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Numbers that matter
Estimation proves you understand scale. Calculate:
QPS (Queries Per Second): million daily users ÷ seconds ≈ QPS average. Peak is -x.
Storage: million users × KB per user = GB. Over years = GB.
Bandwidth: QPS × average response size.
You don't need exact numbers. Interviewers want to see that you think about scale. Round aggressively. becomes . Close enough.
