Josh Woodward developed backward-compatible support for untrusted TLS certificates in the fastly/go-fastly client, focusing on improving local testing workflows. He introduced the allow_untrusted_root option to both CreateCustomTLSCertificateInput and UpdateCustomTLSCertificateInput, enabling developers to upload TLS certificates signed by untrusted certificate authorities for local environments. This feature was implemented in Go and required careful attention to API integration and SDK development to ensure seamless adoption without breaking existing functionality. Josh also updated user-facing documentation to clarify the new option, demonstrating a thorough approach to both code and communication. His work deepened TLS/SSL support and enhanced local test coverage.