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 · Scaling

Design a system that tracks the number of page views for each article on a news site. Articles get 10M views per day total. Do you increment a counter in the database on every view, or batch updates? What breaks first?

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