SAAS / MULTI-TENANT APIS
API authorization that survives adversarial use.
For teams with customer-facing APIs, SaaS tenancy, background jobs and privileged workflows that need enforceable access decisions.
SYSTEM RISK / REAL FAILURE CONDITIONS
The boundary is the problem.
User authentication is not object authorization. Tenant membership, resource ownership and action permissions must hold through API controllers, exports, caches, async jobs and support tooling.
TRUST FLOW / ILLUSTRATIVE ARCHITECTURE
- 01Authenticated principal and session
- 02Request object / action / tenant context
- 03Server-side policy enforcement
- 04Database queries and queued jobs
Reference architecture / representative request flow.
NEGATIVE-PATH VERIFICATION
What we'd test
- Cross-tenant object fetch
- Same-tenant peer access
- Modified resource ID after token validation
- Background export retaining caller scope
EXPECTED PROJECT OUTPUTS
What the team receives
- Threat-boundary and policy map
- Reproducible abuse-case test suite
- Finding-to-fix engineering plan
- Rerun evidence on the corrected behavior
Scope, access, deliverables and acceptance conditions are agreed before work begins.
RELATED PROJECT / RESEARCH
Public API authorization lab
Runnable API authorization lab with local test records
Relevant stack: REST APIs · OAuth / OIDC · Node.js · Policy checks · Structured telemetry
Discuss a specific boundary in your system.
Tell us the platform, the failing workflow, any compliance or safety constraints, and what success would look like. No confidential production data is needed in the first message.
Request a scoped review