Worked on the kubernetes/kubernetes repository to enhance secret management by introducing declarative validation and immutability for the Secret type. Focused on improving API stability, the work involved updating validation logic to prevent redundant execution and migrating tests to ensure comprehensive coverage of immutability scenarios. Leveraged Go for both feature development and extensive testing, aligning new validation rules with evolving Kubernetes API standards. The changes included regenerating validation code and relocating tests to improve maintainability and consistency across the codebase. This effort strengthened security and reliability for cluster secret management while supporting ongoing tooling and validation-gen updates within the project.