Own detection and response for payment and chargeback fraud, card testing, SMS pumping / toll fraud (IRSF), fake and bot registrations, account takeover, phishing and brand/subdomain abuse, supplier-network (CSN) fake-RFP abuse, promotion/loyalty/rewards abuse, refund/payout abuse, and email-platform abuse. Experience at a SaaS, marketplace, fintech, or payments company, ideally one operating as a payment facilitator/platform, and including strong, technical understanding of software-as-a-service and cloud platforms as well as payment-fraud mechanics, chargebacks/disputes, KYC/AML concepts, and internal-control frameworks (e.g., SOX, COSO).