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Principal Machine Learning Engineer (Personalization, Matchmaking, & Player Experience AI) - Publishing Platform

Riot Games · Los Angeles, California, United States

Location
Los Angeles
Job Type
Full-time
Posted
July 08, 2026

Job Description

Responsibilities:


  • Define and lead the modeling architecture for personalization, matchmaking, social graph recommendations, and player/community discovery.

  • ‘Architect multi-model systems combining skill, preference, trust, and safety signals for fair and meaningful matchmaking

  • Develop models for skill inference, player behavior prediction, trust & safety signals, and multi-objective optimization across fairness, latency, and experience quality.

  • Build and optimize real-time inference systems for personalized content, store offers, matchmaking, and player interactions at global scale.

  • Drive adoption of advanced modeling approaches including contextual bandits, reinforcement learning, graph ML, and session-aware personalization.

  • Partner with Data Engineering and Product to shape data schemas, feature pipelines, telemetry standards, and model observability across the ML lifecycle.

  • Define Res...

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