Senior Software Engineer, Mobile

Upstart is an AI lending marketplace focused on reducing the cost and complexity of borrowing. The Senior Software Engineer, Mobile will design, build, and maintain React Native applications for iOS and Android, collaborating with product, design, and backend teams to deliver scalable mobile features and improve the borrower experience.

Responsibilities:

• Build and maintain user-facing features in our React Native mobile apps across iOS and Android
• 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
• 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

Requirements:

• Bachelor's degree in Computer Science, Engineering, or Mathematics, or a related field (or its equivalent) and 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
• This role is available in the following locations: Remote
• The team operates on the East/West coast time zones
• The majority of our employees can live and work anywhere in the U.S but are encouraged to to still spend high quality time in-person collaborating via regular onsites. The in-person sessions' cadence varies depending on the team and role; most teams meet once or twice per quarter for 2-4 consecutive days at a time
• Have helped launch or scale a React Native app on the Android platform
• Have experience with mobile analytics, push notifications, deep linking, or A/B testing frameworks
• Have worked in a fast-paced product company where mobile was a primary user touchpoint