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 · Consistency
Design a simple polling system where users vote on yes/no questions and see live results. Each poll gets about 10K votes over 24 hours. Do you update the count synchronously on every vote or use a different approach?
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