I'll Be Backend
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Principles

DRY: one rule, one place in Java, step 2: Members ship free from 2511 languagesDRY: one rule, one placeChange a business rule once and have every feature pick it up.Clean code: extract until it reads in Java, step 2: A discount in the wrong place5 languagesClean code: extract until it readsTurn a long method into named steps you can read from top to bottom.Clean code: rename for intent in Java, step 2: A grace period that never applies10 languagesClean code: rename for intentMake every name say what it means, so the next change lands right.