Grokking System Design Interview, Volume II
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Design a Reminder Alert System
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A Notification System for Reminders is a platform that lets users schedule reminders and delivers timely alerts through various channels (email, SMS, push notifications, or in-app) when those reminders are due. The system acts as a central hub to manage scheduled events (reminders) and dispatch notifications to users via their preferred channels. A real-world analogy is the reminder feature in Slack or calendar apps – for example, Slack relies on scheduled jobs to ensure messages and reminders reach users at the right time

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