Worked on stability improvements for the Buck2 Prelude and OCamlREPO (ocamlrep) repositories, focusing on resolving build and runtime issues through targeted reversions. Addressed problems introduced by previous changes by restoring the cdylib link strategy in Buck2 Prelude and reverting memory allocator flags and Rust toolchain versions in OCamlREPO. Employed skills in Rust, build system configuration, and memory management to align toolchains and configurations with stable baselines, thereby reducing regression risk for downstream projects. Demonstrated careful change management by prioritizing reliability and ensuring that both repositories maintained consistent, stable environments for ongoing and future development work.