Principal Mobile Software Engineer, Upstart

• Have 8+ years of professional software development experience, including meaningful contributions to production mobile apps
• Have built and maintained features in both React Native and at least one native platform (e.g., Swift/Objective-C for iOS or Kotlin/Java for Android)
• Understand the nuances of mobile performance, memory management, and platform-specific challenges
• Have led architecture planning and helped engineering teams make informed tradeoffs
• Communicate early and often with cross-functional partners in product, design, backend, and QA to ensure alignment and shared understanding
• Take ownership of your work from design through delivery, and value long-term thinking over quick fixes
• Appreciate the strength of diverse perspectives and thrive on being part of an inclusive, collaborative team
• Embrace a growth mindset, value mentorship, and enjoy helping others grow

Desirable

• As a Principal Mobile Software Engineer at Upstart, you’ll sit at the intersection of mobile platform and product development
• You’ll lead efforts to scale and refine our React Native architecture while partnering closely with product, design, and backend teams to ship impactful, high-quality features
• You’ll define technical direction, improve developer experience, and mentor other engineers — all while helping Upstart grow into a truly mobile-first company
• This is a highly cross-functional role with visibility across the stack and deep influence on how we build and deliver mobile software
• You’ll play a key role in shaping how mobile is built and scaled at Upstart — helping define mobile as a core product pillar and driving impact across teams and surfaces
• The Mobile team at Upstart is building the future of our user experience. Today, we have a live iOS app built in React Native, and we’re actively planning our Android expansion
• Our platform is still early-stage, which means there's a huge opportunity to influence architecture, best practices, performance, and product velocity
• We move quickly, collaborate tightly with backend and design, and care deeply about quality — not just in the UI, but in the systems that power a great user experience
• Drive technical strategy for our mobile apps — from platform architecture to product scalability and developer experience
• Build foundational systems in React Native that enable fast, high-quality feature development across both iOS and Android
• Collaborate with product and design to scope, implement, and launch user-facing features that align with company goals
• Bridge mobile and backend systems by shaping APIs and improving client-server interaction patterns
• Identify friction in the mobile development lifecycle and lead improvements to tooling, modularization, CI, and testing strategies
• Mentor engineers and help grow a culture of ownership, technical rigor, and continuous learning
• Influence both product and platform direction as we scale our mobile efforts across multiple surfaces and teams
• Support company goals such as improving user engagement, increasing retention, and unlocking new growth channels through mobile innovation
• Help define and uphold the engineering culture, patterns, and practices that guide mobile development at Upstart
• This team operates across all U.S. time zones