Senior Data Scientist, Personalisation & Recommender

Relay Technologies; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Job summary

Relay Technologies in London is seeking a Senior Data Scientist to design and scale recommender systems that power our logistics platform and optimize how thousands of couriers are matched to routes.

You will bridge research and production, collaborating with operations research and data teams, applying reinforcement learning and LLMs to balance efficiency, cost, and user experience while owning end-to-end model development.

Qualifications

• Built recommender systems at scale and in production.
• Deep expertise in recommender systems, reinforcement learning and LLMs.
• Experience designing experiments to guide decisions.
• Comfort tackling open-ended problems with tractable approaches.
• Strong ability to collaborate and explain complex ideas clearly.

Responsibilities

• Set the standard for Relay's recommender systems.
• Lead the evolution of Relay’s recommender from research to production.
• Design and build the recommender systems powering Relay’s key decisions.
• Partner with Operational Research to unite models and optimisation.
• Contribute to Relay’s research culture and the tech community voice.

Skills

Recommender systems

Reinforcement learning

LLMs

Experimentation

Production engineering

Collaboration

Job description

Relay Technologies in London is seeking a Senior Data Scientist to design and scale recommender systems that power our logistics platform and optimize how thousands of couriers are matched to routes.

You will bridge research and production, collaborating with operations research and data teams, applying reinforcement learning and LLMs to balance efficiency, cost, and user experience while owning end-to-end model development.