AI Engineer (up to £300k)

Dex; Greater London; On-site; GBP 90,000 - 140,000; Full time

Job summary

Dex partner company in London is seeking an exceptional AI engineer to join a lean team focused on making an AI agent smarter. You will own evaluation pipelines, data collection, Supervised Fine-Tuning (SFT), and Reinforcement Learning (RL), with a clear path to technical leadership.

This in-person role is five days a week at the Hoxton, London office. You will ship high-quality code, refine the harness and context for the agent, and collaborate with design to deliver polished features on an

Qualifications

• Top-centile engineering capability and proven track record.
• Hands-on experience building AI agents.
• Strong drive to own complex projects.
• Willing to work in the London Hoxton office 5 days a week.

Responsibilities

• Ship high-quality code using the latest AI tools and models.
• Refine the AI agent's harness, tools, and context optimization.
• Own evaluation pipelines, data collection, SFT, and RL.
• Collaborate with design to ensure intuitive features.
• Grow into a technical leader with ownership of AI roadmap.

Skills

AI engineering

AI agents

Leadership potential

In-person collaboration

Tools

MCP

Hooks

Job description

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process.

The role

Businesses make their biggest decisions on broken tools. We're fixing that, starting with financial modeling – the worst-tooled form of programming. Our AI add-in for Excel is just the beginning; the long-term vision is an AI operating system for the entire strategic decision lifecycle, a $100bn+ opportunity. We're a small, formidable engineering team, with backgrounds from top-tier institutions.

This isn't a 'vibe coding' role. You'll join a lean team, focused on making our core AI agent smarter. That means improving its harness, tools, and context optimization. You'll own evaluation pipelines, data collection, SFT, and RL, with a clear path to technical leadership. Expect high ownership, deep technical problems, and a 5-day-a-week commitment in our London office.

The work

• Ship high-quality code at speed, leveraging the latest AI tools and models. AI isn't optional here.
• Enhance our AI agent's intelligence by refining its harness, tools, and context optimization.
• Own the full lifecycle of evaluation pipelines, data collection, Supervised Fine-Tuning (SFT), and Reinforcement Learning (RL).
• Collaborate closely with design to ensure every feature is intuitive and polished.
• Grow into a technical leader, taking ownership of significant parts of our AI roadmap.

What You Bring

• Demonstrable evidence of being a top-centile engineer. No compromises.
• Hands-on experience building your own AI agents, utilizing concepts like MCP, skills, and hooks.
• Exceptional agency and determination to drive complex projects to completion.
• Ability to work 5 days a week, in person, from our Hoxton, London office.