Fintech Engineering Handbook
The Fintech Engineering Handbook is a resource that describes patterns used in software engineering for systems that handle money. It aims to provide a comprehensive understanding of the domain and the patterns that make money systems trustworthy. The handbook is meant to be a living document, and contributions are welcomed to help people in and outside the fintech industry understand how to build reliable money systems.
- ▪The handbook is designed for people joining fintech, those already in the industry, and people outside fintech who want to understand how building for money differs from other systems.
- ▪The handbook emphasizes three key principles: no invented data, no lost data, and no trust, to ensure that money is handled accurately and securely.
- ▪The handbook discusses the importance of representing money correctly, including the use of precision handling and rounding strategies to avoid precision losses and ensure accurate calculations.
Opening excerpt (first ~120 words) tap to expand
Fintech Engineering Handbook Patterns for building software that handles money Author Voytek Pitula Modified June 25, 2026 Welcome to the Fintech Engineering Handbook. This resource aims to describe the most important patterns used in software engineering, where money is the primary focus of the system. It can be read in full to get a comprehensive understanding or in parts when dealing with a particular problem. For whom? People joining fintech. To get familiar with the domain and the patterns that make money systems trustworthy. People already in fintech. As a reference to reach for when facing a particular problem, and a shared vocabulary to point colleagues at. People outside fintech. To understand how building for money differs from what they’re used to, and why.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Pitula.
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