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Founding Product Engineer

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Calibre Technologies Inc.
Full Time position
Listed on 2026-08-31
Job specializations:
  • Software Development
    Backend Developer, AI Engineer (Applied/Software), Full Stack Developer, AI Reliability/ Performance Engineer
Salary/Wage Range or Industry Benchmark: 70000 - 110000 GBP Yearly GBP 70000.00 110000.00 YEAR
Job Description & How to Apply Below
Location: Greater London

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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