1.Requirements) if not name.startswith("_")]
+
+    assert sorted(requirements_attrs) == snapshot(["build", "host", "run", "to_dict"])
+
+
+def test_stage1_about_properties_snapshot() -> None:
+    """Test About class properties with snapshot."""
+    about_attrs = [name for name in dir(stage1.About) if not name.startswith("_")]
+
+    assert sorted(about_attrs) == snapshot(
+        [
+            "description",
+            "documentation",
+            "homepage",
+            "license",
+            "repository",
+            "summary",
+            "to_dict",
+        ]
+    )
+
+
+def test_stage1_source_properties_snapshot() -> None:
+    """Test Source class properties with snapshot."""
+    source_attrs = [name for name in dir(stage1.Source) if not name.startswith("_")]
+
+    assert sorted(source_attrs) == snapshot(["to_dict"])
+
+
+def test_stage1_staging_cache_properties_snapshot() -> None:
+    """Test StagingCache class properties with snapshot."""
+    cache_attrs = [name for name in dir(stage1.StagingCache) if not name.startswith("_")]
+
+    assert sorted(cache_attrs) == snapshot(["build", "name", "requirements", "to_dict"])
diff --git a/py-rattler-build/tests/unit/test_upload.py b/py-rattler-build/tests/unit/test_upload.py
new file mode 100644
index 000000000..e62b0e59c
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_upload.py
@@ -0,0 +1,49 @@
+import os
+
+import pytest
+
+import rattler_build
+
+
+@pytest.mark.skipif(not os.getenv("CI"), reason="Only run on CI")
+def test_upload_to_quetz_no_token() -> None:
+    url = "https://quetz.io"
+    channel = "some_channel"
+    with pytest.raises(rattler_build.RattlerBuildError, match="No quetz api key was given"):
+        rattler_build.upload_package_to_quetz([], url, channel)
+
+
+@pytest.mark.skipif(not os.getenv("CI"), reason="Only run on CI")
+def test_upload_to_artifactory_no_token() -> None:
+    url = "https://artifactory.io"
+    channel = "some_channel"
+    with pytest.raises(rattler_build.RattlerBuildError, match="No bearer token was given"):
+        rattler_build.upload_package_to_artifactory([], url, channel)
+
+
+@pytest.mark.skipif(not os.getenv("CI"), reason="Only run on CI")
+def test_upload_to_prefix_no_token() -> None:
+    url = "https://prefix.dev"
+    channel = "some_channel"
+    with pytest.raises(rattler_build.RattlerBuildError, match="No prefix.dev api key was given"):
+        rattler_build.upload_package_to_prefix([], url, channel)
+
+
+@pytest.mark.skipif(not os.getenv("CI"), reason="Only run on CI")
+def test_upload_to_anaconda_no_token() -> None:
+    url = "https://anaconda.org"
+    with pytest.raises(rattler_build.RattlerBuildError, match="No anaconda.org api key was given"):
+        rattler_build.upload_package_to_anaconda([], url)
+
+
+@pytest.mark.skipif(not os.getenv("CI"), reason="Only run on CI")
+def test_upload_packages_to_conda_forge_invalid_url() -> None:
+    staging_token = "xxx"
+    feedstock = "some_feedstock"
+    feedstock_token = "xxx"
+    anaconda_url = "invalid-url"
+
+    with pytest.raises(rattler_build.RattlerBuildError, match="relative URL without a base"):
+        rattler_build.upload_packages_to_conda_forge(
+            [], staging_token, feedstock, feedstock_token, anaconda_url=anaconda_url
+        )
diff --git a/py-rattler-build/tests/unit/test_variant_config.py b/py-rattler-build/tests/unit/test_variant_config.py
new file mode 100644
index 000000000..4b93a8ebc
--- /dev/null
+++ b/py-rattler-build/tests/unit/test_variant_config.py
@@ -0,0 +1,410 @@
+"""Tests for VariantConfig Python bindings."""
+
+import tempfile
+from pathlib import Path
+from rattler_build.variant_config import VariantConfig
+
+
+def test_variant_config_creation() -> None:
+    """Test creating an empty VariantConfig."""
