Multi-Tenant Billing That Survives Its First Thousand Customers

Subscriptions, proration and the queue design that keeps invoices honest.

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Where It Starts

Every project of this shape begins the same way: a working prototype that proves the idea, and then the far longer job of making it dependable. The prototype takes a weekend. The dependability takes months.

What follows is the part worth writing down: the decisions that were not obvious at the time, and the ones I would make differently now.

What I Would Keep

Boring infrastructure, aggressive logging, and a contract between services that a new developer can read in one sitting. Everything clever should live in the product, not in the plumbing.