Multi-tenant platforms host distinct client organizations (tenants) within a shared infrastructure. JWTs support multi-tenancy through embedded isolation claims:

1. **Tenant ID Claim**: Embed a `tenant_id` or `org_id` claim in the signed JWT payload.
2. **Issuer Scope Separation**: Configure custom issuer URLs per tenant (e.g., `https://auth.app.com/tenants/tenant_abc`).
3. **Database Isolation Enforcement**: API middleware extracts `tenant_id` from the verified JWT and automatically appends `WHERE tenant_id = ?` filters to all SQL database queries.

Q31: How do you architect JWT Authentication for a Multi-Tenant SaaS platform?

Q32: What is WebAuthn / Passkeys and how does passwordless authentication work?

Q30: What is DPoP (Demonstrating Proof-of-Possession, RFC 9449) and how does it prevent token theft?

Comprehensive technical interview bank covering token-based security, protocol grant flows, cryptographic signatures, session management, and enterprise API security.

50 Essential Interview Questions: JWT, OAuth 2.0, OIDC, and API Security

Q31: How do you architect JWT Authentication for a Multi-Tenant SaaS platform? - 50 Essential Interview Questions: JWT, OAuth 2.0, OIDC, and API Security

Q31: How do you architect JWT Authentication for a Multi-Tenant SaaS platform?

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