Andy focused on backend reliability and stability, addressing critical issues in both the envoyproxy/gateway and chalk-ai/chalk-go repositories. He resolved a panic in the request mirror filter for gRPC routes by refining route type identification and backend reference validation, ensuring correct operation for both HTTP and gRPC traffic. In chalk-go, Andy fixed server discovery failures by switching the endpoint resolution mechanism to GRPCQueryServer, improving client connectivity. His work demonstrated strong skills in Go, gRPC, and configuration management, with careful debugging and cross-repository alignment. These targeted fixes enhanced runtime stability and reduced incident risk, reflecting depth in production-grade backend engineering.