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

Step 2: Clarify and Define Requirements

Before designing the solution, let’s clarify the key requirements.

Functional Requirements

  • Recurring Reminder Management: Users must be able to create, update (e.g., modify schedule or message), and delete reminders. The system must support heavy usage, allowing up to 500 active recurring reminders per user.
  • Flexible Recurrence Intervals: The system should support standard intervals (hourly, daily, weekly, monthly) and potentially complex schedules (e.g., "every weekday" or CRON-like expressions)

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