Grokking the System Design Interview, Volume II
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Reminder Alert System: System Definition

Step 1: System Definition

You set a reminder to take medication at 9:00 AM, or to leave for a flight at 4:00 PM. When that moment comes, an alert reaches you: an email, a text, a push notification, or a message inside an app. In this case study, we design the service behind that alert.

A reminder alert system lets users schedule alerts like these. When an alert is due, the system delivers it through the channel the user picked. It is one central service that stores every scheduled event and sends each message out on time.

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