The 7-Day Interview Prep Cheatsheet
Day 6 — Clean code & the design patterns that come up
The clean-code principles and design patterns interviews reward: SOLID, DRY, YAGNI and KISS, then the patterns that actually appear — Strategy, Factory, Builder, Observer, Singleton, Decorator, Adapter and State — each with when-to-use, questions asked, and exercises.
You open a file to change one line — add a second payment option, rename a label — and an hour later you’re still in there, because touching that one thing quietly broke three others. We’ve all lived it. The interviewer who asks about clean code and design patterns isn’t testing trivia; they’re asking a single question: when I hand you a living codebase, will the next change be cheap or terrifying? Today you and I sort that out. First the handful of principles that keep code soft enough to change, then the small catalogue of named moves — the patterns — that come up again and again in machine-…
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