Head of Payment Security & Transaction Integrity

Role Summary

Coins is seeking a senior leader to establish and own our Payment Security and Transaction Integrity function. This role is responsible for protecting the integrity of payment flows across QRPH, Wallet, Merchant Payments, Crypto-Fiat rails, and future payment products. Unlike traditional cybersecurity roles, this position focuses on business logic vulnerabilities, payment fraud, transaction manipulation risks, settlement integrity, and adversarial testing of payment systems.

Responsibilities

Payment Security Architecture

Review and approve payment flow designs before production launch

Conduct payment threat modeling for all new payment products

Define secure transaction integrity standards

Establish source-of-truth and immutable payment context frameworks

Transaction Integrity

Prevent amount tampering, currency manipulation, replay attacks, merchant spoofing, and settlement abuse

Build transaction verification controls and payment validation mechanisms

Define critical payment control requirements across all payment products

Adversarial Testing

Establish a Payment Red Team program

Simulate malicious user behavior against payment systems

Conduct business logic attack testing and abuse-case validation

Incident Response

Lead investigations of payment-related security incidents

Conduct root cause analysis and drive remediation

Build a payment incident review and governance framework

Fraud & Risk Partnership

Partner with Fraud, Risk, Operations, Compliance, and Engineering teams

Design monitoring and alerting frameworks for transaction anomalies

Reduce financial losses caused by abuse, fraud, and system weaknesses

Governance

Chair Payment Security Review Board

Define payment security standards and launch approval processes

Create risk acceptance and escalation frameworks

Requirements

8+ years in payments, fintech, acquiring, banking, or transaction risk

Deep understanding of payment systems, merchant acquiring, settlement, reconciliation, and transaction processing

Experience with payment fraud, transaction abuse, or payment security

Strong understanding of business logic vulnerabilities and adversarial thinking

Ability to work across Engineering, Risk, Compliance, and Operations teams