Coach note
System-design questions are about the trade-offs you make when no answer is obviously right. Interviewers want to see scope, the bottleneck you pick, and the rejected designs you can articulate.
System design · Tradeoffs
Design a system that sends daily email digests to users summarizing their activity. You have 500K users. Do you generate emails on-demand when users open them or pre-generate and store them? Walk through your reasoning.
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