Fintech Engineering Handbook

Voytek Pitula's Fintech Engineering Handbook collects the patterns for building software where money is the primary object, organised around three unbreakable principles: no invented data (idempotency, deduplication, reconciliation), no lost data (full precision, at-least-once delivery, event sourcing, audit trails), and no trust (verify webhooks, cross-check sources, fail loudly on broken assumptions). Chapters run from money representation — the four precision models and why floating-point is never one of them — through the machinery that keeps ledgers honest. CC BY 4.0, readable end-to-end or as a reference, with the source maintained on GitHub.

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