Sumit Kumar developed the ProtoApiScrubber HTTP Payload Filter API for the envoyproxy/envoy repository, introducing a new filter surface that enables field-level payload restrictions for HTTP requests and responses. Leveraging Protocol Buffers and gRPC, he integrated the filter with Envoy’s unified matcher API to support scalable, field-based matching. His work established the initial scaffolding for future policy-driven payload scrubbing, addressing privacy and compliance requirements. Although the feature is a work in progress, Sumit’s contributions focused on robust API design and seamless integration with core networking filter components, laying a strong foundation for extensible and maintainable payload filtering within Envoy.