Shubham worked on the NethermindEth/nethermind repository, focusing on stabilizing Engine API authentication by addressing a critical bug in JWT secret path resolution. Using C# and leveraging skills in API and backend development as well as configuration management, Shubham replaced a hardcoded JWT secret path with a null baseline and introduced logic to dynamically determine the correct path based on the keystore directory. This approach improved reliability across diverse environments and deployments, reducing authentication failures and support overhead. The work demonstrated a thoughtful, targeted fix that enhanced security posture and operational stability, reflecting a deep understanding of backend authentication mechanisms.