Worked on the kubernetes/ingress-gce repository to address a concurrency issue affecting provider configuration handling during production traffic routing and updates. Focused on backend development using Go, the work involved implementing mutex-based synchronization within the GCEFake path for GCEForProviderConfig. This approach resolved a critical race condition that previously caused panics due to concurrent map writes, thereby improving the reliability and stability of the provider config workflow. By eliminating instability in concurrent scenarios, the changes reduced the risk of failures during production deployments. The work demonstrated a strong understanding of concurrent programming principles and contributed to more robust system behavior.