Worked on enhancing resilience and reliability in distributed systems, focusing on TiDB’s interaction with Placement Driver within the Shopify/tidb repository. Developed and integrated a circuit breaker mechanism for PD 'get region' calls, introducing a configurable system variable to manage error-rate thresholds and reduce cascading failures. In the pingcap/tidb-engine-ext repository, improved test reliability by enforcing Python3 for script execution and added a docker_test feature flag to expand Docker-specific test coverage. Leveraged Go, Python, and TOML to address configuration management, error handling, and testing challenges, resulting in more robust system design and reproducible continuous integration environments across Linux platforms.