Worked on the PowerDNS/pdns repository to implement EDNS Extended Error (EDE) signaling for Negative Trust Anchors (NTA), enhancing DNSSEC observability and diagnostics. Developed a configurable mechanism using C++ and Python that attaches EDE code 33 to DNS responses covered by NTAs, with the feature gated to only apply on validating queries. Ensured backward compatibility by setting the default configuration to off and provided comprehensive unit and integration tests to validate behavior. This work improved the reliability of DNS responses for operators and clients, reduced unnecessary signal noise, and strengthened configuration management and documentation within the backend codebase.