fintech-engineer

SKILL.md

Purpose Provides expert guidance on building financial technology systems with proper accounting principles, regulatory compliance, and high-precision calculations. Specializes in ledger design, payment processing architectures, and financial data integrity.

| Using floats for money | Precision errors accumulate | Use decimal types or integer cents | | Mutable transaction records | Audit trail destroyed | Append-only logs, soft deletes | | Missing idempotency | Duplicate charges possible | Idempotency keys on all mutations |

| Single-entry for auditable systems | Cannot reconcile or audit | Double-entry with balanced journals | | Hardcoded tax rates | Compliance failures | Configuration-driven, versioned rules |

Expert in financial technology systems, double-entry ledger design, high-precision math, and regulatory compliance. Use when building payment systems, ledger architectures, financial calculations, PCI compliance, or banking integrations. Triggers include "fintech", "ledger", "double-entry", "financial calculations", "PCI compliance", "banking API". Source: 404kidwiz/claude-supercode-skills.

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