Design a notification service.

Question

Sarfaraz Siddiqui · Accepted Answer

* Multi-channel support: Send notifications via Email, SMS, Push, and in-app
   messages.

* Multiple notification types: Support transactional (e.g., order
   confirmations), promotional (e.g., discounts), and system alerts (e.g.,
   password reset).

* Scheduled delivery: Allow notifications to be scheduled for future delivery.

* User preferences: Respect user opt-in/out settings and preferred
   channels/times.

* Reliability: Ensure at-least-once delivery, with retry mechanisms for failed
   attempts.

* Rate Limiting: Prevent users and external services from being spammed with
   too many notifications

Design a notification service.

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