Full Stack Engineer - React / Node - £120K ( Remote / London)

Our client is a Series B Agentic AI startup building a platform that lets enterprises delegate repetitive tasks to an AI-powered digital workforce, delivering major gains in productivity across business functions.

Founded by former executives from Google, Coinbase, Flipkart and Okta, the team includes engineers from top tech companies and graduates of Stanford, MIT, UC Berkeley, CMU and the IITs. Backed by leading investors including Accel, Naspers/Prosus and Section32, with offices in Silicon Valley, London, Bangalore and Vancouver, this is a company shipping real AI systems into production at scale.

In this role, you will:

• Design and build exceptional web UIs using modern front-end technologies (HTML, CSS, JavaScript, React)
• Work closely with product and UX to shape requirements, wireframes and high-fidelity prototypes
• Build and maintain API integrations between front-end and back-end using React and gRPC
• Contribute to back-end development, building robust APIs with Node.js or Python
• Build, test and deploy full-stack applications, ensuring performance, scalability and responsiveness
• Optimise for performance, accessibility and SEO
• Troubleshoot UI and back-end issues across platforms and devices
• Write clean, well-documented code and deploy/debug via platforms like Vercel

Ideally you'd have:

• Bachelor's in Computer Science or related field, or equivalent experience
• 4+ years' full-stack experience, with strength in front-end and API integration
• Strong HTML/CSS/JavaScript, extensive React experience
• Experience with gRPC and familiarity with REST, JSON, XML, OAuth
• Solid back-end skills (Node.js or Python) with frameworks like FastAPI or Express
• Familiarity with Git and deploy platforms such as Vercel
• Strong problem-solving skills and a high bar for user experience
• Strong communicator, comfortable working independently and in a team