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Design Messenger
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Design a Messenger-like 1-to-1 chat system similar to Facebook Messenger or WhatsApp, supporting near-real-time delivery, conversation history, offline delivery, and message status (accepted / deliver...
SWE
system-design
chat
messaging
websocket
kafka
redis
presence
idempotency
read-receipts
Frequency
Low
Last asked
2026-06-21
Stage
onsite-system-design
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