Site Lead, Data & ML (up to £240k)

Dex; Greater London; On-site; GBP 140,000 - 200,000; Full time

Job summary

Dex is seeking a leadership-level data & ML leader to head its London function from day one. You will define strategy, drive applied ML initiatives across reward optimisation, real-time personalisation and offer ranking, and grow a high-ownership team from one hire to ten within a year while remaining an active technical contributor.

You will review designs and code, participate in model reviews, and translate business priorities into concrete technical plans with measurable impact on company

Qualifications

• Senior individual contributor with leadership chops.
• End-to-end applied ML experience in recommendation/ranking or similar domains.
• Ability to hire, coach and set technical bar for a small high-ownership team.
• Comfort defining solutions in ambiguous environments without playbooks.
• Proven track record delivering business outcomes from technical work.

Responsibilities

• Lead the London data and ML function, defining roadmap and strategy.
• Drive applied ML initiatives in reward optimisation, real-time personalisation, and offer ranking.
• Build and scale a high-ownership team from scratch with strong interview processes.
• Contribute technically through design, code, and model reviews.
• Translate business priorities into technical plans with direct impact.

Skills

Senior IC background

Applied ML

Leadership

Hiring & coaching

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

This is a profitable, bootstrapped platform rewarding 80 million users globally. They're one of Europe's fastest-growing companies, building out their first dedicated data and ML presence in London.

You'll lead that function from day one, growing a team from a single hire to ten over the next year. This isn't a distant management role: you'll stay a genuine technical contributor, reviewing designs and code, joining model reviews, and staying in the problems. The work is applied and commercial: reward optimisation, real-time personalisation, offer ranking. You're building the ground the team will stand on, not just tuning something that already runs.

The work

• Lead the London data and ML function, defining its roadmap and technical strategy.
• Drive applied ML initiatives across reward optimisation, real-time personalisation, and offer ranking.
• Build and scale a high-ownership team from scratch, setting the technical bar and interview process.
• Contribute technically through design reviews, code reviews, and model reviews.
• Translate business priorities into technical plans, ensuring direct impact on company-level outcomes.

What You Bring

• Strong individual contributor background at senior, staff, or principal level; you want to keep building.
• End-to-end ownership of an applied-ML domain: recommendation, ranking, marketplaces, adtech, or similar.
• Clear examples of business outcomes your technical work directly drove.
• Comfort defining solutions in ambiguous environments, rather than following existing playbooks.
• Experience hiring, coaching, and setting the technical bar for a small, high-ownership team.

Why apply through Dex

This is a rare, foundational leadership role in a rapidly scaling, profitable business. Opportunities like this are often oversubscribed or hard to find. Apply through Dex to cut through the noise, get a full brief on the company and role, and skip the cold application process.

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