Senior Payment Risk Analyst

About the role

You will own the risk posture for all money movement on Polymarket, investigating live payment fraud cases across deposits, withdrawals, and settlement payouts while making timely decisions on holds, reversals, and account actions. You will monitor transaction data for anomalies tied to high-volume market events, distinguishing normal volume spikes from genuine abuse signals and adjusting oversight accordingly. This role requires you to write and tune fraud detection rules in response to emerging patterns, using transaction data to set thresholds you can defend quantitatively to stakeholders and regulators. You will identify control gaps across the full payment stack and work directly with Engineering, Compliance, and InfoSec to close them, ensuring risk controls keep pace with product and volume changes. You will own relationships with payment processors, card networks, and banking partners on risk-related matters, including chargeback disputes, ratio management, and compliance inquiries that impact our ability to transact. The position involves producing clear, well-reasoned risk memos and committee-level reporting that translate payment risk findings into decisions for non-risk stakeholders who rely on your analysis. You will maintain and improve the team's core fraud and payment risk documentation, including policies, runbooks, and week-over-week metric tracking to support continuous improvement. This role operates at the intersection of fraud operations, payment rail mechanics, and regulatory compliance within the US Exchange function.

Key facts

What you'll do

• Investigate live payment fraud cases across deposits, withdrawals, and settlement payouts, making timely decisions on holds, reversals, and account actions.
• Monitor transaction data for anomalies tied to high-volume market events, distinguishing normal volume spikes from genuine abuse signals.
• Write and tune fraud detection rules in response to emerging patterns, using transaction data to set thresholds you can defend quantitatively.
• Identify control gaps across the full payment stack, then work directly with Engineering, Compliance and InfoSec to get those gaps closed.
• Own relationships with payment processors, card networks, and banking partners on risk-related matters, including chargeback disputes, ratio management, and compliance inquiries.
• Produce clear, well-reasoned risk memos and committee-level reporting that translate payment risk findings into decisions for non-risk stakeholders.
• Maintain and improve the team's core fraud and payment risk documentation, including policies, runbooks, and week-over-week metric tracking.
• Analyze payment rail performance and risk trends to support data-driven adjustments to monitoring and controls.
• Collaborate with Compliance and Legal to ensure payment practices align with regulatory expectations and internal policies.
• Partner with Engineering to design and test new controls that reduce false positives while improving detection accuracy.
• Coordinate with InfoSec to assess and remediate vulnerabilities in payment flows and related systems.
• Interpret CFTC and other regulatory guidance to inform payment risk policies and procedures.
• Track and report on key risk metrics to surface trends and inform leadership decisions.
• Support ad hoc analyses related to new product launches or changes to existing market flows that affect payment risk.

Requirements

• 8 or more years of hands-on experience in payments risk, fraud risk, or transaction monitoring at a fintech, exchange, payments company, bank, or comparable regulated financial services business.
• Direct experience with ACH, wire, card networks (Visa and Mastercard), and at least one real-time payment rail (RTP or FedNow), including their dispute mechanics, chargeback rules, and associated fraud patterns.
• Working knowledge of BSA/AML fundamentals and how payments risk and AML risk overlap, including SAR filing, structuring detection, and transaction monitoring systems.
• Demonstrated experience setting quantitative risk thresholds, such as velocity limits and chargeback ratios, and defending those decisions to internal stakeholders, processors, banks, and card networks.
• Strong written communication skills. This role produces risk memos and reporting for senior stakeholders on a regular basis. You need to write clearly and argue a position well.
• Experience auditing a payment stack end to end, identifying where controls are missing or miscalibrated, and building the case for what needs to change.
• (Plus) Familiarity with CFTC-regulated environments or other derivatives/exchange contexts.
• (Plus) Experience working in a high-growth environment where payment volumes scale quickly and the risk surface changes fast.
• (Plus) Exposure to crypto or blockchain-adjacent payment flows.

Practical notes

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