Senior Frontend Engineer - Web & Mobile (React/TS)

Trading 212 Ltd.; Polska; On-site; PLN 240,000 - 360,000; Full time

Job summary

Trading 212 Ltd. is seeking Senior Frontend Engineers to join our frontend platform spanning web and mobile using TypeScript, React, and React Native.

You will work in small, autonomous teams with weekly releases and end-to-end ownership from problem definition through production. You will design and evolve shared libraries, identify performance bottlenecks, and collaborate with product, backend engineering and QA to translate complex requirements into intuitive user experiences.

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 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 judgment 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.
• 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 optimization

Problem solving

Communication

Job description

Trading 212 Ltd. is seeking Senior Frontend Engineers to join our frontend platform spanning web and mobile using TypeScript, React, and React Native.

You will work in small, autonomous teams with weekly releases and end-to-end ownership from problem definition through production. You will design and evolve shared libraries, identify performance bottlenecks, and collaborate with product, backend engineering and QA to translate complex requirements into intuitive user experiences.