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Upstart Logo

Principal Mobile Software Engineer

Upstart

$186,100 - $257,500
Oct 26, 2025
Remote, US
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Upstart is looking to scale and refine its React Native architecture to become a truly mobile-first company, improving user engagement, increasing retention, and unlocking new growth channels through mobile innovation.

Requirements

  • Have 8+ years of professional software development experience, including meaningful contributions to production mobile apps.
  • Have built and maintained features in both React Native and at least one native platform (e.g., Swift/Objective-C for iOS or Kotlin/Java for Android).
  • Understand the nuances of mobile performance, memory management, and platform-specific challenges.
  • Have led architecture planning and helped engineering teams make informed tradeoffs.
  • Have supported or led the migration of native apps to React Native, or introduced native modules into React Native codebases.
  • Have supported or led the introduction of React Native on the Android platform.
  • Are comfortable working with TypeScript or custom native modules.

Responsibilities

  • Drive technical strategy for our mobile apps — from platform architecture to product scalability and developer experience.
  • Build foundational systems in React Native that enable fast, high-quality feature development across both iOS and Android.
  • Collaborate with product and design to scope, implement, and launch user-facing features that align with company goals.
  • Bridge mobile and backend systems by shaping APIs and improving client-server interaction patterns.
  • Identify friction in the mobile development lifecycle and lead improvements to tooling, modularization, CI, and testing strategies.
  • Mentor engineers and help grow a culture of ownership, technical rigor, and continuous learning.
  • Influence both product and platform direction as we scale our mobile efforts across multiple surfaces and teams.

Other

  • Communicate early and often with cross-functional partners in product, design, backend, and QA to ensure alignment and shared understanding.
  • Take ownership of your work from design through delivery, and value long-term thinking over quick fixes.
  • Appreciate the strength of diverse perspectives and thrive on being part of an inclusive, collaborative team.
  • Embrace a growth mindset, value mentorship, and enjoy helping others grow.
  • This team operates across all U.S. time zones.