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

We're partnering with a high-performance quantitative trading firm to hire a Front-End Engineer with deep React experience to work on the firm's internal trading, research, and risk platforms.This is a front-end role for engineers who care about architecture, performance, and correctness, and who want to build interfaces used by traders and quantitative researchers making real-time decisions. The RoleYou'll own and evolve complex, data-heavy web applications that visualise live market data, research outputs, and trading activity. The emphasis is on robust engineering, not marketing websites - accuracy, latency, and usability matter.You'll work closely with backend engineers, quants, and traders to design interfaces that are fast, reliable, and intuitive under pressure. Key ResponsibilitiesDesign and build complex React applications used in live trading and research workflowsDevelop reusable, well-structured component libraries and front-end architectureOptimise rendering performance for real-time and high-frequency data visualisationCollaborate with backend teams on APIs, data contracts, and system designWrite well-tested, maintainable code with a strong focus on correctness and usability Core Technical RequirementsStrong professional experience with React and modern JavaScript / TypeScriptDeep understanding of front-end architecture, state management, and component designExperience handling large, dynamic data sets in the browserStrong grasp of performance optimisation (rendering, memoisation, data flow)Experience working in a Linux / Git-based engineering environment Additional Technologies (Nice to Have)Experience with one or more of the following is a strong plus:Next.js or similar modern React frameworksWebSockets, streaming data, or real-time UI updatesD3.js, charting libraries, or custom data visualisationBackend languages such as Python, C++, Java, or GoFamiliarity with GraphQL, RESTful APIs, or event-driven systems Nice to Have (But Not Required)Exposure to financial markets, trading systems, or time-series dataExperience working closely with quantitative or highly technical usersKnowledge of testing frameworks and front-end tooling (Jest, Playwright, etc.)Interest in UI/UX design, without sacrificing engineering rigour