Head of Fraud

As Head of Fraud at Polymarket, the world's largest prediction market, you own fraud risk end to end. You define strategy, build preventative and detective controls, and ensure every finding is resolved. Trust in every account, deposit and trade is core to the product, and you hold the bar for what good looks like both commercially and in the eyes of regulators.

What you'll do

• Own the fraud risk framework and appetite, and set the roadmap to deliver it
• Maintain a living fraud risk assessment and typology library across onboarding, funding, trading and withdrawals
• Report fraud exposure, losses, control performance and emerging threats to senior leadership and governance forums
• Partner with Product and Engineering to assess fraud risk before new products, payment methods, promotions and material feature changes launch
• Define and implement preventative controls including identity and device signals, step-up authentication, velocity and limit rules, and payment and withdrawal checks
• Build detective controls including monitoring rules, ML and AI models, anomaly detection, alerting and case management
• Tune controls continuously against loss rates, false positives and customer friction
• Own investigations from triage to root cause to closure, covering first-party fraud (chargeback and friendly fraud, promotion and referral abuse, ACH fraud, multi-accounting, identity misrepresentation) and third-party fraud (account takeover, synthetic and stolen identities, stolen payment methods, phishing, social engineering, scams, organized fraud rings)
• Make sure every finding from monitoring, audits, regulatory exams and incidents has an owner, a fix and a deadline, and is closed out
• Feed lessons back into product, controls and policy so issues don't recur
• Build and lead a high-performing fraud team of analysts, investigators and fraud data specialists
• Drive delivery through Product and Engineering: shape their roadmaps, win prioritization for fraud work, and design prevention into features from day one
• Work with Compliance and Legal on regulatory expectations, SAR-related escalations and exam readiness
• Select and manage fraud vendors and tooling

What you bring

• Exceptional ability to influence: a track record of getting fraud controls shipped by product and engineering teams you don't manage, building trust fast, making a clear case using data, winning prioritization against competing roadmaps, and turning disagreement into decisions
• 10+ years of experience in fraud within fintech, payments, banking, crypto, trading, online gaming, or other high-volume digital platforms, including at least 5 years in leadership with direct accountability for fraud prevention, investigations, operations and measurable outcomes
• A track record of building preventative and detective controls from scratch and proving they cut losses without hurting good customers
• Hands-on experience with both first-party and third-party fraud, including account takeover, identity fraud and payment fraud
• AI native: you use AI and automation as your default way of working for detection models, investigation tooling, case triage and day-to-day productivity, and you know where models beat rules and where they don't
• Commercial judgement: you understand that the goal is the right balance of loss, friction and growth, not zero fraud, and can put a number on the trade-offs
• Knowledge of what regulators expect from a fraud program (governance, documentation, testing, escalation) and ability to defend your approach in an exam
• Ability to drive outcomes quickly, prioritize ruthlessly and close things out in a fast-moving, high-growth environment
• Comfort working directly in SQL and with data teams to size problems and measure control performance

Nice to have

• Experience at a regulated exchange, derivatives venue, broker, or crypto platform with on-chain and fiat flows
• Familiarity with blockchain analytics and wallet-level risk signals
• Exposure to market abuse and trade surveillance, and how it intersects with fraud
• Experience building fraud capability across multiple jurisdictions
• Hands-on experience shipping LLM or agent-based tooling for investigations

What we offer

• Base salary range of $500,000 to $600,000, plus equity and benefits
• Competitive equity
• Unlimited PTO
• Full health, vision and dental coverage
• 401k match
• Hardware setup: new MacBook Pro, large display and accessories

About Polymarket

Polymarket is the world's largest prediction market, built on blockchain infrastructure for transparent price discovery across events, elections, economics and more.