advancedWhatsApp Deep Dive
How would you design WhatsApp's message delivery system to ensure no message is ever lost?
Tests whether you can combine acknowledgments, persistent queuing, and retry logic into a genuinely reliable delivery guarantee.
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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