I specialize in multi-tenant SaaS architecture—building applications that serve multiple organizations from a single codebase while keeping data isolated, secure, and performant. Whether you're launching a B2B product or scaling an existing one, I design and implement tenant-aware backends that grow with your business.

Multi-tenancy means one application serves many customers (tenants) with logical data separation. I use PostgreSQL Row-Level Security (RLS) to enforce tenant isolation at the database level, ensuring that queries automatically filter by tenant ID. This approach is more secure and maintainable than application-level checks alone. RLS policies run at the database layer, so even if application code has a bug, tenants cannot access each other's data. I design tenant models that scale from dozens to thousands of organizations. The architecture supports white-labeling, tenant-specific configurations, and usage-based billing.

I build multi-tenant systems with FastAPI or Django, PostgreSQL, and Redis. Tenant context is passed via JWT claims, API keys, or subdomain routing. I implement RLS policies, connection pooling per tenant when needed, and schema strategies (shared schema with tenant_id vs schema-per-tenant) based on your scale and compliance needs. For most B2B SaaS, a shared schema with a tenant_id column is the right choice—it's simpler to maintain and query. For strict isolation or compliance requirements, schema-per-tenant or database-per-tenant can be used. I set up middleware that injects tenant context into every request and ensures it's never forgotten.

Typical projects include: project management tools, CRM systems, HR platforms, billing and invoicing software, and industry-specific SaaS. I've built tenant onboarding flows, usage-based billing integration (Stripe), and admin dashboards for tenant management. Each tenant gets their own workspace, users, and data—all from one codebase. I've built SaaS for agencies managing multiple clients, platforms connecting buyers and sellers, and internal tools used by hundreds of teams. The key is designing for tenant isolation from the start.

Clients often struggle with: migrating from single-tenant to multi-tenant, performance at scale, compliance (GDPR, SOC2), and tenant-specific customizations. I address these with clear architecture decisions, documentation, and incremental migrations that don't disrupt existing users. Migrating to multi-tenant is a significant undertaking—I plan it in phases, add tenant context gradually, and ensure data integrity throughout. For performance, I optimize queries, add indexes, and use caching where appropriate. Compliance requirements often need audit logs, data export, and deletion—I build these into the architecture.