System designHardsd-g220

Subject Multi regionLevel Senior–Staff~50 minCommon in Databases & SQL · Concurrency · Distributed systems interviewsIndustries Technology, Software development

Question

Design the multi-region architecture for a B2B HR/payroll SaaS serving enterprise tenants in the US, EU, and India. EU tenant data must never leave the EU and Indian tenant data must stay in India (data-sovereignty law), yet the company wants a single global application and the ability to recover a region within an hour if it's lost. How do you place tenant data, route requests, and do disaster recovery without violating sovereignty?

What a strong answer looks like

Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts — data model, bottlenecks, consistency, failure modes — and name the trade-offs you are making.

Learn the concepts

Narrate your design

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Run or narrate your approach, then ask the coach.