You've been asked "how would you design this feature so it's still maintainable years from now?" Using a feature you built recently as the example, explain what criteria drove your decisions to make a structure that stays easy to change over time.
Maintainability comes from separating things with different reasons to change and letting the compiler and tests catch mistakes. Protocols at the boundaries so they're replaceable, state made explicit with enums and immutable values, and the core rules pinned down with unit tests on pure functions.
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