Why Your FinTech App is Bleeding Money: ISO 4217 Currency Modeling and Type-Safe Value Objects in TypeScript
This story is from 2026-10-09. It is preserved in the archive; the latest stories are on the live feed.
Every single day, software engineers write code that handles money as if it were a blog post view count or an item quantity in a shopping cart. A price is stored as a floating-point number ( number ), passed across network boundaries inside generic JSON payloads, and manipulated using standard arit…
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- 2026-10-09 20:00 · DEV Community — AI
Why Your FinTech App is Bleeding Money: ISO 4217 Currency Modeling and Type-Safe Value Objects in TypeScript