We’ve all been there. You sketch out a flawless high-level architecture on the whiteboard, and the interviewer leans in:
“Alright, what database are we using for this component, and why?”
My go-to response used to be a nervous, “Uh, Redis? Because it’s fast?”
Let me tell you from experience, that answer will get you a red flag faster than a race condition.
"Key-Value store" is a massive umbrella. Caching, configuration management, petabyte-scale storage—they all fall under KV, but choosing the wrong one exposes a lack of depth to your interviewer.
