advancedWhatsApp Deep Dive18 of 132
How does WhatsApp handle group messaging at scale — fanning a message out to up to 1024 members?
Tests whether you know large-group fanout is a genuinely harder scaling problem than 1-on-1 messaging.
Ready to design this system end to end?
Generate a complete, structured system design answer — requirements, capacity estimation, API design, architecture, database choice, scaling, caching, fault tolerance, security, trade-offs, and more, walked through the way a strong senior engineer would in a real interview.
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