Head of Fraud

ABOUT THE ROLE

Polymarket is the world's largest prediction market, and trust in every account, deposit and trade is core to the product. As Head of Fraud, you will own Polymarket's fraud risk end to end: defining the strategy, building preventative and detective controls, and making sure every finding is resolved.

Your scope covers first-party fraud (customers abusing the platform themselves) and third-party fraud (bad actors targeting our users and systems, including account takeover). You will hold the bar for what good looks like both commercially and in the eyes of our regulators, and you will move fast.

You will partner with and influence Product owners and engineers you don't manage build and ship most fraud controls, so influencing them is critical to success in this role. You'll also work closely with Compliance, Legal, Data, Payments, Customer Support and Security.

WHAT YOU'LL OWN

Strategy and risk ownership

- 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.

Preventative and detective controls

- Partner with Product and Engineering to assess fraud risk before new products, payment methods, promotions, and material feature changes launch.

- Define and implement controls that stop fraud before it happens: identity and device signals, step-up authentication, velocity and limit rules, and payment and withdrawal checks.

- Build detective controls that surface fraud fast: monitoring rules, ML and AI models, anomaly detection, alerting and case management.

- Tune controls continuously against loss rates, false positives and customer friction.

Fraud types in scope

- First-party fraud: chargeback and friendly fraud, promotion and referral abuse, ACH fraud, multi-accounting, and...