Mayank Kumar focused on backend stability improvements for the keploy/keploy repository, addressing a critical resource leak in the proxy cleanup workflow. He enhanced the StopProxyServer function to guarantee that mutexes, DNS servers, listeners, and error channels are always properly released, reducing the risk of deadlocks and leaks. By refining error handling and logging, he made diagnostics more straightforward and reliable. His work also included correcting a versioning identifier typo across multiple files for consistency. Leveraging Go and applying skills in concurrent and network programming, Mayank delivered targeted, in-depth fixes that improved the reliability and maintainability of the codebase.