Design Real-Time Chat Delivery · System Design Interview

Design Real-Time Chat DeliveryDesign how a message typed in one place reaches every participant’s devices — the ones connected now, and the ones that are not.What it has to do

A message reaches connected participants within a moment

Someone offline gets it when they return, and is pushed a notification meanwhile

Each device sees every message once, in the same order as everyone else in the conversation

Scale

Devices connected at peak: 100 million

Messages per second at peak: 2 million

Out of scope

How messages are stored and paged through

End-to-end encryption

Voice and video calls

Moderation

Practise this challengeAll system design challenges

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