+    config = VariantConfig()
+    assert len(config) == 0
+
+
+def test_variant_config_set_values() -> None:
+    """Test setting variant values."""
+    config = VariantConfig()
+
+    # Set some variant values
+    config.set_values("python", ["3.8", "3.9", "3.10"])
+    config.set_values("numpy", ["1.21", "1.22"])
+
+    # Check that keys were added
+    keys = config.keys()
+    assert "python" in keys
+    assert "numpy" in keys
+    assert len(config) == 2
+
+
+def test_variant_config_get_values() -> None:
+    """Test getting variant values."""
+    config = VariantConfig()
+
+    config.set_values("python", ["3.9", "3.10", "3.11"])
+
+    values = config.get_values("python")
+    assert values is not None
+    assert len(values) == 3
+
+
+def test_variant_config_get_nonexistent_key() -> None:
+    """Test getting values for a key that doesn't exist."""
+    config = VariantConfig()
+
+    values = config.get_values("nonexistent")
+    assert values is None
+
+
+def test_variant_config_to_dict() -> None:
+    """Test converting VariantConfig to dictionary."""
+    config = VariantConfig()
+
+    config.set_values("python", ["3.10", "3.11"])
+    config.set_values("rust", ["1.70", "1.71"])
+
+    config_dict = config.to_dict()
+    assert isinstance(config_dict, dict)
+    assert "python" in config_dict
+    assert "rust" in config_dict
+
+
+def test_variant_config_merge() -> None:
+    """Test merging two VariantConfigs."""
+    config1 = VariantConfig()
+    config1.set_values("python", ["3.9", "3.10"])
+
+    config2 = VariantConfig()
+    config2.set_values("numpy", ["1.21", "1.22"])
+    config2.set_values("cuda", ["11.8", "12.0"])
+
+    # Merge config2 into config1
+    config1.merge(config2)
+
+    # Check that config1 now has all keys
+    keys = config1.keys()
+    assert "python" in keys
+    assert "numpy" in keys
+    assert "cuda" in keys
+
+
+def test_variant_config_combinations() -> None:
+    """Test generating variant combinations."""
+    config = VariantConfig()
+
+    config.set_values("python", ["3.9", "3.10"])
+    config.set_values("numpy", ["1.21", "1.22"])
+
+    combinations = config.combinations()
+
+    # Should have 2 * 2 = 4 combinations
+    assert len(combinations) == 4
+
+    # Each combination should be a dict
+    for combo in combinations:
+        assert isinstance(combo, dict)
+        assert "python" in combo
+        assert "numpy" in combo
+
+
+def test_variant_config_from_yaml() -> None:
+    """Test loading VariantConfig from YAML string."""
+    yaml_content = """
+python:
+  - "3.9"
+  - "3.10"
+  - "3.11"
+numpy:
+  - "1.21"
+  - "1.22"
+"""
+
+    config = VariantConfig.from_yaml(yaml_content)
+
+    keys = config.keys()
+    assert "python" in keys
+    assert "numpy" in keys
+
+    python_values = config.get_values("python")
+    assert python_values is not None
+    assert len(python_values) == 3
+
+
+def test_variant_config_from_file() -> None:
+    """Test loading VariantConfig from a file."""
+    yaml_content = """
+python:
+  - "3.10"
+  - "3.11"
+rust:
+  - "1.70"
+"""
+
+    # Create a temporary file
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
+        f.write(yaml_content)
+        temp_path = Path(f.name)
+
+    try:
+        config = VariantConfig.from_file(temp_path)
+
+        keys = config.keys()
+        assert "python" in keys
+        assert "rust" in keys
+    finally:
+        # Clean up
+        temp_path.unlink()
+
+
+def test_variant_config_with_different_types() -> None:
+    """Test setting variant values with different types."""
+    config = VariantConfig()
+
+    # Strings
+    config.set_values("version", ["1.0", "2.0"])
+
+    # The values should be stored
+    values = config.get_values("version")
+    assert values is not None
+    assert len(values) == 2
+
+
+def test_variant_config_len() -> None:
+    """Test the __len__ method."""
