Worked on the Rancher Cilium and derailed/cilium repositories, focusing on backend and networking improvements using Go, C, and BPF. Delivered versioning support for drop notify messages, aligning control-plane and dataplane structures to enable independent evolution and backward compatibility. Optimized endpoint deletion handling by bypassing rate limiting for already-deleted endpoints, reducing duplicate Kubelet operations and unnecessary logging. In derailed/cilium, refactored IPv6 NodePort routing by introducing a helper for address selection, preferring global over link-local addresses, and expanded unit tests to validate reliability. These changes improved system stability, observability, and IPv6 routing for Kubernetes environments through targeted, test-driven development.