Senior Frontend Engineer — Craft Fast, Scalable UIs

Trading 212; Poland; On-site; PLN 220,000 - 360,000; Full time

Job summary

Trading 212 is seeking a Senior Frontend Engineer to own complex frontend features across web and mobile. You will design scalable React and React Native architectures and work closely with product and QA to translate requirements into smooth user experiences.

You will focus on performance, code quality, and mentoring colleagues while maintaining autonomy in small teams and a weekly release rhythm. This role values initiative, deep frontend fundamentals, and the ability to learn new technologies

Qualifications

• Production frontend systems built with React or React Native and TypeScript.
• Knowledge of React rendering, component boundaries, data flow, and state management.
• Experience 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 and ability to learn new technologies.

Responsibilities

• Own 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

Frontend ownership

React & React Native

TypeScript

Rendering & state management

Frontend architecture

Performance optimization

Testing discipline

Problem-solving

Learning agility

Job description

Trading 212 is seeking a Senior Frontend Engineer to own complex frontend features across web and mobile. You will design scalable React and React Native architectures and work closely with product and QA to translate requirements into smooth user experiences.

You will focus on performance, code quality, and mentoring colleagues while maintaining autonomy in small teams and a weekly release rhythm. This role values initiative, deep frontend fundamentals, and the ability to learn new technologies