Worked on maintaining and stabilizing core infrastructure in the facebook/fbthrift and facebook/buck2-prelude repositories, focusing on build system configuration and test reliability. Addressed issues in protocol test stability by reverting changes to serialization dependencies in C++ and Protocol Buffers, ensuring that test suites remained compatible and reproducible. In buck2-prelude, restored BUCK build stability by reverting a problematic dependency upgrade, preventing downstream integration issues and maintaining consistent build environments. Emphasized disciplined version control and rollback procedures, prioritizing reliability over new feature development. Demonstrated a methodical approach to troubleshooting and maintenance, with a focus on C++, BUCK, and automated testing workflows.