Founding AI Engineer (LLM System, Agent & Decision Intelligence)

Founding AI Engineer (LLM Systems, Agents & Decision Intelligence)

£100,000-130,000 Depending on Experience + Equity

London

MBN Solutions are partnering with a start up AI platform that specialises in Synthetic Human behaviour.

We are hiring a Founding AI Engineer to help build AI systems that let companies test decisions before they happen.

We're building a decision platform that helps businesses understand how customers, markets, and competitors may respond before a pricing change, product launch, or growth initiative goes live.

Today, many critical business decisions are still tested directly in the real world. We believe there should be a safer environment to explore those decisions first.

As a Founding AI Engineer, you'll work on the intelligence layer behind that vision:

• Build production-grade LLM and agentic workflows

• Design evaluation, tracing, replay, and quality-control systems

• Turn messy business data into reliable reasoning contexts

• Improve AI reliability through structured outputs, retrieval, calibration, and testing

• Develop systems that expose assumptions, uncertainty, and evidence

• Help define what trustworthy AI predictions look like

We're looking for someone with:

✓ 5+ years of engineering experience

✓ Strong Python and production systems expertise

✓ Hands-on experience with LLMs, agents, RAG, or AI workflow systems

✓ Experience building evaluation frameworks, tests, or quality gates for AI systems

✓ Strong product instincts and comfort working in ambiguity

This isn't a prompt-engineering role, and it isn't pure research. You'll be building real systems that help customers make better decisions and continuously improve by learning from real-world outcomes.

If you're excited by AI systems that are auditable, measurable, and tested against reality, we'd love to hear from you.

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