Senior React Native Engineer

Location: Poland

Department: OANDA Team

N-iX is looking for a Senior React Native Engineer to join our tight-knit, 6-person Mobile Engineering Team. You will work on a production brownfield React Native codebase embedded within native iOS and Android hosts, managing interconnected internal packages that power high-performance, real-time trading interfaces. In a highly agile setup, you will collaborate closely with the team to deliver a fast, reliable, and fault-tolerant mobile experience where correctness, low latency, and exceptional user experience are paramount.

In this role, you will:

• Develop and ship new features for a high-performance React Native codebase embedded within native iOS and Android hosts.
• Drive architecture and code quality, leading proofs-of-concept for new patterns, improving developer experience, and ensuring high UI responsiveness for real-time trading.
• Design and align RESTful API contracts in close collaboration with backend, product, and UX Design Teams.
• Write reusable, well-tested, and maintainable code, taking full ownership across all stages of the mobile software development lifecycle.
• Elevate team engineering standards through thorough code reviews, technical mentorship, and active participation in agile planning sessions.
• Own end-to-end delivery, taking features from concept to production release within your first three months while contributing to overall application architecture.

Requirments:

• 5+ years of proven senior-level experience in building, developing, and scaling React Native applications in a production environment.
• Solid background in mobile application development, understanding platform-specific nuances across iOS and/or Android.
• Deep TypeScript mastery, with strong experience navigating strict configurations across large, shared codebases.
• Hands-on experience in building and optimizing React Native architecture (including native modules, Fabric, TurboModules, Hermes, and the New Architecture).
• Solid data-fetching and cache-management skills using React Query (v4/v5) to ensure consistent server state across screens.
• A forward-thinking mindset and enthusiasm for modern tools, including a practical, open approach to leveraging AI-assisted development tools to boost productivity.
• English level - upper-intermediate

Nice to have:

• Strict testing discipline (Jest, React Native Testing Library) as an integrated part of your development workflow.
• Hands-on experience with monorepos and internal packages (e.g., Lerna, Nx, npm workspaces).
• Experience in FinTech, trading platforms, or high-throughput real-time systems.