Worked on backend reliability for the alan-eu/activepieces repository by addressing a critical issue with Redis Sentinel authentication. Focused on stabilizing cache connectivity, the developer implemented support for optional usernames in the Redis client options, enabling proper authentication with Redis Sentinel when required. This change reduced deployment risks and potential downtime in Sentinel-based environments, ensuring more robust database management. The solution was delivered using TypeScript and Node.js, demonstrating a strong grasp of backend development and database connectivity. The work prioritized infrastructure stability over new feature delivery, reflecting a thoughtful approach to maintaining system reliability in production deployments.