How do you design multi-tenant SaaS data isolation?
Reported in Roblox interview loops. Architecture discussion around tenant security and scaling models.
Interview scenario
Context for Roblox candidates:
Build a B2B SaaS platform supporting many tenants with different compliance needs.
Model answer
Try answering aloud first
Cover trade-offs, structure, and a concrete example before revealing the baseline response.
How to frame this at Roblox: Connect your answer to measurable impact, clarity of thought, and trade-offs the team cares about. Below is a strong baseline response you can adapt with your own project examples.
Explain isolation options: shared schema with tenant id, schema per tenant, and database per tenant. Shared schema is cheapest but needs strict row-level authorization; dedicated databases improve isolation at higher operational cost.
Use tenant-scoped keys, quotas, and encryption boundaries. Always propagate tenant context through auth token, service calls, cache keys, and job queues to avoid cross-tenant data leaks.
Operationally, include tenant-aware observability and migration tooling so upgrades can be rolled out gradually without global risk.
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