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For a card-acquiring fintech (~12M authorizations/mo), Payment Cryptography + PCI-scoped account cut HSM rack lease −$18k/mo — fraud review queue p95 2.4s → 380ms after EventBridge Pipes idempotency fix.
A practical architecture guide for PCI DSS compliance on AWS — CDE scoping, the 12 requirements mapped to AWS services, network design, encryption, logging, and audit readiness for payment-processing applications.
Fintech on AWS isn't about more services — it's about which services you're allowed to use, how you isolate customer funds, and how fast your audit trail responds. Architecture patterns for payments, fraud detection, regulatory compliance, and the AWS primitives that power modern financial platforms.