Worked on kubernetes/kubernetes and kubernetes/apimachinery, focusing on backend development and performance optimization using Go and YAML. Delivered two features that improved label selector efficiency and reduced unnecessary processing by implementing optimized label lookup and early exit logic. Addressed three bugs, including fixes for relisting failures caused by client-side timeouts and partial-read conditions, and corrected pod anti-affinity configuration to ensure proper scheduling. Enhanced error handling and network programming robustness by aligning timeout semantics and expanding test coverage for relisting under latency. The work emphasized reliability, scalability, and maintainability, with thorough testing and careful attention to error signaling and configuration management.