Head of Payment Security & Transaction Integrity

Team: Security

Location: Any, Hong Kong, SAR, Singapore, Singapore

Commitment: Full-time Employee

Workplace Type: hybrid

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