Worked on the lichess-org/mobile repository to implement persistent puzzle streaks, enhancing user continuity and engagement within the mobile application. Focused on improving the puzzle-loading flow by refactoring from loadPuzzle to onLoadPuzzle, which simplified the process and reduced the risk of regressions. Applied null-safety checks in Dart to prevent crashes when streak data was missing, thereby increasing overall app stability. Utilized Flutter and state management techniques to ensure streaks were automatically saved after each puzzle load. Additionally, performed minor formatting cleanups around the streak-saving logic to improve code readability and maintainability, contributing to a more robust and user-friendly experience.