Grokking the System Design Interview, Volume II
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Reminder Alert System: Capacity Estimation

Step 3: Back-of-the-Envelope Estimation

Step 2 set the requirements. Before we design anything, we put numbers behind them: how much data the system holds, and how much traffic it takes. Here are rough estimates for a web-scale scenario.

User base. Assume 10 million daily active users use the reminder service. That may be a subset of a larger registered base. Since the service is web-scale, we plan for tens of millions of users later.

Reminders per user. A user may create up to 500 recurring reminders, the cap we set in the requirements

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