Senior Software Engineer - Partner Experience

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: The Capital Marketplace vertical is the fuel that powers Upstart’s AI based lending operations. Spread across multiple dynamic high performance teams; Capital Marketplace is in charge of onboarding and maintaining Capital Marketplace relations with both our Lending Partners and Investors. The Partner Experience team owns the platform , tooling, and implementation work that makes it simple for Lending Partners to integrate with, configure, operate, and report on Upstart products (including white -label flows). We provide both our internal and external business partners with reports, forecasting, financial reporting and help optimize the connection between our customer base and the funding suppliers. As the Senior Software Engineer at Upstart, you will contribute to shape up the platform , collaborate with engineers and cross-functional teams such as Product, Analytics, Lending Partnerships, and Capital Marketplace on a wide range of projects that grow your skills in full stack development, cloud platforms, and financial systems. How you’ll make an impact Collaborate with product managers, engineers, and business stakeholders to deliver projects that align with business goals Assist in the design, development, and maintenance of self-service tools that enhance the investor experience Work with business stakeholders to identify opportunities for process optimization and build solutions that improve business workflows Develop scalable, reliable systems that meet the needs of both internal users and external investors Ensure security, performance, and availability of our critical platforms Participate in code reviews, testing, and the deployment of high-quality code Minimum Qualifications 5+ years of experience in software development, with a strong focus on full-stack development, distributed systems, and APIs Design, build, and maintain scalable APIs, services, and UIs that enable partners to access performance data, operational workflows, and program controls. Experience with some or many of the following: Ruby on Rails, Kotlin, PostgreSQL, React, Next.js, Vercel, Python Experience with cloud platforms (AWS, GCP, Azure) and deploying applications in a cloud native environment Experience with microservices architecture and real-time data processing pipelines (Kafka, Spark, or similar) Familiarity with database technologies such as SQL and data ware ... (truncated, view full listing at source)