Matthew Huynh focused on improving build reliability for the facebook/buck2-prelude repository by addressing recurring failures in Remote Execution (RE) environments. He identified that the unavailability of the checkpolicy tool was causing build errors and responded by modifying Starlark-based build rules to introduce a new label, ensuring that rules requiring checkpolicy are always evaluated locally. This targeted fix reduced RE-related build failures and improved CI feedback speed. Matthew’s work demonstrated a strong grasp of build systems and CI/CD processes, with careful attention to repository hygiene and auditable changes, resulting in a more stable and productive development workflow for the team.