Mads developed and delivered the Subnano Partner Onboarding feature for the coinbase/x402 repository, enabling seamless onboarding of new ecosystem partners with a comprehensive metadata surface. The work involved designing and implementing an end-to-end onboarding workflow that captures partner details such as name, category, logo URL, description, and website, all structured in JSON. Leveraging skills in data integration and front end development, Mads established a scalable partner registry entry that sets a foundation for future integrations. The feature was delivered with clear traceability to a specific commit, demonstrating a focused and well-scoped engineering effort over the course of one month.