Product Data Scientist - Recommendation Systems

Harnham; Brighton; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

Harnham in partnership with a leading online marketplace in Brighton is hiring a Product/Decision Scientist to join a cross-functional squad, owning data from idea to delivery and shaping AI-powered customer experiences.

This role blends Data Science, Product and Commercial impact with hybrid work (3 days in office). Strong SQL and Python, plus practical LLM/AI experience, are essential to lead experimentation and present data-driven recommendations.

Qualifications

• 6+ years of experience in Data Science/Decision Science.
• Strong SQL and Python.
• Experience with practical LLM/AI applications.
• Strong experimentation and A/B testing experience.
• Excellent stakeholder management and commercial thinking.
• Experience working closely with Product and Engineering teams.

Responsibilities

• Partner with Product and Engineering to solve commercial and customer problems.
• Lead experimentation, opportunity sizing and product performance analysis.
• Build recommendation models, segmentation solutions and AI-powered product features.
• Develop lightweight data products, automation and proof-of-concepts.
• Apply ML and LLMs to improve customer experiences and internal workflows.
• Present clear, data-driven recommendations to senior stakeholders.

Skills

SQL

Python

LLM/AI applications

Experimentation

Stakeholder management

Product & Engineering collaboration

Job description

Want to own product decisions rather than just analyse them?

Interested in building AI-powered customer experiences from idea to production?

Looking for a role where Data Science, Product and Commercial impact genuinely come together?

Brighton | Hybrid (3 days in office) | Up to £90K

I'm partnering with one of the world's leading online marketplaces, currently investing heavily in Data & AI as they transform into a truly product-led organisation.

They're hiring a Product/Decision Scientist to join one of six cross‑functional product squads, working alongside Product Managers, Engineers and Designers to build customer‑facing features, influence commercial decisions and develop AI‑powered experiences.

Rather than sitting in a central analytics function, you'll own data within your squad, helping shape roadmap decisions from idea through to delivery and measuring the impact of what gets built.

Responsibilities

• Partner with Product and Engineering to solve commercial and customer problems.
• Lead experimentation, opportunity sizing and product performance analysis.
• Build recommendation models, segmentation solutions and AI‑powered product features.
• Develop lightweight data products, automation and proof‑of‑concepts.
• Apply ML and LLMs to improve customer experiences and internal workflows.
• Present clear, data‑driven recommendations to senior stakeholders.

Requirements

• 6+ years' experience in Data Science/Decision Science
• Strong SQL and Python.
• Experience with practical LLM/AI applications.
• Strong experimentation and A/B testing experience.
• Excellent stakeholder management and commercial thinking.
• Experience working closely with Product and Engineering teams.

If you're looking for a role with genuine product ownership, modern technology and the opportunity to influence AI strategy within a growing data organisation, I'd be happy to tell you more.