Senior Frontend Engineer - React & React Native Leader

Trading 212; Poland; On-site; PLN 140,000 - 210,000; Full time

Job summary

Trading 212 in Poland seeks a Senior Frontend Engineer to own complex frontend features across web and mobile using React, React Native and TypeScript. You will collaborate in small, autonomous teams with a weekly release cadence and take ownership from problem definition through production.

You will design durable frontend architectures, optimize performance, and mentor teammates while maintaining high-quality code through reviews and tests.

Qualifications

• Proven ownership of production frontend systems built with React or React Native and TypeScript.
• Strong knowledge of React rendering, component boundaries, data flow and state management.
• Track record designing maintainable frontend architecture and reusable abstractions.
• Experience diagnosing performance problems in complex web or mobile products.
• Sound testing judgement across unit, end-to-end and visual-regression coverage.
• Clear, structured problem-solving and ability to explain technical decisions and trade-offs.
• Strong engineering fundamentals, product judgement and confidence learning unfamiliar technologies.

Responsibilities

• Own complex frontend features end to end across web and mobile.
• Design and evolve React and React Native systems, shared libraries and durable abstractions.
• Identify and resolve rendering, state-management, bundle and runtime-performance bottlenecks.
• Use TypeScript to make behaviour explicit and prevent defects rather than suppressing type errors.
• Work closely with product, backend engineering and QA to turn complex requirements into simple user experiences.
• Keep quality high through code review, unit, end-to-end and visual-regression testing.
• Share knowledge, mentor colleagues and raise the frontend engineering standard.

Skills

React/React Native

TypeScript

Frontend ownership

Performance diagnosis

Frontend architecture

Testing judgement

Problem solving

Learning adaptability

Job description

Trading 212 in Poland seeks a Senior Frontend Engineer to own complex frontend features across web and mobile using React, React Native and TypeScript. You will collaborate in small, autonomous teams with a weekly release cadence and take ownership from problem definition through production.

You will design durable frontend architectures, optimize performance, and mentor teammates while maintaining high-quality code through reviews and tests.