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A full mock interview: clarify 500 tenants across three regions, estimate 50 TB, 1,000 requests a second and a 3 TB index, sketch regional data planes under a metadata-only control plane, then deep-dive into five isolation layers, quotas and fair queues, residency and export, ordered deletion, and layered security, and finish with 10x scaling, edge cases, per-tenant monitoring and alerts. Every Week 9 idea in one answer.
Previously, on Day 5, you built the security architecture: defence in depth, zero trust, encryption with per-tenant keys, secrets in a vault, and tenant-first authorisation.