Senior Backend Engineer, Trust & Safety

About Polymarket

Polymarket is the world's largest prediction market platform. We enable individuals to express views on real-world events by trading on outcomes across politics, economics, sports, culture, and current affairs. Built as a peer-to-peer marketplace with no centralized “house,” Polymarket aggregates diverse opinions into transparent, market-based probabilities that reflect collective expectations about the future. We’re growing fast: both in volume ($21B traded in 2025) and in adoption as an alternative news source. Our ambition is to become a ubiquitous beacon of truth in global media, powered by fast, reliable, and deeply technical market infrastructure.

Responsibilities

• Build detection and monitoring tooling: Design and build detection, monitoring, and case-management systems to meet AML/BSA, KYC/EDD, and sanctions-screening obligations at scale.
• Integrate surveillance platforms: Build on or integrate with trade-surveillance and case-management platforms (e.g., Eventus, Palantir) and structure audit-grade data pipelines (tiered storage, long-term retention in S3) for compliance and financial-crimes review.
• Reconcile financial data: Model and reconcile financial data (FinOps, ledger reconciliation) to ensure auditability and accuracy of money-movement records.
• Partner with Compliance and Risk: Translate regulatory requirements into engineering systems — alerting, case queues, investigative reporting — in close partnership with Compliance, Risk, and Legal.
• Build real-time risk systems: Develop real-time risk decisioning and transaction-monitoring systems to detect and respond to financial crime.
• Collaborate cross-functionally: Work closely with engineers across the platform to keep Trust & Safety systems tightly integrated with the broader exchange.

Requirements

• Backend engineering experience building detection, monitoring, or case-management tooling for AML/BSA, KYC/EDD, or sanctions-screening obligations at scale.
• Experience integrating or building on trade-surveillance and case-management platforms (e.g., Eventus, Palantir) and structuring audit-grade data pipelines.
• Comfortable modeling and reconciling financial data (FinOps, ledger reconciliation) for auditability and accuracy.
• Track record partnering directly with Compliance, Risk, and Legal teams to translate regulatory requirements into engineering systems.
• Background in risk/fraud or compliance-technology engineering at a fintech or crypto exchange (e.g., Coinbase Risk Engineering, Robinhood Financial Crimes).
• Experience building real-time risk decisioning or transaction-monitoring systems at scale (preferred).

Benefits

• Competitive salary & equity
• Unlimited PTO
• Full Health, Vision, & Dental coverage
• 401k match
• Hardware setup — new MacBook Pro, big display, & accessories