+    config = VariantConfig()
+    assert len(config) == 0
+
+    config.set_values("python", ["3.9"])
+    assert len(config) == 1
+
+    config.set_values("numpy", ["1.21"])
+    assert len(config) == 2
+
+
+def test_variant_config_repr() -> None:
+    """Test the string representation."""
+    config = VariantConfig()
+    config.set_values("python", ["3.10"])
+
+    repr_str = repr(config)
+    assert "VariantConfig" in repr_str
+    assert "keys=1" in repr_str
+
+
+def test_variant_config_empty_combinations() -> None:
+    """Test combinations on empty config."""
+    config = VariantConfig()
+
+    combinations = config.combinations()
+
+    # Empty config should give one empty combination
+    assert len(combinations) >= 0
+
+
+def test_variant_config_zip_keys() -> None:
+    """Test zip_keys functionality."""
+    config = VariantConfig()
+
+    # Initially, zip_keys should be None
+    assert config.zip_keys is None
+
+    # Set variant values
+    config.set_values("python", ["3.9", "3.10", "3.11"])
+    config.set_values("numpy", ["1.20", "1.21", "1.22"])
+
+    # Without zip_keys, we get all combinations (3 * 3 = 9)
+    combinations = config.combinations()
+    assert len(combinations) == 9
+
+    # Set zip_keys to synchronize python and numpy
+    config.zip_keys = [["python", "numpy"]]
+    assert config.zip_keys == [["python", "numpy"]]
+
+    # With zip_keys, we get only synchronized combinations (3)
+    combinations = config.combinations()
+    assert len(combinations) == 3
+
+    # Verify the combinations are synchronized
+    for i, combo in enumerate(combinations):
+        assert combo["python"] == ["3.9", "3.10", "3.11"][i]
+        assert combo["numpy"] == ["1.20", "1.21", "1.22"][i]
+
+
+def test_variant_config_from_yaml_with_zip_keys() -> None:
+    """Test loading VariantConfig from YAML with zip_keys."""
+    yaml_content = """
+python:
+  - "3.9"
+  - "3.10"
+numpy:
+  - "1.20"
+  - "1.21"
+zip_keys:
+  - [python, numpy]
+"""
+
+    config = VariantConfig.from_yaml(yaml_content)
+
+    # Check that zip_keys were parsed correctly
+    assert config.zip_keys is not None
+    assert len(config.zip_keys) == 1
+    assert config.zip_keys[0] == ["python", "numpy"]
+
+    # Check that combinations are synchronized
+    combinations = config.combinations()
+    assert len(combinations) == 2  # Not 4
+
+
+def test_variant_config_from_file_with_context() -> None:
+    """Test loading VariantConfig with JinjaConfig context."""
+    from rattler_build import JinjaConfig
+
+    yaml_content = """
+c_compiler:
+  - if: unix
+    then: gcc
+  - if: win
+    then: msvc
+"""
+
+    # Create a temporary file
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
+        f.write(yaml_content)
+        temp_path = Path(f.name)
+
+    try:
+        # Load with Linux context
+        jinja_config_linux = JinjaConfig(target_platform="linux-64")
+        config_linux = VariantConfig.from_file_with_context(temp_path, jinja_config_linux)
+
+        values_linux = config_linux.get_values("c_compiler")
+        assert values_linux is not None
+        assert "gcc" in values_linux
+        assert "msvc" not in values_linux
+
+        # Load with Windows context
+        jinja_config_win = JinjaConfig(target_platform="win-64")
+        config_win = VariantConfig.from_file_with_context(temp_path, jinja_config_win)
+
+        values_win = config_win.get_values("c_compiler")
+        assert values_win is not None
+        assert "msvc" in values_win
+        assert "gcc" not in values_win
+    finally:
+        # Clean up
+        temp_path.unlink()
+
+
+def test_variant_config_from_yaml_with_context() -> None:
+    """Test loading VariantConfig from YAML string with JinjaConfig context."""
