Staff Applied AI/ML Scientist

Who you are

• Bachelor’s degree or higher in Computer Science, Machine Learning, Statistics, or a related quantitative field, or equivalent practical experience
• 6+ years of experience delivering ML systems in production, including 3+ years in applied modeling or ML research roles
• Deep understanding of traditional machine learning models, and production deployment experience in at least one domain: computer vision, graph neural networks, transformer architectures, or agentic systems
• Excellent written and verbal communication with both technical and nontechnical stakeholders
• Demonstrated history of quickly delivering impactful machine learning solutions for critical business problems
• Product owner's mindset, to be able to identify opportunities for impact and then see them through to production
• Track record mentoring engineers across roles and levels; evidence of raising the bar for people around you
• Experience working in adversarial detection (e.g. information/cyber security, fraud, money laundering, cheating, etc)
• Familiarity with relational databases (e.g., MySQL, Postgres), document stores (e.g., ElasticSearch), and distributed storage systems (e.g., HDFS, S3, Google Cloud Storage)
• Experience defining telemetry or instrumentation needs in close partnership with software or data engineers
• Working understanding of Windows internal mechanics (e.g. processor memory, driver architecture, etc.) and how adversarial software can leverage them to bypass security controls
• Understanding of high-performance competitive multiplayer games and the challenges associated with them
• For this role, you'll find success through craft expertise, a collaborative spirit, and decision-making that prioritizes the delight of players. We will be looking at your past studies, experience, and your personal relationship with games. If you embody player empathy and care about players' experiences, this could be your role!

What the job involves

• Anti-Cheat is Riot’s first defense against cheaters that don’t want to play fair
• As a cross-discipline team of former cheaters, kernel developers, machine learning engineers, data analysts, and software engineers, they make products like Vanguard to detect and ban the bad guys across all of Riot’s competitive titles and platforms, staying vigilant to whatever shape they’ll take in response
• From beaming bots to scorching scripters, anti-cheat enables Riot’s game teams to take on competitive genres and design rewarding systems that would otherwise be too vulnerable to fraudsters and cheaters
• Riot Machine Learning Engineers on Anti-Cheat are builders, trailblazers, and stewards of competitive integrity
• We protect the legitimacy of Riot’s multiplayer games and player experience by building automated detection and decisioning systems to address a wide range of anticompetitive threats
• As a Staff Applied AI/ML Scientist on Anti-Cheat, you will build machine learning driven detection systems to identify players engaging in cheating and other forms of abuse, and will develop agentic systems for reviewing and and actioning these players
• You will partner with anti-cheat experts as well as game product, engineering, and insights teams to ensure that all Riot games afford safe, fair environments for players to compete and thrive
• You will report to the Senior Manager of Anti-Cheat Data and Analytics
• Design, train, and deploy real-time machine learning models to detect gameplay anomalies, automated bots, and memory-tampering exploits
• Build scalable inference pipelines capable of evaluating millions of high-throughput game actions per second with minimal latency impact
• Partner with anti-cheat software engineers to identify emerging cheat techniques and engineer high-signal features from raw game client telemetry
• Establish robust ML Ops practices, including automated model retrain loops and continuous monitoring for adversarial drift
• Analyze complex, high-dimensional player data to minimize false positives and maintain a fair, competitive environment for players globally
• Work directly with game design and gameplay engineering teams to balance strict anti-cheat enforcement with smooth, responsive, and uninterrupted player experiences
• Collaborate with the data engineering team to troubleshoot and optimize ETL pipelines, ensuring efficient data flow and processing
• Help set technical direction within Anti-Cheat ML in an ever-evolving anti-cheat landscape

Benefits

• Healthcare: Medical, dental, and vision plans that cover you as well as your spouse/domestic partner and children.
• Family Care: Life insurance, parental leave, plus short and long-term disability.
• Open Paid Time Off: In addition to holidays, a 2-week end of year break, and a 1-week mid-year break, Rioters are trusted to take the time they need throughout the year.
• Retirement: Riot matches retirement contributions so you can continue to play games long after you retire.
• Play Fund: Riot’s annual play fund allows Rioters to broaden their knowledge of the games that matter to players and the community.
• Donation Matching: Riot matches donations of time and money to nonprofits to double down on support.