The constraint
Keep validation fast on every request while supporting secure session, role, attribute, and tenant policy decisions.
Case study · Security · Multi-tenant
Authentication & Authorization Service
A centralized identity service for multi-tenant applications, covering OAuth2, JWT sessions, refresh flows, and role- and attribute-based access decisions.
request lifecycle
architecture.flowClient
Identity
Policy
Session
Audit
The solution
Kept token verification local and fast while Redis handled distributed session state and revocation. Tenant-scoped policies and rate limits were evaluated before protected service access.
architecture highlights
- JWT and refresh tokens
- Distributed sessions
- RBAC and ABAC
- Tenant rate limits
- Audit logging
scalability considerations
- Cache public signing keys
- Avoid central calls on every request
- Partition rate-limit state by tenant
- Rotate credentials without downtime
project outcomes
- 1M+ authentications per day
- Sub-10ms token validation
- Multi-tenant policy isolation
- Centralized audit trail
runtime.dependencies
Technology stack
NestJSPostgreSQLRedisOAuth2JWTKubernetes
engineering ownership
My contribution
Designed token validation, distributed session management, tenant rate limiting, and auditable RBAC/ABAC policy checks.