Worked on backend development for the Homebrew/brew repository, delivering a targeted performance optimization for the GitDownloadStrategy component. Addressed slowdowns in the repo_valid? method when operating within large working directories by leveraging the git -C flag, which allowed git commands to specify the work tree directly and avoid scanning the entire current directory. This Ruby-based solution reduced latency during repository validation and improved the responsiveness of brew operations in large-repo scenarios. The work demonstrated proficiency in Ruby on Rails, performance profiling, and git command-line tooling, and was completed through effective cross-team collaboration and careful handling of work-tree operations.