Worked on the istio/istio repository to deliver overlapping port support for ListenerSets and Gateways, addressing the need for greater configuration flexibility in complex Kubernetes deployments. Enhanced listener validation logic in Go to allow overlapping ports while ensuring invalid configurations are skipped, thereby improving reliability and reducing misconfiguration risks. Introduced a safety mechanism to prevent the creation of Istio servers for HTTPS or TLS listeners lacking a defined TLS section. Developed comprehensive tests to verify correct handling of overlapping ports and invalid listener scenarios. This work leveraged skills in API design, backend development, and Istio, focusing on robust and secure gateway configuration.