SELLIT9 is seeking a senior product designer to own the end-to-end design of the consumer trade-in experience, merchant flows, and a unified design system. You will work closely with the CTO, engineering, and product to decide what to build and how to ship daily, leveraging AI-enabled tooling and data from real user sessions. You will translate product problems into specs and MVPs, ship production-ready React components, and ensure on-brand output across web and mobile, while continuously