How I built multi-tenant Row Level Security with Aurora PostgreSQL for a B2B SaaS — H0 Hackathon

Short summary

A developer shares how they implemented PostgreSQL Row Level Security (RLS) at the database layer instead of application-level filtering to enforce multi-tenant data isolation in their B2B SaaS platform InspectIQ, with code examples, security rationale, and deployment patterns on Aurora Serverless. The approach eliminates entire classes of security bugs where a missed WHERE clause could expose one customer's data to another, particularly important in regulated industries. InspectIQ is now live with paying customers.

• •Database-layer Row Level Security is more secure than application-level tenant_id filtering for multi-tenant SaaS
• •RLS policies are enforced even if a developer forgets a WHERE clause, preventing accidental data leaks
• •Aurora PostgreSQL Serverless is cost-effective for early-stage SaaS with pay-per-use scaling

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