Cristiano delivered a feature for the envoyproxy/envoy repository that enables service-provider filtering using the autonomous system organization name from the MaxMind GeoIP provider. He designed and implemented an extension to the API in C++ and YAML, allowing Envoy to populate a request header with the asn_org field, which contains a human-readable organization name such as “Amazon-02.” This approach increases security and configurability by letting users filter traffic without a paid ISP database. Cristiano ensured comprehensive unit testing, maintained backwards compatibility, and updated documentation and release notes, demonstrating a thorough and collaborative engineering process focused on maintainability and user impact.