Founding Product Engineer

TechTree is recruiting on behalf of a client — a seed-stage AI security company backed by Entrepreneur First and the Sequoia Scout Fund, building AI-native infrastructure to protect critical institutions from attack.

Founding Product Engineer

Location: On-site in London (King’s Cross). Founding-team scope.

About The Role

This is not a UI cleanup role. You will own the full product end-to-end, shipping features that enterprise security teams rely on — and working directly with AI engineers to turn model outputs into trusted product capabilities.

What You’ll Do

• Own UI, API, and agent-powered product features end-to-end.
• Design and build robust, secure web applications for enterprise customers.
• Collaborate with AI engineers to integrate research into production-grade features.
• Build developer-friendly APIs and contribute to frontend architecture decisions.
• Ship fast, iterate with users, and maintain high quality throughout.

What We’re Looking For

• Strong full-stack engineering — comfortable owning both frontend and backend.
• Track record of shipping high-quality product in fast-paced environments.
• Experience with TypeScript, React, Node.js; Rust is a plus.
• Cloud infrastructure comfort — Azure, Docker, CI/CD.
• Bonus: experience with LLM/AI APIs in production; cybersecurity or enterprise SaaS background.

What’s On Offer

• Founding-team equity.
• Competitive salary.
• Real technical ownership — not a ticket-taking role.
• Direct collaboration with founders.
• On-site.
• King’s Cross, London.

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