During their work on the envoyproxy/gateway repository, Bailey focused on stabilizing TLS passthrough routing by addressing a filter chain uniqueness bug that affected SNI-based routing for empty routes. They implemented SNI-based filter chain matching in Go, ensuring each listener maintained a unique filter chain and preventing configuration rejections in Envoy. Their approach included enhancing the configuration schema with a Hostnames field and introducing TLSInspectorConfig to support per-listener TLS routing. Bailey expanded test coverage to validate these changes in complex listener scenarios, demonstrating depth in API development and network programming while improving reliability and maintainability of TLS passthrough behavior.