Worked across core Swift repositories to enhance cross-platform support and build system reliability, focusing on FreeBSD enablement and normalization of platform handling. In swiftlang/swift-package-manager and apple/swift-system, introduced FreeBSD support by refining platform recognition, improving concurrency-safe file I/O, and standardizing target triples for broader compatibility. Addressed bugs in swiftlang/swift-corelibs-libdispatch by correcting architecture detection and dispatch source handle retrieval, while also improving code formatting for maintainability. Leveraged C, Swift, and CMake to implement robust conditional compilation and cross-compilation strategies, consolidating build logic and increasing portability. Prioritized maintainability and test coverage, reducing platform-specific edge cases and simplifying future enhancements.