Software Engineer, Mobile

Upstart is a leading AI lending marketplace focused on reducing the cost and complexity of borrowing for all Americans. They are seeking a Senior Mobile Engineer to design and build high-quality mobile applications using React Native, collaborating with cross-functional teams to enhance the borrower-facing servicing experience.

Responsibilities:

• 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

Requirements:

• 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
• Have helped launch or scale a React Native app on the Android platform
• Are comfortable working with TypeScript or custom native modules
• 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
• Have contributed to internal tools, processes, or systems that improved mobile developer velocity or code quality