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Architecture
5 notesProductJun 18, 20261 min
Designing BillParty offline-first: constraints as features
BillParty has no backend, no accounts, no cloud — on purpose. How a hard constraint (works on a plane, lives on one phone) became the product's best feature.
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BillPartyArchitectureOffline
ArchitectureJun 10, 20261 min
Tests as living contracts
A good test suite isn't a safety net you tolerate — it's the executable specification of what your system promises, including the properties that must always hold.
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TestingArchitectureDecisions
ArchitectureJun 8, 20261 min
Make decisions reversible
You can't reliably predict the right call. So optimize for cheap mistakes: prefer decisions you can walk back over ones you have to get right the first time.
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ArchitectureDecisions
ArchitectureJun 5, 20261 min
Boundaries before features
Why I draw the lines between modules before writing a single feature — and how it keeps a codebase from rotting as it grows.
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ArchitectureBoundariesDecisions
ArchitectureJun 3, 20261 min
Why I store money as integers
Floats and currency don't mix. A short note on a decision I make on every project that touches money — and why it keeps balances exact.
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ArchitectureDomainDecisions