Yifan Yuan focused on stabilizing build processes for the fbthrift and CacheLib repositories by addressing libunwind integration issues. Using C++ and Python, Yifan updated libunwind versions to resolve aarch64 compilation failures and corrected manifest path errors to ensure accurate dependency resolution. This work involved careful build configuration and manifest management, targeting build system reliability and portability. By eliminating regressions and improving CI stability, Yifan enabled smoother downstream integrations and faster development cycles. The depth of the work lay in diagnosing subtle build and dependency issues, resulting in more robust library management and improved build correctness across both repositories.