Senior React Developer - Banking, Data Visualisation

Senior React Developer – Front Office, Real-Time Visualisation sought by leading investment bank based in Canary Wharf. **Inside IR35 – 3 days a week on site** We are seeking an experienced React Developer to join our front office development team. The ideal candidate will have extensive experience building high-performance, real-time user interfaces with exceptional attention to detail and a focus on low-latency rendering. This role requires a deep understanding of modern React architecture, structured coding principles, and UI/UX best practices. Key Responsibilities Design and implement complex, real-time dashboards and interactive UIs for mission-critical financial applications Optimize front-end performance to achieve microsecond-level responsiveness in data visualization components Develop reusable component libraries that maintain consistency across applications Implement robust error handling and resilience patterns for real-time data streams Participate in code reviews and mentor junior developers on best practices Work closely with back-end teams to integrate with real-time data services Required Skills & Qualifications 5+ years of professional experience with React.js and modern JavaScript (ES6+) Proven experience building low-latency, real-time user interfaces (trading platforms, analytics dashboards, etc.) Deep understanding of React performance optimization techniques (virtualization, memoization, code splitting) Experience with state management solutions (Redux, MobX, Recoil, or similar) Proficiency with WebSockets or other real-time data protocols Strong knowledge of responsive design and cross-browser compatibility Experience with testing frameworks (Jest, React Testing Library, Cypress) Excellent understanding of clean code principles and component architecture Strong system design skills with experience creating scalable front-end architectures Preferred Qualifications Experience with TypeScript and strong typing methodologies Knowledge of financial domain concepts (for trading/banking applications) Experience with data visualization libraries (D3.js, HighCharts, etc.) Familiarity with micro-frontend architecture Experience with GraphQL and/or REST API design CI/CD pipeline experience and deployment automation Experience with performance monitoring tools Education Bachelor\’s degree in Computer Science, Software Engineering, or related field (or equivalent professional experience) Please apply within for further details or call on 07393149627 Alex Reeder Harvey Nash Finance & Banking #J-18808-Ljbffr