Field Notes

Why double Will Break Your Fintech App (and How We Handle Money in Dart)

Floating-point money bugs aren't exotic edge cases — they're a predictable consequence of how double works, and they show up in almost every fintech codebase at least once. Here's the pattern that prevents them permanently.

A Money Extension Type That Makes 0.1 + 0.2 == 0.3 Fail Loudly, Not Silently

Dart's extension types turn a money precision bug from a runtime surprise into a compile error, at zero runtime cost. Here's the pattern.

Nov 2023 · 5 min read

Future vs Stream: which and why?

A practical breakdown of Dart's two async primitives: when to use each, and what happens when you mix them up.