Worked on enhancing test reliability for the grpc-go repository by addressing a race condition in the pickfirstleaf balancer tests. Applied Go concurrency techniques, introducing a mutex to the ccStateSubscriber to ensure thread-safe access to recorded states during concurrent test operations. This targeted fix eliminated data races that previously led to flaky test outcomes, thereby improving the stability and reliability of the test suite. Focused on test-hardening practices and leveraged skills in Go and testing to strengthen continuous integration processes. The work contributed to greater release confidence and improved product quality for downstream users relying on grpc-go’s core functionality.