Jan Grodowski focused on improving file watching reliability and configurability in the Shopify/rails repository, addressing a persistent issue with flaky file update checks in tests that use time travel. By updating the FileUpdateChecker to rely on process time and ensuring the route reloader respected the configured file watcher, Jan enhanced both test stability and production predictability. Working primarily with Ruby and leveraging backend development skills in Ruby on Rails, Jan delivered targeted bug fixes that contributed to more stable continuous integration runs. The work demonstrated a thoughtful approach to backend reliability, though it was limited in scope to a single bug fix.