During March 2025, Chungjung D. focused on repository hygiene for the gsainfoteam/groups-be project by implementing a feature to exclude Nix and environment-related files from version control. Leveraging skills in configuration management and Git, Chungjung updated the .gitignore to prevent accidental commits of files such as .direnv, .envrc, flake.nix, and flake.lock. This approach reduced continuous integration noise and minimized environment drift, resulting in a more consistent development experience. By applying expertise in Nix and environment management, Chungjung improved onboarding and collaboration for contributors, delivering a cleaner, safer codebase while addressing common pain points in multi-developer workflows.