Good systems don’t promise everything—they promise the right things. Hard internal correctness paired with forgiving interfaces is the secret to resilience.
What “strong guarantees” really mean
- invariants, contracts, safety checks
Internal strictness: not negotiable
- correctness, validation, domain protection
External softness: the UX of engineering
- leniency, compatibility, backwards stability
Examples of good hard/soft boundaries
- APIs, onboarding flows, migrations
How to design for both
- practical patterns
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