Worked on enhancing build reliability and documentation quality across the swiftlang/swift-driver and swiftlang/swift-testing repositories. Focused on Windows development, the work involved reverting a previous simplification in linker invocation and reintroducing explicit linker selection logic, improving build correctness and profiling integration for mixed C++ and Swift projects. Addressed profiling flag propagation to ensure accurate performance insights and maintainability in the Windows toolchain. Additionally, improved documentation in swiftlang/swift-testing by updating Markdown references and fixing broken links, reducing onboarding friction for users. Utilized Swift and Markdown, applying skills in build systems, compiler development, and technical documentation to address targeted bugs.