Senior Mobile Software Engineer, Upstart

• 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
• 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
• Communicate effectively with cross-functional partners in product, design, and backend engineering
• Take ownership of your work and are comfortable delivering complex features from planning through release
• Balance speed and quality, and advocate for maintainable, scalable engineering solutions
• Contribute to team culture and engineering practices through feedback, mentoring, and collaboration
• Embrace a growth mindset and enjoy learning from others while helping teammates grow

Desirable

• 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
• You’ll contribute to engineering quality through thoughtful system design, code review, and a focus on long-term maintainability
• 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
• 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