Senior React Developer - Banking, Data Visualisation

Harvey Nash Group; London; On-site; GBP 60,000 - 90,000; Full time

Job summary

A leading investment bank in Canary Wharf is seeking a Senior React Developer to join their front office development team. This role involves designing real-time user interfaces and optimizing performance for mission-critical financial applications. The ideal candidate will have extensive experience with React.js and a strong focus on low-latency rendering, contributing to high-performance, interactive dashboards.

Qualifications

• 5+ years of professional experience with React.js and modern JavaScript.
• Proven experience building low-latency, real-time user interfaces.
• Strong knowledge of responsive design and cross-browser compatibility.

Responsibilities

• Design and implement complex, real-time dashboards for financial applications.
• Optimize front-end performance for microsecond-level responsiveness.
• Develop reusable component libraries for consistency across applications.

Skills

React.js

JavaScript (ES6+)

Real-time user interfaces

Performance optimization

State management (Redux, MobX)

WebSockets

Responsive design

Testing frameworks

Clean code principles

System design

Education

Bachelor's degree in Computer Science

Job description

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