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Principal Machine Learning Engineer

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Principal Machine Learning Engineer in USA

  • Riot Games
  • Full time
  • Email
  • Los Angeles, CA

Responsibilities

  • Lead AI/ML workflows, MLOps, automation, self-healing pipelines, and deployment standards for League of Legends.
  • Design and implement scalable AI/ML serving architecture and integrations for Riot’s global player base.
  • Lead ML feature platforms and data-pipeline improvements addressing scale, latency, and reliability constraints.
  • Drive ML developer experience, platform tooling strategy, API standards, and operational cost optimization.
  • Establish AI/ML governance, compliance, privacy, security, and cryptography practices with partner teams.
  • Set incident management, response, observability, and monitoring standards for production ML systems.
  • Mentor senior and staff-level engineers, coach developers across disciplines, and contribute to recruiting standards and interview kits.

Requirements

  • Bachelor’s degree in Computer Science or a related field, or equivalent practical experience.
  • 10+ years of professional software engineering experience, including 5+ years building production ML platforms, systems, or MLOps capabilities.
  • Evidence of leading platforms or systems adopted and relied upon by multiple teams or products.
  • Deep operational experience with ML-system failure modes such as training-serving skew, silent degradation, and cost spirals.
  • Experience with cloud-native orchestration, Kubernetes, GPU scheduling, container orchestration, and large-scale system design.
  • History of improving ML practitioner developer experience and materially increasing shipping speed or reliability.
  • Track record mentoring senior and staff-level engineers and elevating platform engineering judgment.
  • Experience serving multiple products or game titles, solving novel ML data-pipeline constraints, or working in ML governance, security, privacy, or compliance is preferred.
  • Interest in player experience, games, or creative technology.

Benefits

  • Los Angeles headquarters-based role with flexible work schedules.
  • Open paid time off policy.
  • Medical, dental, vision, and life insurance.
  • Short- and long-term disability coverage.
  • Parental leave for employees, spouses or domestic partners, and children.
  • 401(k) with company match.
  • Incentive compensation and equity are offered in addition to base salary.

Salary: $292k - $438k/yr

Riot Games

Since 2006, Riot Games has stayed committed to changing the way video games are developed, published, and supported for players. From our first title, League of Legends, to 2020’s VALORANT; we have strived to evolve the community with growth in Esports, and expansion from games into entertainment...

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