UI Developer

UI Developer Contract: 6 Months Location: Hybrid - Central London (2 days onsite) Rate: £524 per day (Umbrella / Inside IR35) We're looking for a hands-on UI Developer with strong core JavaScript fundamentals to join a high-performing team delivering modern, scalable front-end solutions. This role requires more than framework knowledge - we're looking for developers who can think critically, solve problems in real time, and confidently work with complex data structures. ⚠️ Interview Process (Important) Candidates will complete live JavaScript problem-solving exercises These will focus on practical data manipulation and problem-solving, not abstract algorithm challenges You will be expected to write, explain, and iterate on solutions in real time What You'll Be Doing Building and enhancing high-quality, responsive UI components and applications Developing and maintaining component libraries and design systems Working extensively with complex data structures, including transforming and visualising data in UI grids and dashboards Collaborating closely with designers, product owners, and backend teams Writing clean, well-tested, and maintainable TypeScript code Driving best practices in UI architecture, performance, and accessibility Key Skills & Experience Strong hands-on experience with: React TypeScript / JavaScript (ES6+) Storybook Tailwind CSS Vite VitestCore fundamentals are essential: Strong understanding of JavaScript fundamentals (loops, functions, closures, etc.) Proven ability to manipulate and transform data structures Confidence solving problems involving string manipulation and iterative logic Ability to clearly explain thought processes and multiple approaches to solutionsAdditional: Proven experience building component libraries/design systems and end-user applications Familiarity with ShadCN and/or Radix UI (desirable) Strong understanding of modern front-end tooling and workflows Comfortable working with an IDE and standard development environments