In February 2025, CJ Hopman developed a cache-enabled git_fetch feature for the facebook/buck2-prelude repository, focusing on build system development and caching strategies. By introducing the allow_cache_upload attribute, CJ enabled git_fetch to write fetch results directly to the cache, reducing repeated I/O and improving fetch latency. The implementation, written in Starlark, integrated cache logic into the Buck2 rule extension, allowing for faster reads and minimizing unnecessary data materialization. This work laid the foundation for broader cache-based performance improvements across Buck2 fetches, demonstrating a thoughtful approach to optimizing build workflows through targeted caching and clear, maintainable code changes.