React Developer

Robert Half is recruiting for a React Developer to join a market leading financial services organisation on a contract.

**This Role is Outside IR35**

ROLE: React Developer

LENGTH: 3 Months rolling

LOCATION: London based - 3 days in office

PAY: Outside IR35

The Opportunity

An exciting contract opportunity is available for a highly experienced Senior Front-End Engineer to lead the development of a brand-new, secure, data-driven analytics platform. This role focuses on building a modern web application from the ground up, working alongside backend engineers, UX designers, and security teams.

You will take ownership of the front-end architecture and delivery, ensuring high standards across performance, usability, and security in a regulated environment.

The Role

You will design and build a high-performance front end using React and TypeScript, creating complex dashboards and workflows that integrate with backend services via APIs.

This is a hands-on role covering the full development lifecycle, from early design through to production, testing, and optimisation.

Key Responsibilities

• Lead the front-end build of a scalable React & TypeScript application from scratch
• Develop data-heavy user interfaces including dashboards, tables, filters, and multi-step workflows
• Implement robust state management and efficient data-fetching patterns
• Optimise performance (rendering, bundle size, large datasets, and network efficiency)
• Collaborate with backend teams on API design and integration
• Apply secure development practices and ensure data protection standards
• Ensure accessibility and usability across complex interfaces
• Maintain high code quality through testing, reviews, and CI/CD practices
• Contribute to build pipelines, deployment processes, and documentation

Required Skills & Experience

Must Have:

• Strong commercial experience building modern React applications
• Advanced TypeScript skills
• Proven experience designing scalable front-end architecture
• Experience delivering complex, data-intensive UIs (dashboards, grids, workflows)
• Strong understanding of performance optimisation for large datasets
• Experience with state management and data-fetching tools (e.g. TanStack Query)
• Solid testing practices and code quality standards
• Experience working in secure or regulated environments
• Hands-on experience with D3.js and building interactive data visualisations
• Strong charting experience (custom charts, performance-focused rendering, and data visualisation best practices)

Nice to Have

• Experience with Next.js (SSR, routing, performance considerations)
• Knowledge of CDN-hosted SPAs and caching strategies
• Familiarity with authentication/identity systems (OAuth2, OIDC)
• Experience with real-time data (WebSockets, SSE)
• Exposure to BI tools or reporting platforms

If this is of interest please apply or send CV to taryn.seidle@roberthalf.co.uk