Grokking the System Design Interview, Volume II
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Step 2: Requirements

Most of what users expect from a reminder service is unspoken. Nobody says "and keep firing at 9:00 after the clocks change," but everyone expects it. The requirements below make those expectations explicit.

Functional Requirements

  • Recurring reminder management. Users create, update, and delete reminders. An update can change the schedule, the message, or the channels. Each user may have up to 500 active recurring reminders.
  • Flexible recurrence. Standard intervals are hourly, daily, weekly, and monthly

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