Worked on enhancing the reliability of Kubernetes leader election tests in the kubernetes/kubernetes repository by migrating resource locking from ConfigMap to Lease-based mechanisms. This involved updating test files to use the Lease API, removing non-lease resource locks, and aligning the test suite with current Kubernetes leader election semantics. The changes reduced test flakiness and improved the stability of continuous integration pipelines, directly impacting the reliability of critical election logic. Demonstrated proficiency in Go programming, Kubernetes internals, and automated testing practices while focusing on maintaining consistency and robustness in the test framework. Addressed one bug fix during this period.