Senior Mobile Software Engineer

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 Role As a Senior Mobile Software Engineer at Upstart, you’ll help design and build scalable, high-quality mobile applications using React Native. You’ll collaborate closely with product managers, designers, and backend engineers to deliver features that delight users and align with company goals. This is a hands-on, execution-focused role for an experienced engineer who wants to ship features, own technical decisions, and improve our mobile platform. You’ll contribute to engineering quality through thoughtful system design, code review, and a focus on long-term maintainability. The Team The Mobile team at Upstart is building the future of our user experience. Our mobile codebase is React Native-first, and we’re in the early stages of expanding from iOS into Android. Our work spans user-facing features, performance optimization, platform tooling, and tight collaboration with backend and design partners. We’re a fast-moving team that values pragmatism, quality, and impact — and we’re laying the foundation for a scalable and user-first mobile platform. What You’ll Do Build and maintain user-facing features in our React Native mobile apps across iOS (and Android, as we expand). Design and implement mobile components and subsystems that are performant, maintainable, and scalable across platforms. Collaborate with product and design teams to scope, implement, and launch features that align with user and business needs. Contribute to platform improvements, including tooling, testing strategies, CI/CD, and performance monitoring. Work with backend engineers to define mobile-specific APIs and improve client-server integration patterns. Identify and resolve performance or reliability issues in the mobile experience. Participate in code reviews, architecture discussions, and technical planning to raise engineering quality across the team. Support a strong mobile engineering culture through mentorship, collaboration, and a focus on continuous improvement. We’re Excited About You Because You… Bachelor’s degree in Computer Science, Engineering, or Mathematics, or a related field (or its equivalent) + 4 years of experience Have experience building in React Native, and familiarity with at least one native platform (e.g., Swift/Objective-C for iOS or Kotlin/Java for Android). Understand mobile performance, memory management, and platform-specific constraints. Communic ... (truncated, view full listing at source)