Key skills
React NativeSwiftObjective-CKotlinJavaMobile performance optimizationMemory managementMobile APIsPush notificationsDeep linkingA/B testing frameworksCAIAnalyticsReactiOSAndroidMentoringA/B TestingCollaboration
About this role
Upstart is an AI lending marketplace focused on reducing the cost and complexity of borrowing for Americans. They are seeking a Senior Mobile Engineer to design and build high-quality mobile applications using React Native, collaborating closely with product managers, designers, and backend engineers to enhance 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
- 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