These are HLD questions of the kind Microsoft actually asks — the patterns reported from Microsoft's AI-engineering rounds, where design trade-offs, scale and failure modes matter as much as definitions. Treat this page as a mock interview: say every answer out loud before revealing it. If one surprises you, the lesson behind it is linked at the bottom.
Microsoft HLD concept questions
Microsoft interviewers (especially for cloud/Azure-adjacent teams) often ask how you'd isolate different customers' data in a shared multi-tenant system. What's the core trade-off between a shared database with a tenant_id column versus one database per tenant?
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Why do enterprise-facing systems (like Microsoft's cloud services) typically need much stricter RTO/RPO targets than a typical consumer app, and what does this cost architecturally?
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Microsoft HLD applied & hands-on questions
Microsoft-style: your SaaS product uses a single shared database with a tenant_id column. Propose two concrete safeguards that reduce the risk of a query accidentally leaking data across tenants.
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How to use this page: Microsoft rarely asks something you've never seen — they ask a standard HLD concept and then push one level deeper ("why?", "what would you do if..."). Master the concept in the HLD course lessons, and the follow-up stops being scary.
Keep practising: Caching Explained, Databases at Scale, Design a URL Shortener and Interview Framework cover what most Microsoft HLD rounds test.