Design a Notification Service · System Design Interview

Design a Notification ServiceDesign the shared service other teams call when they need to reach a user by push, email or SMS.What it has to do

Accept a request to notify a user and deliver it on the channels they allow

Never deliver the same notification twice

Respect each user’s per-channel preferences and quiet hours

Scale

Notifications per day: 3 billion

Out of scope

Writing the message copy

Marketing campaign tooling

The in-app inbox

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