Multi-Tenant SaaS Backend
JWT Authentication, RBAC, PostgreSQL & Redis
Key Results
The Problem
Personal backend project focused on tenant isolation, authentication, authorization, and scalable API architecture.
How can multiple organizations securely share the same backend infrastructure while keeping their data isolated and access controlled?
Investigation & Analysis
Explored JWT authentication, refresh token strategies, role-based access control, PostgreSQL row-level security patterns, and tenant-aware API design.
Solutions Implemented
JWT authentication with refresh token flow
Role-based access control (RBAC)
Tenant-aware middleware
PostgreSQL schema design
Redis caching and rate limiting
Input validation and error handling
Results: Before vs After
Engineering Lessons Learned
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Authentication becomes complex quickly when multiple organizations are involved
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Database design decisions impact future scalability
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Authorization should be centralized and consistent
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Rate limiting is important even for internal APIs
Technologies & Tools
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