Senior Mobile Engineer

The role

You will build a mobile trading platform MVP using React Native and TypeScript. You will own mobile features from design through iOS and Android release and establish mobile architecture patterns.

What you will do

• Build the mobile MVP in React Native and TypeScript using GraphQL APIs.
• Establish mobile architecture patterns, reusable components, and engineering practices.
• Own mobile features from technical design through App Store and Play Store releases.
• Partner with product and design to translate trader needs into experiences.
• Design for high volumes of real-time updates.
• Build quality through testing, monitoring, performance optimization, and secure data handling.
• Bring mobile expertise into cross-functional feature teams.
• Mentor engineers through reviews and pairing.
• Champion mobile-first thinking across the organization.
• Support the mobile experience in production and participate in on-call responsibilities.

Required qualifications

• 5 + years of professional experience building and shipping production mobile applications.
• Several years of hands-on React Native development.
• Deep React Native expertise and a strong TypeScript and modern JavaScript foundation.
• Experience shipping applications to both iOS and Android.
• Experience integrating GraphQL APIs.
• Experience improving mobile performance and reliability through profiling and debugging.
• Practical experience writing unit, integration, and end-to-end tests for mobile applications.
• Track record of owning features end-to-end and mentoring other engineers.

Nice to have

• Experience with real-time data integration using WebSockets or similar streaming connections.
• Native iOS or Android development, including work at the React Native/native boundary.
• Experience with complex mobile interfaces such as charts, animations, or gesture handling.
• Familiarity with Expo or comparable React Native tooling.
• Experience building trading, financial, or fintech products.

Benefits

• Seven Company-paid Holidays
• Generous Family Leave
• Paid time off is front-loaded
• 401(k) matching
• health, dental, and vision insurance
• Bonus for taking 5 consecutive days of vacation
• Food and groceries budget
• Contributions towards health and wellness

About the company

Topstep is an engaging working environment that ranges from fully remote to hybrid. They foster a culture of collaboration by keeping cameras on during meetings and maintaining a robust Slack environment.