Applied Scientist, Ranking & Recommendations

ERLPhase Power Technologies Ltd.

. Set the standard for recommender systems at Relay .

Posted 11/9/2026full-timeLondon • United KingdomMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in building and leading recommender systems at scale, integrating reinforcement learning and large language models (LLMs) to optimize decision-making processes. Strong collaboration and communication skills are essential for explaining complex concepts and fostering a research-driven culture.

Highest-signal resume keywords

Recommender Systems DevelopmentReinforcement LearningLarge Language Models (LLMs)Data-Driven Decision MakingCollaboration and Communication

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Recommender SystemsLarge-Scale OptimisationModel DevelopmentExperimental DesignData Analysis

Soft Skills

CollaborationComplex Idea ExplanationEntrepreneurial Drive

Industry Keywords

Operational ResearchPersonalisationEconomicsCourier PreferencesPhysical-Network Constraints

About the role

Key responsibilities & impact

Set the standard for recommender systems at Relay
Lead the evolution of Relay's recommender from research to production
Design and build recommender systems that power Relay's key decisions
Partner with Operational Research to unite recommender models and optimisation
Contribute to Relay's research culture and develop Relay's voice in the tech community
Build recommender systems for matching thousands of couriers to available routes
Develop models powering large-scale optimisation of courier preferences and physical-network constraints
Integrate economics, personalisation, and optimisation in recommendations
Use data from Relay's apps to inform recommendation systems

Requirements

What you’ll need

Have built recommender systems at scale, owned them in production, and led their direction
Bring deep expertise in recommender systems, reinforcement learning and LLMs, whether from a PhD, publications, or years at the frontier in industry
Think in experiments, and let evidence guide decisions
Are energised by open-ended problems, and know how to make them tractable
Collaborate generously, and explain complex ideas simply
Strong technical fundamentals and entrepreneurial drive
Must address UK visa sponsorship needs in the application form

Benefits

Comp & perks

Equal-opportunity employer committed to diversity, inclusion, and fostering a workplace where everyone thrives