Worked on the medusajs/medusa repository, focusing on backend reliability and developer experience over a two-month period. Addressed a documentation issue by updating the Ticket Booking Guide to accurately reflect middleware usage, ensuring that code snippets aligned with actual backend logic and validating changes through documentation workflows. Improved Redis caching by scoping tag invalidation to affected entries, eliminating global KEYS scans and reducing the risk of Redis blocking in large keyspaces. Delivered targeted regression tests and maintained package documentation, using JavaScript, TypeScript, and Redis. The work emphasized low-risk, maintainable changes that enhanced performance, correctness, and clarity for future development.