SaaS Multi-Tenant Architecture & Enterprise Billing Engine

SaaS Multi-Tenant Architecture & Enterprise Billing Engine

Build and scale a secure, high-margin B2B SaaS platform. This complete turnkey suite delivers guaranteed zero-leakage tenant isolation via PostgreSQL Row-Level Security (RLS), Stripe metered subscription billing, and enterprise role hierarchies.

📦 What is Included in this Downloadable Package:

• SaaS_Multi_Tenant_Engineering_Playbook.pdf: 45+ page definitive playbook detailing multi-tenancy models (DB vs Schema vs RLS), cryptographic boundary enforcement, Stripe usage aggregation, and custom domain SSL routing.
• PostgreSQL Database Migrations (/database-migrations): Battle-tested SQL migrations with FORCE ROW LEVEL SECURITY, tenant context session injection, and metered usage audit tables.
• Stripe Metered Billing Engine (/billing-engine): Production Python service handling customer creation, tiered subscriptions, usage-based consumption reporting, and idempotent webhook handlers.
• Tenant Context & RBAC Middleware (/auth-middleware): Async ContextVar tenant isolation middleware and hierarchical role-based decorators (@require_role('admin')).
• Pricing & Tier Matrix Configuration: Dynamic JSON-driven subscription definitions mapping seat limits and metered thresholds directly to Stripe price IDs.

⚡ Technical Specifications:

• Database: PostgreSQL 14+ with Row-Level Security (RLS)
• Billing Platform: Stripe Billing API (Invoicing, Subscriptions, Metered Usage Records)
• Backend Framework: Python 3.10+ / FastAPI / SQLModel compatible
• Security: Restrictive tenant policies preventing cross-tenant data leaks at database engine level