Worked on the kubernetes/kubernetes repository to enhance the reliability of policy evaluation by addressing a bug in the Policy Matcher component. Focused on backend development using Go, the work involved fixing the handling of nil selectors to prevent nil pointer dereferences, which previously posed a risk in production environments. The solution introduced explicit error handling for uninitialized selectors, resulting in clearer error messages and faster diagnosis of configuration issues. By targeting a specific area of the policy matching logic, the change improved overall robustness while minimizing the impact on unrelated code, demonstrating careful attention to error handling and maintainability in Go systems.