Principal Software Engineer - Commerce

POS-9034 About the Team Commerce Hub is building the backbone for businesses to sell, bill, get paid, and manage revenue inside HubSpot. Our systems handle billions of dollars in transactions for our customers, so correctness, clarity, and predictability matter. We’re creating an AI-first commerce platform that’s deeply integrated with HubSpot’s CRM - simple, consistent, and extensible across every part of the seller and buyer experience. About the Role We’re looking for a Principal Software Engineer to help shape the technical future of Commerce Hub. This is a very hands-on role. You’ll write code, dive into services, review tough designs, debug messy systems, and directly own the architecture behind some of the most critical surfaces in CPQ, Billing, Payments, and Revenue OS. What You’ll Do Build a simple, consistent, extensible platform Shape the technical roadmap across CPQ, Billing, and Payments with strong, opinionated patterns. Define and evolve core domain models so pricing, products, contracts, invoices, and payments behave predictably everywhere. Create frameworks that make the platform easy to extend without adding complexity. Be a deeply hands-on, high-leverage builder Write code regularly. Lead design reviews and build high-impact systems end-to-end. Own large multi-team initiatives that span CPQ, Billing and Payments. Take prototypes to production at scale. Lead...