advancedSystem Design129 of 132
What happens if one region goes down?
Tests whether your design assumes multi-region failover with health-check-based DNS/traffic rerouting, and whether you've considered data replication lag between regions -- failover without replicated data just moves the outage, it doesn't fix it.
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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