Front End Developer - SC Cleared - Outside IR35

Location: London Clearance: Active SC or DV required Rate: Competitive / Negotiable (Outside IR35) Duration: 6 Months (scope to extend) I'm looking for a Senior Frontend Engineer to join a fast-growing UK Defence tech innovator building a generative AI chat platform. You'll be owning the user-facing experiences end-to-end, architecting and delivering performant, scalable, and accessible applications that make advanced AI capabilities intuitive and engaging for end users. This is a hands-on role where you'll partner with backend and AI teams, have a direct impact on product direction, and set the standard for modern frontend practices. Essential Experience: ☑️ 5 years of frontend development with React & TypeScript in production ☑️ Proven track record architecting complex SPAs with modern routing (React Router v7) ☑️ Strong knowledge of state management (Zustand, TanStack Query) ☑️ Skilled in Vite, pnpm, and Git workflows ☑️ Experience integrating with APIs (OpenAPI / Orval) and real-time features (WebSockets, streaming data) ☑️ Deep understanding of browser APIs, performance optimisation, and responsive design ☑️ Strong experience with authentication flows (Azure MSAL/OAuth2) ☑️ Excellent communicator, able to mentor and influence frontend standards Nice to Have: ✨ Experience with AI SDK React and streaming endpoint integrations ✨ Familiarity with Tailwind CSS v4 and Shadcn/ui component systems ✨ Knowledge of CI/CD pipelines (GitHub Actions) and containerisation (Docker) ✨ AWS deployment experience (CloudFront/S3, caching/CDN strategies) ✨ Exposure to accessibility standards (WCAG 2.1 AA) and testing frameworks (unit/integration/E2E) ✨ Interest in security best practices (CSP headers, XSS prevention, secure API comms) If this is something of interest, feel free to apply or email me at

Location: London, UK, GB

Posted Date: 10/30/2025