Senior Mobile Developer (React Native)

About the role

StoneX Group is seeking a Senior Mobile Developer to design and build high‑performing, enterprise‑grade applications using React Native for both iOS and Android platforms. You will join a talented engineering team working on low‑latency, mission‑critical trading solutions.

Key responsibilities

• Architect, develop, and maintain complex mobile applications across the full software development lifecycle.
• Collaborate within an Agile environment, contributing to design, coding, testing, and release processes.
• Mentor junior engineers, provide technical direction, and drive continuous improvement through technology research and architectural reviews.

Required profile

• Minimum 5 years of professional experience in mobile app development for Android and iOS.
• Proven ability to deliver applications to Google Play and the App Store and to optimise performance, memory usage and load times.

Required skills

• React Native and its core principles
• JavaScript, TypeScript, ES6/ES10, JSX
• Android and iOS development, including deployment to Google Play/App Store
• State‑management libraries, routing architecture, and code‑reuse patterns
• Experience with networking, asynchronous programming, and image‑loading libraries
• Familiarity with AI coding assistants such as Claude Code, GitHub Copilot, and Codex
• Agile development methodology