idea

CUPID are a set of properties or characteristics of code that make code joyful to work with.

Composable: works well with others. It's easy to use and use again, easy to lean, not tricky, doesn't require lots of dependencies.
Unix-philosophy: does one thing well (slightly opposed to SRP in that it's an external property of "having a single purpose" rather than being specifically tied to code)
Predictable: does what you expect. No surprises, observable, deterministic.
Idiomatic: feels natural. Software written to be understood by someone else. Conform to the idioms of the language. Where there are non, formulate an opinion as a team, document, and conform to it.
Domain-based: solution domain models the problem domain in language and structure. Code should convey what it's doing in the language of the problem domain. Prefer a domain-based structure.

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