During a two-month period, PotatosaladX enhanced the erlang/otp and facebook/buck2 repositories by delivering targeted improvements in backend and system programming. In erlang/otp, they improved restricted-shell support and scheduler efficiency by refining the not_restricted function for flexible file descriptor handling and optimizing pollset migration for multi-process workloads, leveraging deep knowledge of Erlang VM internals and C. For facebook/buck2, PotatosaladX strengthened dynamic Erlang toolchain robustness by implementing extraction-time error handling for missing OTP applications and ensuring erts inclusion in generation scripts, using Python and Erlang. Their work addressed reliability, compatibility, and performance, demonstrating thoughtful engineering and cross-repository collaboration.