1. The SaaS Business Model & Architecture
Software-as-a-Service (SaaS) delivers centrally hosted applications to users over the internet on a recurring subscription basis. Instead of installing software locally, customers access the platform via web browsers or mobile apps.
2. Multi-Tenant Database Isolation Strategies
A crucial architectural decision in SaaS development is data isolation. In a shared-database multi-tenant model, all customers share a PostgreSQL instance with strict `organizationId` foreign key isolation and Row-Level Security (RLS).
For enterprise clients with strict compliance needs, a siloed database model provisions dedicated database instances per tenant while sharing common application microservices.
3. Automated Subscription Billing & Seat Governance
SaaS platforms require integration with payment providers (Stripe/Razorpay) to handle plan upgrades, prorated billing, automated invoice generation, and seat-based access permissions.