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 [email protected]