Fraud Data Scientist

The role

You will analyze fraud model and rule performance across card, bank, and alternative payment rails. You will identify fraud trends, recommend new features, and design experiments to improve decision strategies.

What you will do

• Track how fraud models and rules perform over time and by merchant segment.
• Spot emerging fraud patterns like fraud rings, account takeover, card testing, friendly fraud, and bonus abuse.
• Explore transaction, device, behavioral, identity, and network data to find new signals.
• Prototype and validate features for engineering.
• Manage label quality and feedback loops from chargebacks, disputes, and manual review.
• Design and analyze backtests, shadow tests, and champion/challenger experiments.
• Evaluate third-party fraud vendors against internal models.
• Partner with risk operations to tune thresholds, rules, and step-up authentication.
• Recommend decision strategies per merchant segment.
• Create reporting for leadership, merchants, banks, and auditors regarding model decisions and performance.

Required qualifications

• 4+ years as a data scientist or analyst working on fraud, risk, or abuse
• Used analysis to measurably improve production fraud models or rules
• Strong SQL and Python
• Fluent with the stats and ML concepts behind fraud models (gradient-boosted trees, calibration, imbalanced data)
• Solid grasp of the fraud problem space: card-not-present fraud, account takeover, card testing, friendly fraud, chargeback reason codes
• Comfort with messy, imbalanced, delayed-label data
• Experience designing and analyzing experiments where a false positive and a false negative cost different amounts
• Strong feature intuition
• Ability to explain model behavior and tradeoffs to merchants, risk ops, banks, and auditors in plain language
• Comfort working with AI-native tooling as a daily driver
• A bias toward action

Nice to have

• Ideally at a payments company, fintech, or marketplace
• Familiarity with graph or network analysis for detecting linked accounts and fraud rings

About the company

Coinflow is a payment service provider specializing in global financial infrastructure with stablecoins, AI-driven fraud prevention, and instant settlement. Headquartered in Chicago, the company serves marketplaces, fintechs, remittance providers, gaming platforms, and ecommerce merchants.