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. As a Staff Applied AI/ML Scientist on Anti-Cheat, you will lead modeling strategy across the team's portfolio of competitive integrity products. This includes establishing architecture, setting standards, and ultimately building the weaponry that enables Riot to stay one step ahead of cheaters and botters. The work will be high-complexity, with tangible antagonists seeking to iteratively understand the boundaries of any classifiers, almost as quick as they are deployed, and your work will directly serve players of the highest devotion by identifying these actors in all of their many environments, ensuring that the time it takes to earn rank in Riot’s competitive queues is time well-spent. You will report to the Senior Manager of Anti-Cheat Data and Analytics.

Responsibilities

Use all of Anti-Cheat’s resources to help design, build, and maintain AI/ML pipelines from end-to-end, creating an iterative, ever-evolving series of classifiers, capable of adapting in perpetuity as attackers learn from its actions.
Innovate in the anomaly detection space by creating proven, trusted player outcomes from novel and even theoretical modelling approaches.
Leverage Riot’s centralized ML infrastructure where possible, upgrade it where necessary, and ensure that any realized technical capabilities can be capitalized on by other teams and products.
Independently analyze and develop prototypes for emerging challenges in the anti-cheat space, including challenges of cost efficacy.
Refine modeling and feature invention strategy across projects; improve architecture trade-offs, signal extraction techniques, and quality standards for complex data sources.
Develop mission-critical machine learning and artificial intelligence systems from scratch, including gathering requirements and designing scalable, production-ready architecture that significantly impacts the team and product.
Reduce ambiguity in complex problem spaces by leading technical discovery and prototyping efforts that have a strategic impact on the team.
Establish recruiting practices across multiple teams; serve as a trusted interviewer for related roles.
Mentor junior staff by sharing your reasoning behind design decisions and result interpretations.

Required Qualifications

Ph.D. in Machine Learning, AI, Statistics, Math, or related Computer Science/Quantitative field with 3+ years of industry experience (including Postdoc), or equivalent experience (i.e., M.S. with 4-6+ years of relevant experience, or B.S. with 6-8+ years of relevant experience).
2+ years of experience working directly in anti-cheat, anti-fraud, or anti-virus spaces.
Working knowledge of production ML systems to engage credibly on model serving, CI/CD for ML, observability, and cost tradeoffs, and write the code daily.
History of working at the boundary between research and production, where interesting problems require both scientific rigor and engineering pragmatism.
Experience establishing evaluation practices across AI/ML projects in partnership with product data scientists; guide experiment design for measuring model impact and set technical evaluation standards.
Deep understanding of traditional machine learning models, with familiarity in deep learning technologies and their applications.
History of working with complex or unconventional data sources where off-the-shelf feature engineering doesn’t apply.
Comfort representing ML capabilities in cross-disciplinary forums and translating technical tradeoffs for product, design, and leadership audiences.

Desired Qualifications

Experience building iterative machine classifiers for behavioral anomalies in competitive video games.
Hands-on experience in threat detection and classification for risk, fraud, insurance, security, sports, or gaming spaces.
Experience bridging research and production, like translating papers or prototypes into reliable shipped systems.
Passion for player experience, games, or creative technology.

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!

Our Perks:

Riot focuses on work/life balance, shown by our open paid time off policy and other perks such as flexible work schedules. We offer medical, dental, and life insurance, parental leave for you, your spouse/domestic partner, and children, and a 401k with company match. Check out our benefits pages for more information.

At Riot Games, we put players first. That mission drives every decision in our quest to create games and experiences that make it better to be a player. Whether you’re working directly on a new player-facing experience or you’re supporting the company as a whole, everyone at Riot is part of our mission. And just like in our games, we’re better when we work together. Our goal is to create collaborative teams where you are empowered to bring your unique perspective everyday. If that sounds like the kind of place you want to work, we’re looking forward to your application.

It’s our policy to provide equal employment opportunity for all applicants and members of Riot Games, Inc. Riot Games makes reasonable accommodations for handicapped and disabled Rioters and does not unlawfully discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, handicap, veteran status, marital status, criminal history, or any other category protected by applicable federal and state law. We consider for employment all qualified applicants, including those with criminal histories, in a manner consistent with applicable federal, state and local law, including the California Fair Chance Act, the City of Los Angeles Fair Chance Initiative for Hiring Ordinance, the Los Angeles County Fair Chance Ordinance for Employers, the San Francisco Fair Chance Ordinance, and the Washington Fair Chance Act.

Per the Los Angeles County Fair Chance Ordinance, the following core duties may create a basis for disqualifying candidates with relevant criminal histories:

Safeguarding confidential and sensitive Company data
Communication with others, including Rioters and third parties such as vendors, and/or players, including minors
Accessing Company assets, secure digital systems, and networks
Ensuring a safe interactive environment for players and other Rioters

These duties are directly related to essential operations, safety, trust, and compliance obligations within our organization. Please note that job duties may evolve based on business needs and additional responsibilities may be assigned as necessary to maintain operational efficiency and security.