Architecting Multi-Tenant Billing Engines: A Database Schema Guide
When building a Software-as-a-Service (SaaS) application, developers often spend most of their time refining the core product. You design the primary features, optimize the user interface, and ensure your system handles concurrent requests smoothly.
But as your platform begins to acquire paying users, you quickly run into a silent project-killer: the billing engine.
Many engineers make the mistake of treating subscription billing as a simple add-on. They add a couple of columns—like plan_type and subscription_status—to their existing users database table, connect a payment gateway client, and call it a day.
This basic approach breaks down almost immediately when you scale.
