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lecture · 13:03 · 4 checkpoints · browser voiceIntermediate

Notifications: the OTP never waits behind the sale

One strong interview answer to "design a notification system": one send API that stores and queues atomically with an outbox, a router that applies preferences and quiet hours, at-least-once delivery made harmless with idempotency and dedupe keys, breakers and backup providers, and high and bulk paths isolated at every stage so a 50 million message campaign never delays a login code.

Read the problem write-up: Design a Notification System→

01 · Fifty services, three channels

IP-06 · Design a Notification System

Every product ends up sending notifications.

OTPs, orders, sales

Every product ends up sending notifications.

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0:00 / 13:03Fifty services, three channels

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