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 · Architecture

Design the infrastructure for A/B testing at scale: 1000 concurrent experiments, each with custom targeting rules. How do you assign users and measure statistical significance?

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Design the infrastructure for A/B testing at scale: 1000 concurrent experiments, each with custom targeting rules. How do you assign users and measure statistical significance?

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