Design a scalable notification system that supports multiple channels. **Functional Requirements:** - Send notifications via push (iOS/Android), SMS, and email - Support instant, scheduled, and batched notifications - Users can set notification preferences (opt-in/out per channel) - Template-based notification content - Notification history and read/unread tracking **Non-Functional Requirements:** - At-least-once delivery guarantee - Handle millions of notifications per day - Low latency for real-time notifications (< 5 seconds) - Graceful degradation when downstream providers are slow **Scale:** - 10M users - 100M notifications per day across all channels

Push Notification System

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Design a scalable notification system that supports multiple channels.

How would you implement notification aggregation (e.g., '3 people liked your post' instead of 3 separate notifications)?
How would you handle priority notifications (security alerts) vs low-priority ones (marketing)?
How would you implement scheduled notifications (e.g., reminder 1 hour before event)?

Functional Requirements

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Non-Functional Requirements

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