Senior Software Engineer, Identity Platform

About Upstart At Upstart, we’re united by a mission that matters: to radically reduce the cost and complexity of borrowing for all Americans. Every day, we bring creativity, experimentation, and advanced AI to reshape access to credit, helping millions move forward financially with clarity and confidence. As the leading AI lending marketplace, we partner with banks and credit unions to expand access to affordable credit through technology that’s both radically intelligent and deeply human. Our platform runs over one million predictions per borrower using more than 1,800 signals, powering smarter, fairer decisions for millions of customers. But the numbers only hint at the impact. Every idea, every voice, and every contribution moves us closer to a world where credit never stands between people and their financial progress. We’re proudly digital-first, giving most Upstarters the flexibility to do their best work from wherever they thrive, alongside teammates across 80+ cities in the US and Canada. Digital-first doesn’t mean distant. We’re intentional about in-person connection through team onsites, planning sessions, and moments that spark creativity and trust. And whether you choose to work primarily from home or collaborate in-person from one of our offices in Columbus, Austin, the Bay Area, or New York City (opening Summer 2026), you’ll have the support to work in the way that works best for you. If you’re energized by tackling meaningful problems, excited to innovate with purpose, and motivated by work that truly matters, we’d love to hear from you. The Team: At Upstart, the Identity and Experimentation Platform Team plays a pivotal role in shaping the security and accessibility of our cutting-edge lending products, including Personal Loans, Auto Loans, and Home Loans. We are responsible for creating, securing, and managing borrower and partner identities, ensuring a seamless and secure experience at every touchpoint. As part of our team, you’ll work on the Authentication, Authorization and Experimentation Platform, driving both backend security and frontend user experiences. Our mission is to enable frictionless, secure authentication while safeguarding sensitive data from unauthorized access.If you’re passionate about building scalable security solutions and delivering intuitive user experiences, come be a part of a team that makes financial access more accessible, safer, smarter, and seamless for everyone!