Topstep

Topstep

Mobile Engineer III

United States · Mid · Full-time

Sponsorship not specified$132k-$168kDetected 4 days ago
JavaScriptTypeScriptJavaSwiftKotlinReactReduxReact NativeiOSAndroidObjective-CBackend DevelopmentCode ReviewSQLPostgreSQLCI/CDGraphQLWebSocketsOAuthCybersecurityDesign SystemsJestAppiumLeadership

About the role

  • This is an opportunity to shape the mobile experience for traders and set the technical foundation that will scale across both our trader experience and trading experience platforms.
  • This role is ideal for someone who brings both deep React Native expertise and a product mindset.
  • Join us and help define what mobile excellence looks like at Topstep.

Responsibilities

  • Contribute to end-to-end mobile features from design through App Store and Play Store releases, ensuring seamless integration with backend services and optimal performance.
  • Embed within feature teams after MVP launch to drive ongoing mobile development, bringing mobile expertise to cross-functional squads.
  • 3 + years of professional experience building production mobile applications, with demonstrated impact in establishing patterns and practices that scaled across multiple teams.
  • Understanding of mobile CI/CD, including automated builds, code signing, TestFlight/Play Store distribution, and release management.
  • Excellent communication skills with the ability to explain mobile-specific constraints and trade-offs to varied audiences and build consensus across teams.

Requirements

  • Partner with product and design to translate trader needs into mobile experiences that balance user experience with technical constraints and platform capabilities.
  • Deep React Native expertise, including navigation (React Navigation), state management (Redux, Zustand, Context), native module integration, and performance optimization.
  • Cross-platform mobile development experience shipping apps to both iOS App Store and Google Play Store, including an understanding of platform-specific differences and capabilities.
  • Strong database fundamentals, including experience with PostgreSQL or SQL Server-schema design, migrations, indexing, and query optimization.
  • Track record of technical leadership through architectural documentation, code reviews, component libraries, and establishing mobile engineering standards.

Nice to have

  • Background with native iOS (Swift/Objective-C) or Android (Kotlin/Java) development, and understanding when to drop down to native code.
  • Experience with real-time data integration using WebSockets or Server-Sent Events.
  • Familiarity with mobile authentication patterns (biometrics, OAuth, secure token storage).
  • Experience with complex mobile UI patterns (charts, animations, gesture handling).
  • Experience with Expo or similar React Native development platforms.
  • Understanding of mobile security best practices and secure coding for sensitive financial data.
  • We foster a culture of collaboration by keeping cameras on during meetings and maintaining a robust Slack environment for communication.
  • The compensation offered will take into account the internal compensation structure and may vary depending on the candidate's geographic region, job-related knowledge, skills, and experience, among other factors.

Skills

  • Notice Pursuant to 775 ILCS 5/2-102(L).
  • Topstep LLC uses artificial intelligence ("AI") in connection with its recruitment and hiring process.

Compensation

  • New Hire Base Salary Range

Equal opportunity

  • Employer
  • Topstep is an Equal Opportunity Employer. We are committed to fostering an inclusive environment where all employees and applicants are valued. All qualified candidates will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, age, disability, or veteran status, in compliance with applicable federal, state, and local laws.
  • Interested in the role? Apply today with your resume!
  • Notice of Use of Artificial Intelligence in Recruitment and Hiring: Notice Pursuant to 775 ILCS 5/2-102(L). Topstep LLC uses artificial intelligence ("AI") in connection with its recruitment and hiring process. Examples include, but are not limited to, AI tools used to improve job descriptions, generate interview questions, draft communications, assist with scheduling, and source candidates, as well as AI features built into third-party platforms such as LinkedIn, Indeed, and Glassdoor. Topstep will not use AI that has the effect of subjecting employees or applicants to discrimination on the basis of any protected class under the Illinois Human Rights Act.
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This listing is sourced directly from Topstep's careers page and normalized into a canonical job model.