System Design·60 minMembers

Group Chat / Messaging System Design

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Design a group-chat / messaging product that supports 1:1 and group conversations, real-time delivery, offline message retention, and read receipts. Asked at both the phone-screen-SD slot and onsite s...

SWE

MLE

chat

messaging

websocket

fan-out

schema-design

scaling

presence

medium

Frequency

Medium

Last asked

2026-06-22

Stage

onsite-system-design

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