ABOUT SPHERE

Every breakthrough in trade infrastructure has followed the same pattern: reduce a transaction cost, expand the market. Containerization for goods. SWIFT for money. Stripe for payments. Compliance is one of the last and largest — and the hardest, because trade rules aren't data to be looked up. They're a complex adaptive system with 190+ sovereign jurisdictions, in different languages, changing constantly, reacting to each other. Sphere built the system that solves it. Our AI (TRAM) ingests global trade law, interprets it, resolves conflicts across jurisdictions, and produces compliance determinations more reliable than human experts. We handle the entire lifecycle — calculation, registration, filing, remittance — at millisecond latency with zero downtime.

• Backed by a16z and YC. $21M Series A, 30%+ month-over-month growth, customers include ElevenLabs, Replit, Deel, Runway, and Lovable.
• Small team, global surface area. Everyone owns a domain that would be a full team at a larger company. San Francisco, five days in office.
• The problem keeps compounding. Expanding into input tax, withholding, e-invoicing, tariffs — each multiplies the complexity. Tens of millions of transactions today, billions ahead.

THE ROLE

We are seeking a Sales Tax Lead to serve as a key member of our Tax team and the primary subject matter expert on U.S. sales and use tax matters. Reporting directly to the Head of Tax, this role will help shape how tax is reflected across our products, operations, and customer experience by translating complex tax requirements into scalable business solutions. You will partner closely with Product, Engineering, Operations, Compliance, and Customer Success teams to evaluate the tax implications of new products, features, and business initiatives. You will lead tax research, support product taxability decisions, provide guidance on customer and internal tax questions, and monitor regulatory developments that impact our platform and customers. As a foundational member of the tax organization, you will help build and scale the processes,...