advanced~3.5h

Design a Banking System on AWS

A worked system-design example for a core banking/ledger system on AWS — the strict consistency, auditability, and compliance requirements that push this design toward RDS transactions, double-entry ledgers, and heavy encryption/audit logging.

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🎓 Learning objectives

  • Explain why a banking ledger needs strict ACID transactional guarantees, unlike most other system-design examples in this course
  • Design a double-entry ledger schema and explain why it's the standard approach
  • Identify every AWS service needed to meet typical financial compliance/audit requirements
  • Explain idempotency's critical role in preventing duplicate financial transactions

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Related concepts

rds-fundamentalskms-encryptionguardduty-macie-security-hub