Worked on the facebook/buck2-prelude repository to deliver Apple SDK Version Compatibility Mapping, enabling users to build against the latest Apple SDKs with reduced upgrade friction. The main contribution involved updating the apple_target_sdk_version.bzl file using Starlark to map iOS 18.2 to macOS 15.2, ensuring compatibility with new device targets. The approach included validating these changes against Xcode 18.2 beta, focusing on configuration accuracy and future-proofing the build system. This work demonstrated skills in build system configuration and domain-specific language (DSL) scripting, laying the foundation for ongoing compatibility maintenance and supporting seamless adoption of new Apple SDK versions.