Machine Learning Engineer III - Unpublished R&D; Product (Reinforcement Learning)

Company

Riot Games develops player-focused games and interactive experiences.

What you will do

• Own the strategy, design, implementation, and maintenance of ML capabilities for an unpublished R&D game project.
• Collaborate with developers, designers, data scientists, and analytics partners to identify opportunities and define model and feature strategies.
• Build reusable training and evaluation pipelines and establish architecture patterns for broader use.
• Apply reinforcement learning and other ML systems to improve decision-making and adaptation.
• Establish research-to-production practices, reliability standards, experiment design, and technical evaluation standards.
• Mentor engineers and partner disciplines through documentation, reviews, technical guidance, and pragmatic risk management.

Requirements

• 6+ years of experience delivering ML systems in production, including 3+ years in applied modeling or ML research roles.
• Production experience with reinforcement learning, interacting models, feedback loops, or systems whose behavior has downstream consequences.
• Proficiency with Python or similar programming languages and modern ML or data science frameworks such as PyTorch, TensorFlow, and pandas.
• Experience collaborating across multiple disciplines and communicating with technical and non-technical audiences.
• B.S. in Computer Science or equivalent experience.

Nice to have

• Experience with multi-agent reinforcement learning, developer tooling, or framework-level UI systems.
• Experience with infrastructure and MLOps, including ML cloud services, containers, and model telemetry.
• Experience working with AAA game engines such as Unity or Unreal.
• Proficiency in C++.

Culture & Benefits

• Player-focused decision-making and emphasis on player empathy.
• Collaborative environment with opportunities to bring different perspectives.
• Open paid time off policy and flexible work schedules.
• Medical, dental, and life insurance.
• Parental leave and a 401k with company match.