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 RoleYou'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 ResponsibilitiesBuild and evolve advanced React applications used in live trading and research workflowsDesign scalable front-end architectures and reusable component systemsOptimise performance for real-time, high-volume data visualisationPartner with backend engineers on APIs, data contracts, and system designDeliver well-tested, maintainable code with a strong bias toward correctness and reliability Core Technical RequirementsStrong commercial experience with React and modern TypeScript/JavaScriptDeep understanding of front-end architecture, state management, and component design patternsExperience working with large, rapidly changing datasets in the browserStrong grasp of performance optimisation (rendering strategies, memoisation, data flow)Comfort working in a Linux-based, Git-driven engineering environmentBSc or MSc in Computer Science or similar Additional Technologies:Next.js or other modern React frameworksWebSockets, streaming data, or real-time UI systemsD3.js, advanced charting, or custom data visualisation workBackend experience with Python, C++, Java, or GoFamiliarity with GraphQL, REST APIs, or event-driven architecturesBonus:Exposure to financial markets, trading systems, or time-series dataExperience collaborating closely with quants or highly technical end usersFamiliarity with front-end testing/tooling (Jest, Playwright, etc.)Interest in UI/UX, balanced with strong engineering discipline