Grokking the System Design Interview, Volume II
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Step 6: Detailed Component Design

Alice lives in Los Angeles. At 1:00 PM on January 1, she creates a reminder, "Take medication", to fire every day at 9:00 AM by push notification and SMS. Today's 9:00 AM has passed, so the first alert is due on January 2 at 9:00 AM Pacific time, which is 17:00 UTC. From then on, her phone must buzz at 9:00 AM local time every morning, within 3 seconds, while millions of other reminders fire around it.

That one reminder raises four questions, and each has a component that answers it:

1

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