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

Financials

51-250 (240)

Founded 2012

2 open positions

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Mobile Engineer III

22 hours, 53 minutes ago

United States

Full-time

Mid Level

Mobile Engineer

Mobile Development

Appium CI/CD Detox Expo GraphQL Java JavaScript Jest Kotlin OAuth Objective-C PostgreSQL React Native SQL Server Swift TypeScript WebSockets

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Topstep

Capital Markets

51-250

Founded 2012

View All Jobs 2

Description

Contribute to building the React Native mobile MVP from the ground up and integrate it with GraphQL APIs.
Establish reusable React Native engineering patterns, components, hooks, TypeScript conventions, and testing strategies.
Develop end-to-end mobile features from design through App Store and Google Play releases.
Partner with product and design to translate trader needs into mobile experiences.
Embed testing, monitoring, crash reporting, and performance optimization into shipped features.
Join feature teams after MVP launch to support ongoing mobile development.
Apply React Native best practices, mobile architecture thinking, and production ownership.
Champion mobile-first thinking across backend and frontend teams.
Help define scalable mobile architecture and standards for the broader organization.

Requirements

3+ years of professional experience building production mobile applications.
Deep React Native experience, including React Navigation, Redux, Zustand, Context, native module integration, and performance optimization.
Strong TypeScript and modern JavaScript skills, with understanding of React patterns, hooks, component composition, and functional programming.
Experience shipping cross-platform 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 with PostgreSQL or SQL Server, including schema design, migrations, indexing, and query optimization.
Experience with mobile performance optimization, including bundle size, startup time, memory management, list virtualization, and image optimization.
Production mobile app experience with tools such as Sentry, Crashlytics, analytics, remote config, and production debugging.
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 architectural documentation, code reviews, component libraries, and engineering standards.
Excellent communication skills and comfort explaining mobile trade-offs to varied audiences.
Pragmatic decision-making ability to balance long-term architecture with MVP delivery.
Preferred: experience building financial, trading, or fintech mobile applications.
Preferred: background in native iOS (Swift/Objective-C) or Android (Kotlin/Java) development.
Preferred: experience with WebSockets or Server-Sent Events for real-time data integration.
Preferred: familiarity with mobile authentication patterns such as biometrics, OAuth, and secure token storage.
Preferred: experience with complex mobile UI patterns, including charts, animations, and gesture handling.
Preferred: background building shared component libraries or mobile design systems.
Preferred: experience with Expo or similar React Native development platforms.
Preferred: understanding of mobile security best practices for sensitive financial data.

Benefits

$132,000 - $168,000 annual base salary.
Eligible for a performance-based bonus.
Fully remote to hybrid work environment.
Seven company-paid holidays.
Generous family leave.
Paid time off is front-loaded.
Competitive 401(k) matching.
Health, dental, and vision insurance for full-time employees.
Vacation encouragement bonus for taking 5 consecutive days.
Food and groceries budget plus contributions toward health and wellness.

Interested in this position?

Apply directly on the company website

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