Founding Product Engineer in London

Founding Product Engineer in London

London Full-Time No working from home possible
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Engineering London Full-time


We are hiring a Product Engineer to join the founding team and build products for our AI-native certification process. We are hiring a Product Engineer to join the founding team and build products for our AI-native certification process.


You should be language-agnostic, reason from first principles, and use LLMs in your daily engineering workflow. You should be language-agnostic, reason from first principles, and use LLMs in your daily engineering workflow.



  • Own products across the whole stack. Build and ship across front-end, back-end and AI-agent infrastructure.

  • Build products end-to-end. Design systems from discovery through to production.

  • Engineer reliable agent systems. Design harnesses, evals and safeguards that keep quality measurable.


What we're looking for W h a t w e ' r e l o o k i n g f o r



  • Demonstrable AI engineering depth. You can show real systems where you made substantive decisions about agent harnesses, evals, hallucination containment, performance, agent sandboxing or MCP/tool design.

  • Strong product engineering and technical judgment. You ship across interface, backend, data and deployment, reason from first principles and choose tools deliberately.

  • Product instinct and clear collaboration. You ask good questions, form a view, test quickly, communicate clearly and care whether the work changes outcomes.

  • Evidence of shipped work. Show us professional work, open-source contributions, personal products, research or hackathon results. Roughly 2+ years of experience is useful, but evidence matters more than tenure.

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Contact Details:

Calibre Technologies Inc. Recruitment Team