2 months ago
USA (city not specified)Senior
Base Salary
$155k - $200k/yr
Responsibilities
- Build Topstep’s mobile MVP using React Native and TypeScript while integrating GraphQL APIs.
- Establish mobile architecture patterns, reusable components, and engineering practices for feature teams.
- Own mobile features end-to-end through technical design, release, monitoring, and iteration on iOS and Android.
- Design responsive mobile experiences for high volumes of real-time trading data across devices and network conditions.
- Improve product quality through testing, monitoring, performance optimization, secure handling of trader information, and production debugging.
- Collaborate with product, design, backend, and quality engineering partners to deliver mobile features.
- Mentor engineers through code reviews and pairing, and communicate mobile constraints and opportunities across the organization.
- Participate in agreed support or on-call responsibilities after onboarding.
Requirements
- At least 5 years of professional experience building and shipping production mobile applications, including several years of hands-on React Native development.
- Deep React Native expertise and strong TypeScript and modern JavaScript fundamentals, including navigation, state management, hooks, and component design.
- Experience shipping applications to both iOS and Android, including platform differences, build and release pipelines, and app-store distribution.
- Experience integrating GraphQL APIs with client caching, mutations, and error handling.
- Experience improving mobile performance and reliability through profiling, secure session handling, and production debugging.
- Practical experience writing unit, integration, and end-to-end tests for mobile applications.
- Demonstrated ownership of features and experience supporting technical decisions, code reviews, reusable components, and mentoring.
- Clear communication and pragmatic engineering judgment.
- Preferred: real-time data integration using WebSockets or similar streaming connections.
- Preferred: native iOS or Android development, including work at the React Native/native boundary.
- Preferred: complex mobile interfaces such as charts, animations, or gesture handling.
- Preferred: Expo or comparable React Native tooling.
- Preferred: trading, financial, or fintech product experience.
Benefits
- The position may be fully remote or hybrid.
- Seven company-paid holidays, generous family leave, and front-loaded paid time off are provided.
- Full-time employees are eligible for 401(k) matching and health, dental, and vision insurance.
- The company encourages vacations with a bonus for taking five consecutive days.
- Food and groceries support and health and wellness contributions are offered.
Tech Stack
Categories
Mobile
About Topstep
Topstep runs a simulated evaluation and funding program for retail futures traders, offering the chance to trade live markets with the firm’s capital after passing risk-focused tests. It also builds tools and education, including the TopstepX trading platform and a custom real-time charting engine. Founded in 2012 and headquartered in Chicago, the privately held company monetizes access to evaluations and trader services.