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How can ONE failing service bring down an entire distributed system? A slow database causes inventory requests to stall.

Welcome. Today we are designing a URL shortener, the kind of service behind TinyURL and bit dot ly. The idea is simple: take a ...

How does Uber match you with a nearby driver in seconds? Live location indexing, sharded dispatch, surge pricing math, and ...

Why did our AI system process the same PDF twice? Two workers picked up the same job — leading to duplicate LLM calls, ...