Design Studio — Design a Notification System
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Requirements
Scale & non-functional
- 10M notifications/day ≈ 116/sec average, 500/sec at peak
- Split across channels: 60% push, 30% email, 10% SMS
- CRITICAL notifications must be delivered within 5 seconds end-to-end
- MARKETING notifications can tolerate up to 60 seconds of delay
- 99.9% delivery rate — at most 10,000 permanent failures per day
- System must handle provider outages gracefully (retry, fallback)
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