Senior Frontend Engineer: Build Scalable React/TypeScript Apps

Trading 212; Poland; On-site; PLN 180,000 - 240,000; Full time

Job summary

Trading 212 is seeking Senior Frontend Engineers in Poland to own frontend features across web and mobile. You will design, evolve systems and libraries, and address rendering, state management and performance bottlenecks.

You’ll collaborate with product, backend engineering and QA to translate complex requirements into intuitive experiences. We value strong TS knowledge, clear problem solving, and a track record of maintainable frontend architecture, with a focus on testing and quality

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.
• A track record of designing maintainable frontend architecture and reusable abstractions.
• Practical 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 the 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 architecture

Performance debugging

Problem solving

Tools

TanStack Query

Zustand

Playwright

Detox

Jest

Nx

pnpm

Job description

Trading 212 is seeking Senior Frontend Engineers in Poland to own frontend features across web and mobile. You will design, evolve systems and libraries, and address rendering, state management and performance bottlenecks.

You’ll collaborate with product, backend engineering and QA to translate complex requirements into intuitive experiences. We value strong TS knowledge, clear problem solving, and a track record of maintainable frontend architecture, with a focus on testing and quality