Senior Investigation Analyst

Polymarket is looking for a Senior Investigation Analyst to help protect the integrity of its markets. Market Integrity's remit covers insider trading, market manipulation, spoofing and order-book abuse, coordinated multi-account activity, bot and automated-trading abuse, sanctions and illicit-finance exposure, and account takeover and fraud.

You'll own investigations end to end and serve as a point of contact for law enforcement and regulatory inquiries into suspicious activity - using on-chain analysis, vendor surveillance tools, and referrals from across the company to build cases from initial signal through documented, defensible findings.

- Investigate insider trading, coordinated wallet activity, spoofing, and other market integrity matters from initial signal through a documented, defensible finding

- Trace wallets, funding flows, and transaction history using tools such as Chainalysis to identify coordination and test hypotheses

- Review spoofing, layering, and related order-book manipulation using trade-surveillance tooling (e.g., Eventus/Validus) alongside on-chain evidence

- Evaluate and respond to subpoenas and legal process, assessing risk and sensitivity and meeting binding deadlines

- Write investigative reports and findings that hold up to scrutiny from leadership, law enforcement, or outside counsel

- Stay current on manipulation and fraud patterns as prediction markets and the underlying blockchain ecosystem evolve

- 5-7+ years of investigative experience in trade surveillance, market structure or regulation, blockchain forensics, financial crimes, law enforcement, or a comparable field involving building cases from ambiguous evidence

- Working knowledge of order-book mechanics and manipulation typologies (spoofing, layering, wash trading), or blockchain analysis and on-chain typologies - ideally both

- Direct experience with blockchain analysis tools (e.g., Chainalysis, TRM Labs, Elliptic) or trade-surveillance platforms (e.g., Eventus/Validus, Nasdaq SMARTS)

- A track record of building a case from limited initial indicators and documenting it clearly enough to act on

- Sound judgment evaluating and responding to legal and regulatory requests under real deadlines

- Genuine comfort with ambiguity - a meaningful share of what you'll investigate won't map to a category that already exists

- (Plus) Experience with prediction markets or other crypto-native platforms

- (Plus) SQL or Python, used to test your own hypotheses against trade or on-chain data

- (Plus) Prior experience serving as a point of contact for law enforcement or regulators

- Hardware setup: new MacBook Pro, big display, & accessories