Worked on targeted code quality improvements in the lichess-org/scalachess and lichess-org/lila-ws repositories, focusing on maintainability and technical debt reduction. In scalachess, refactored the Horde variant’s insufficient material check by removing a duplicate bishop-and-pawn condition, simplifying the chess logic without altering user-facing functionality. In lila-ws, eliminated an unused ThroughStudyDoor case class from model.scala, reducing dead code and clarifying code paths. All changes were internal, aimed at cleaner code and easier future development. Utilized Scala and applied skills in clean code, code refactoring, and game development to enable safer feature delivery and smoother onboarding for future contributors.