Worked on stabilizing the cache subsystem in the Shopify/rails repository, focusing on backend development and robust error handling using Ruby. Addressed a critical reliability issue by enhancing the MemCacheStore’s read_multi_entries method to gracefully handle connection-related errors, ensuring that cache read failures no longer cascade into user-facing problems. This approach improved the resilience of cache operations under unreliable network conditions, directly supporting production reliability and performance goals. Emphasized thorough testing to validate the new error handling logic, resulting in a more stable and predictable caching layer without introducing new features, and aligning with ongoing efforts to strengthen system reliability.