AI Engineer (up to £300k)

Dex; Greater London; On-site; GBP 100,000 - 180,000; Full time

Job summary

Dex in London is seeking an elite AI engineer to own the development of our AI agent and its evaluation pipelines. You will refine the harness, tools, and context optimization, while driving SFT and RL initiatives. The role demands hands-on execution and strong ownership, with close collaboration to shape core AI features.

You will join a lean engineering team in Hoxton and grow into technical leadership, delivering high-impact parts of our roadmap with relentless focus on quality.

Qualifications

• Demonstrable evidence of being a top-centile engineer.
• Hands-on experience building your own AI agents, utilizing MCP, skills, and hooks.
• Exceptional drive and ownership to deliver complex projects.
• Willingness to work in-person 5 days a week in London.

Responsibilities

• Ship high-quality code at speed, leveraging the latest AI tools and models.
• Enhance the AI agent by refining its harness, tools, and context optimization.
• Own the full lifecycle of evaluation pipelines, data collection, SFT, and RL.
• Collaborate with design to ensure intuitive, polished features.
• Grow into a technical leader, taking ownership of significant AI roadmap parts.

Skills

Top engineer

Hands-on AI agent

MCP

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.