B2B SaaS Multi-Tenant Architecture Refactoring
10x Scalability & SOC 2 Certification
[ BUSINESS CONTEXT ]
A rapidly growing European HR-tech startup was manually provisioning a new database and server for every new enterprise client. This single-tenant model was crippling their margins and preventing them from scaling beyond 50 customers.
[ PROJECT CHALLENGE ]
They needed to migrate to a multi-tenant architecture to drastically reduce infrastructure costs, but strict European labor laws required absolute guarantees that one tenant’s HR data could never leak into another tenant’s workspace.
[ STRATEGIC SOLUTION ]
We implemented a robust Row-Level Security (RLS) multi-tenant architecture within PostgreSQL, paired with a stateless backend microservices layer. This provided logical isolation without the overhead of physical separation.
Engineering Methodology
Database Refactoring
Migrated 50 isolated databases into a single clustered PostgreSQL instance utilizing Row-Level Security.
Identity & Access Management
Integrated Auth0 for secure, scalable OIDC/OAuth2 authentication with deep RBAC support.
Stateless API Design
Refactored stateful monolithic services into stateless Node.js microservices for horizontal scaling.
Data Migration
Built custom ETL scripts to map and merge legacy single-tenant data into the new unified schema.
Quantified Engineering Impact
Consolidating databases and utilizing shared compute clusters drastically lowered monthly AWS bills.
New tenant provisioning became a fully automated software process instead of a manual DevOps task.
Row-Level Security enforced tenant boundaries at the database kernel level, passing strict SOC 2 audits.
The platform successfully scaled to support over 500 enterprise clients seamlessly.