Worked on the HabitRPG/habitica repository to deliver a cross-platform deduplication mechanism for streak achievement notifications, addressing issues where users received multiple alerts for the same streak. The solution involved implementing deduplication logic on both the server and client sides using JavaScript and Vue.js, ensuring that only a single notification was sent per achievement. This approach reduced notification noise and API load while maintaining the integrity of streak-based rewards. The work also included unit testing to validate the changes and code cleanups to improve maintainability. The updates contributed to a more stable and consistent user experience for streak tracking.