Worked on the facebook/buck2-prelude repository to enhance build reliability and stability by addressing critical bugs in the build system. Focused on Python and Starlark, reinstating duplicate module name validation to prevent conflicts between Swift and Clang modules, which reduced build failures and improved developer productivity. Additionally, refined the Remote Execution pipeline by conditionally applying the -disable-sandbox flag based on environment variables, resolving issues with nested sandbox actions and maintaining sandbox isolation for local builds. These targeted fixes improved CI pipeline stability and reduced triage time, demonstrating a methodical approach to DevOps and build system maintenance without introducing new features.