Worked on the k3s-io/k3s repository to deliver security and networking enhancements using Go and Kubernetes expertise. Developed a feature to enforce 0600 permissions on compressed etcd snapshots, adding comprehensive tests to ensure correct file security and reduce risk. Improved networking configuration management by skipping bridge netfilter sysctls when both kube-proxy and flannel are disabled, streamlining system configuration. Refactored the codebase to use a KubeProxyDisabled helper instead of a direct configuration field, simplifying maintenance. All changes were accompanied by targeted unit tests, demonstrating a methodical approach to backend development and a focus on maintainability and secure system operations.