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iO Associates - UK/EU
Front End Developer - SC Cleared - Outside IR35

Front End Developer - SC Cleared - Outside IR35

On site

London, United kingdom

£ 650 /day

Mid level

Full Time

17-10-2025

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Skills

TypeScript CSS GitHub CI/CD Docker git Azure react tailwind AWS Tailwind CSS CI/CD Pipelines GitHub Actions

Job Specifications

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

About the Company

Specialising in recruitment across the tech, digital, engineering, and government and defence sectors, iO Associates have extensive experience in securing the best talent to create the products and infrastructure of the future. Our dedicated team of highly experienced and knowledgeable consultants provide bespoke solutions, working with businesses to find the perfect fit across contract, interim, search, and permanent appointments. We offer end-to-end support, from Statements of Work and IR35 determination processes to full... Know more