Founding AI Engineer: Ship Production LLM Agents (Hybrid)

Upsolve Labs UK Limited.; City of London; Hybrid; GBP 100,000 - 140,000; Full time

Job summary

A dynamic AI startup in London is seeking a founding AI engineer to design and ship real-world LLM solutions. This high-impact role requires over 7 years of engineering experience and a strong command of AI tooling. You will lead experiments and set product direction while working in a team-focused, flexible environment. The position offers a competitive salary of £100k–140k along with equity options and the chance to innovate in a cutting-edge field.

Benefits

Competitive salary

Equity options

Flexible work policy

Take-what-you-need holiday policy

Qualifications

• 7+ years of engineering experience including shipping production LLM systems.
• Experience in complex, real-world environments.
• Strong product mindset with decision-making ability in a startup environment.

Responsibilities

• Design and deploy LLM systems into production.
• Run experiments to drive product direction.
• Build pipelines for quality and reliability of agents.

Skills

Production LLM systems

Multi-step reasoning systems

AI/LLM tooling

Engineering ability (TypeScript)

Database systems

Tools

LangChain

Mastra

DSPy

Job description

A dynamic AI startup in London is seeking a founding AI engineer to design and ship real-world LLM solutions. This high-impact role requires over 7 years of engineering experience and a strong command of AI tooling. You will lead experiments and set product direction while working in a team-focused, flexible environment. The position offers a competitive salary of £100k–140k along with equity options and the chance to innovate in a cutting-edge field.