Front-End React Software Engineer : Trading : £120-180k plus excellent bonus : London

We’re partnering with a high-performance quantitative trading firm to hire a Front-End Engineer (React) to help shape the internal platforms that power their trading, research, and risk decision-making. If you care about architecture, performance, and building interfaces that hold up under pressure, this is firmly in your lane. The Role You’ll take ownership of complex, data-rich web applications that surface live market data, research insights, and trading activity in real time. These are mission-critical tools used by traders and quantitative researchers operating in fast-moving environments. Expect to think deeply about latency, rendering performance, and information density , not just UI polish. You’ll work side-by-side with backend engineers, quants, and traders to design interfaces that remain fast, reliable, and intuitive even when the data is moving quickly and the stakes are high. Key Responsibilities Build and evolve advanced React applications used in live trading and research workflows Design scalable front-end architectures and reusable component systems Optimise performance for real-time, high-volume data visualisation Partner with backend engineers on APIs, data contracts, and system design Deliver well-tested, maintainable code with a strong bias toward correctness and reliability Core Technical Requirements Strong commercial experience with React and modern TypeScript/JavaScript Deep understanding of front-end architecture, state management, and component design patterns Experience working with large, rapidly changing datasets in the browser Strong grasp of performance optimisation (rendering strategies, memoisation, data flow) Comfort working in a Linux-based, Git-driven engineering environment BSc or MSc in Computer Science or similar Additional Technologies: Next.js or other modern React frameworks WebSockets, streaming data, or real-time UI systems D3.js, advanced charting, or custom data visualisation work Backend experience with Python, C++, Java, or Go Familiarity with GraphQL, REST APIs, or event-driven architectures Bonus: Exposure to financial markets, trading systems, or time-series data Experience collaborating closely with quants or highly technical end users Familiarity with front-end testing/tooling (Jest, Playwright, etc.) Interest in UI/UX, balanced with strong engineering discipline