Mobile Engineer III
T
TopstepFintech Trading
United StatesFull-TimeSenior
Salary$132,000 - $168,000 annually.
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Job Details
- Experience
- 3+ years
- Required Skills
- GraphQLPostgreSQLJavascriptJestMicrosoft SQL ServerReact NativeTypeScript
Requirements
- 3+ years of professional experience building production mobile applications.
- Deep React Native expertise, including navigation, state management, native module integration, and performance optimization.
- Strong TypeScript and modern JavaScript foundation with understanding of React patterns and hooks.
- Experience shipping apps to both iOS App Store and Google Play Store.
- GraphQL client integration experience using Apollo Client or similar.
- Strong database fundamentals, including PostgreSQL or SQL Server-schema design.
- Experience with mobile performance optimization including bundle size, memory management, and list virtualization.
- Production experience with crash reporting (Sentry, Crashlytics) and analytics.
- Testing mindset with experience in unit, integration, and E2E tests (Jest, Detox, Appium).
- Understanding of mobile CI/CD, code signing, and release management.
- Track record of technical leadership through architectural documentation, code reviews, and standards setting.
- Excellent communication skills with the ability to explain mobile-specific constraints.
Responsibilities
- Contribute to the mobile MVP effort to establish our React Native application from the ground up, integrating with GraphQL APIs.
- Establish engineering patterns for React Native development, including reusable components, custom hooks, TypeScript patterns, and testing strategies.
- Contribute to end-to-end mobile features from design through App Store and Play Store releases.
- Partner with product and design to translate trader needs into mobile experiences.
- Contribute to mobile quality and performance by embedding testing, monitoring, crash reporting, and performance optimization into every feature.
- Embed within feature teams after MVP launch to drive ongoing mobile development.
- Uphold React Native best practices, mobile-specific architectural thinking, and production ownership.
- Champion mobile-first thinking across the organization.
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