Cancer blood tests are everywhere. Do they really work?

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Think about interviews. You’re in a system design round, and you propose a simple solution. A single database, a straightforward API, maybe a caching layer. The interviewer is like: “What about scalability? What if you have ten million users?” So you add services. You add queues. You add sharding. You draw more boxes on the whiteboard. The interviewer finally seems satisfied now.

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