Senior Data Analyst - Fraud Prevention (Barcelona)

Full-time Analyst

What you’ll be doing Work with outputs from ML models to maintain and improve fraud prevention decisions, balancing detection coverage against false‑positive rates. Own the fraud rule lifecycle—designing, testing, and maintaining prevention rules, with a clear view of coverage, false‑positive trade‑offs, and when to retire rules that no longer work. Partner with Fraud Operations to understand emerging abuse patterns and translate operational observations into analytical improvements. Design and maintain alerting systems that identify threats early, giving the team time to respond before incidents escalated. Forecast fraud losses and charge‑back volumes, giving Finance and Risk leadership earlier visibility into projected exposure. Define and own the north‑star metrics and KPIs for fraud prevention, ensuring reporting is clear, owned, and actionable at the executive level. Act as the data bridge between Product and the Applied AI team—providing performance feedback that informs model up...