domain-fintech
Fintech domain constraints and design patterns for building precise, auditable financial systems in Rust.
- Enforces decimal precision (never f64) using rust_decimal, immutable transaction records with Arc, and double-entry accounting principles to prevent money loss or inconsistency
- Provides currency newtypes, transaction aggregates, and audit logging patterns aligned with regulatory compliance and dispute resolution requirements
- Maps domain rules (precision, audit trails, consistency, reproducibility) to Rust ownership, type safety, and structured tracing implementations
- Includes common fintech mistakes (floating-point amounts, mutable transactions, string-based values) with fixes and references to related ownership and error-handling skills
FinTech Domain
Layer 3: Domain Constraints
Domain Constraints → Design Implications
| Domain Rule | Design Constraint | Rust Implication |
|---|---|---|
| Audit trail | Immutable records | Arc, no mutation |
| Precision | No floating point | rust_decimal |
| Consistency | Transaction boundaries | Clear ownership |
| Compliance | Complete logging | Structured tracing |
| Reproducibility | Deterministic execution | No race conditions |
Critical Constraints
Financial Precision
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