Information Security Analyst à Grande-Bretagne

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.

• 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

• 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

• 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

• 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