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UpstartUpstartUnited States

Senior Software Engineer, Mobile

Senior Mobile Engineer building and scaling React Native apps for Upstart's borrower servicing experience across iOS and Android. Requires 4+ years experience, React Native expertise, and native platform familiarity to drive key metrics like payment success and user satisfaction.

167k – 231k/yr
Remote4+ YOEMobile Engineering

About the role

How you’ll make an impact

  • 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.

Minimum Qualifications

  • Bachelor’s degree in Computer Science, Engineering, or Mathematics, or a related field (or its equivalent) and 4 years of experience.
  • 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.

Preferred Qualifications

  • Helped launch or scale a React Native app on the Android platform.
  • Experience with mobile analytics, push notifications, deep linking, or A/B testing frameworks.
  • Worked in a fast-paced product company where mobile was a primary user touchpoint.

Skills

React NativeiOSAndroidSwiftobjective-cKotlinJavamobile performancememory management
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