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Founding Engineer

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Understanding Recruitment
Full Time position
Listed on 2026-02-28
Job specializations:
  • IT/Tech
    AI Engineer, Systems Engineer
Salary/Wage Range or Industry Benchmark: 60000 - 80000 GBP Yearly GBP 60000.00 80000.00 YEAR
Job Description & How to Apply Below
Location: Greater London

Do you have experience working at an early-stage startup and want to do it again, properly this time?

Are you excited by real ownership, commercial impact, and building something genuinely category-defining?

🧠
Experience: 3-8 years (startup / founding engineer background preferred)

We’re partnered with a pre-seed AI startup building agentic AI systems that radically improve how knowledge workers think, decide, and get work done. This is not another chatbot. This is an AI-native product being built from first principles by engineers from elite technical environments (e.g. Palantir, Citadel).

They’re now looking for a Founding Engineer, someone who’s either:

  • Already been a founding / early engineer or
  • Worked in a fast-moving, high-growth startup and understands what it takes to ship real product, fast, with users in mind

You’ll work directly on:

  • Core agent loops (prompting, tool selection, model choice, memory & context)
  • High-performance, real-time LLM-powered UX
  • Making autonomous systems reliable enough for daily, mission-critical work

As a Founding Engineer, you’ll wear many hats:

  • Frontend: Type Script, React
  • AI/LLMs everywhere (Cursor/Copilot as a daily workflow)
  • Product thinking & UX judgment
  • Talking to users and rapidly iterating
  • Full SDLC ownership
    ; build, ship, break, fix, repeat

What they’re looking for:

  • Strong commercial & product mindset – you care about outcomes, not just code
  • Comfortable in ambiguity and zero-to-one environments
  • Proven ability to ship fast in small teams
  • AI-native way of working (LLMs are tools, not toys)
  • Resilient, adaptable, and genuinely excited by hard problems
  • Real ownership — technical and product
  • Small, elite team that ships fast
  • Well-funded with long runway
  • You’ll help define a product shaping the next generation of software
  • Not another boring B2B Saas… this is something you’d actually use

If you’re ready to step into a true founding-level role, influence the product direction, and build something genuinely new, this is the one. Interested? Apply now! 🚀

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