Developed and delivered a user notification system for the CMSC128 repository, focusing on backend functionality using Node.js, Express.js, and RESTful API design. The work included creating an API endpoint and backend controller to support per-user unread notifications and a mark-as-read feature, all integrated with authentication context to ensure notifications are served to the correct user. This system enables timely, persisted notifications, reducing the need for manual checks and decoupling notification data from the user interface. The implementation also established a foundation for future frontend integration and analytics, with attention to code hygiene and minor stability improvements throughout the process.