+    from rattler_build import JinjaConfig
+
+    yaml_content = """
+c_compiler:
+  - if: unix
+    then: gcc
+  - if: win
+    then: msvc
+cxx_compiler:
+  - if: unix
+    then: gxx
+  - if: win
+    then: msvc
+"""
+
+    # Load with Linux context
+    jinja_config_linux = JinjaConfig(target_platform="linux-64")
+    config_linux = VariantConfig.from_yaml_with_context(yaml_content, jinja_config_linux)
+
+    c_values = config_linux.get_values("c_compiler")
+    assert c_values is not None
+    assert "gcc" in c_values
+
+    cxx_values = config_linux.get_values("cxx_compiler")
+    assert cxx_values is not None
+    assert "gxx" in cxx_values
+
+
+def test_variant_config_from_conda_build_config() -> None:
+    """Test loading conda_build_config.yaml format with selectors."""
+    from rattler_build import JinjaConfig
+
+    yaml_content = """
+python:
+  - 3.9
+  - 3.10  # [unix]
+  - 3.11  # [osx]
+c_compiler:
+  - gcc       # [linux]
+  - clang     # [osx]
+  - vs2019    # [win]
+"""
+
+    # Create a temporary file
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
+        f.write(yaml_content)
+        temp_path = Path(f.name)
+
+    try:
+        # Load with Linux context
+        jinja_config_linux = JinjaConfig(target_platform="linux-64")
+        config_linux = VariantConfig.from_conda_build_config(temp_path, jinja_config_linux)
+
+        python_values = config_linux.get_values("python")
+        assert python_values is not None
+        assert len(python_values) == 2  # 3.9 and 3.10 (unix selector)
+
+        c_compiler_values = config_linux.get_values("c_compiler")
+        assert c_compiler_values is not None
+        assert "gcc" in c_compiler_values
+        assert "clang" not in c_compiler_values
+        assert "vs2019" not in c_compiler_values
+
+        # Load with macOS context
+        jinja_config_osx = JinjaConfig(target_platform="osx-64")
+        config_osx = VariantConfig.from_conda_build_config(temp_path, jinja_config_osx)
+
+        python_values_osx = config_osx.get_values("python")
+        assert python_values_osx is not None
+        assert len(python_values_osx) == 3  # 3.9, 3.10 (unix), and 3.11 (osx)
+
+        c_compiler_values_osx = config_osx.get_values("c_compiler")
+        assert c_compiler_values_osx is not None
+        assert "clang" in c_compiler_values_osx
+        assert "gcc" not in c_compiler_values_osx
+
+        # Load with Windows context
+        jinja_config_win = JinjaConfig(target_platform="win-64")
+        config_win = VariantConfig.from_conda_build_config(temp_path, jinja_config_win)
+
+        python_values_win = config_win.get_values("python")
+        assert python_values_win is not None
+        assert len(python_values_win) == 1  # Only 3.9 (no unix/osx selectors match)
+
+        c_compiler_values_win = config_win.get_values("c_compiler")
+        assert c_compiler_values_win is not None
+        assert "vs2019" in c_compiler_values_win
+    finally:
+        # Clean up
+        temp_path.unlink()
+
+
+def test_variant_config_multiple_zip_key_groups() -> None:
+    """Test multiple zip_key groups."""
+    config = VariantConfig()
+
+    # Set variant values
+    config.set_values("python", ["3.9", "3.10"])
+    config.set_values("numpy", ["1.20", "1.21"])
+    config.set_values("c_compiler", ["gcc", "clang"])
+    config.set_values("cxx_compiler", ["gxx", "clangxx"])
+
+    # Set multiple zip_key groups
+    config.zip_keys = [["python", "numpy"], ["c_compiler", "cxx_compiler"]]
+
+    # Should get 2 * 2 = 4 combinations (not 2 * 2 * 2 * 2 = 16)
+    combinations = config.combinations()
+    assert len(combinations) == 4
+
+    # Check that synchronization is preserved
+    for combo in combinations:
+        # python-numpy should be synchronized
+        if combo["python"] == "3.9":
+            assert combo["numpy"] == "1.20"
+        else:
+            assert combo["numpy"] == "1.21"
+
+        # c_compiler-cxx_compiler should be synchronized
+        if combo["c_compiler"] == "gcc":
+            assert combo["cxx_compiler"] == "gxx"
+        else:
+            assert combo["cxx_compiler"] == "clangxx"