Over a three-month period, contributed to the loft-sh/vcluster repository by developing and stabilizing features focused on Kubernetes resource synchronization, network policy validation, and certificate management. Delivered resource class synchronization filtering, ensuring only label-matched Kubernetes classes are propagated between clusters, and improved CI reliability by addressing flaky end-to-end tests using Go and YAML. Expanded test coverage for cross-cluster NetworkPolicy synchronization, refining configuration management to ensure accurate automated validation. Added comprehensive end-to-end tests for certificate rotation, including expiration and high-availability scenarios, refactoring test files to validate both CA and leaf certificate renewal. Work emphasized reliability, operational safety, and robust test automation.