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Mobile Engineer III

1 day, 5 hours ago
United States
Full-time
Mid Level
Mobile Engineer
Mobile Development
Appium Detox Expo GraphQL Java JavaScript Jest Kotlin OAuth Objective-C PostgreSQL React Native SQL Server Swift TypeScript WebSockets
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Topstep

Topstep

Topstep is a premier futures prop trading firm that helps individuals become funded traders through their Trading Combine® program, offering a safe and professional environment to trade forex and futures contracts with the company's capital.

Capital Markets
51-250
Founded 2012
View All Jobs 4

Description

  • Contribute to the mobile MVP by building the React Native application from the ground up and integrating with GraphQL APIs.
  • Establish reusable engineering patterns for React Native development, including components, hooks, TypeScript patterns, and testing strategies.
  • Deliver end-to-end mobile features from design through App Store and Google Play release.
  • Partner with product and design to turn trader needs into mobile experiences.
  • Embed testing, monitoring, crash reporting, and performance optimization into shipped features.
  • Join feature teams after MVP launch to drive ongoing mobile development.
  • Uphold React Native best practices, mobile architectural thinking, and production ownership.
  • Champion mobile-first thinking across the organization and help other teams understand mobile constraints and opportunities.

Requirements

  • 3+ years of professional experience building production mobile applications.
  • Deep React Native expertise, including React Navigation, Redux, Zustand, Context, native module integration, and performance optimization.
  • Strong TypeScript and modern JavaScript skills, with knowledge of React patterns, hooks, component composition, and functional programming.
  • Experience shipping cross-platform mobile apps to both the iOS App Store and Google Play Store.
  • Experience integrating GraphQL clients such as Apollo Client, including cache management, optimistic updates, and error handling.
  • Strong database fundamentals, including PostgreSQL or SQL Server schema design, migrations, indexing, and query optimization.
  • Experience with mobile performance optimization, including bundle size, startup time, memory management, list virtualization, and image optimization.
  • Experience with crash reporting and production tooling such as Sentry, Crashlytics, analytics, and remote config.
  • Testing experience with Jest, integration tests, and E2E tools such as Detox or Appium.
  • Understanding of mobile CI/CD, including automated builds, code signing, TestFlight/Play Store distribution, and release management.
  • Track record of technical leadership through documentation, code reviews, component libraries, and engineering standards.
  • Excellent communication skills and ability to explain mobile trade-offs to varied audiences.
  • Preferred: experience building financial, trading, or fintech mobile applications.
  • Preferred: native iOS or Android development experience with Swift, Objective-C, Kotlin, or Java.
  • Preferred: experience with WebSockets or Server-Sent Events, mobile authentication patterns, charts, animations, gesture handling, shared component libraries, Expo, and mobile security best practices.

Benefits

  • Flexible work environment ranging from fully remote to hybrid.
  • Seven company-paid holidays.
  • Generous family leave.
  • Paid time off is front-loaded.
  • 401(k) matching for full-time employees.
  • Health, dental, and vision insurance for full-time employees.
  • Bonus for taking 5 consecutive vacation days.
  • Food and groceries budget plus contributions toward health and wellness.
  • Performance-based bonus eligibility.
  • Base salary range of $132,000 to $168,000 annually.

Interested in this position?

Apply directly on the company website

Apply Now

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