The Vercel Hobby plan gives you 12 serverless functions. That sounds like plenty until you're six months into building a SaaS and you start counting. At IssueCapture — a drop-in widget that sends bug reports directly into Jira — we hit this wall faster than expected. Account management, API keys, analytics, Jira OAuth, payments, AI processing, widget submission, system utilities, admin operations. That's already eight distinct domains before you've split anything out. We're currently sitting at 9 of 12 used. Getting there without burning through the limit required being deliberate about how we structure the API layer. Why the Limit Bites You Vercel counts any file in api/ as a serverless function. The instinct is to create a new file for each endpoint — it's clean, it's what every tutorial shows. But on the Hobby plan, that habit will strand you at the ceiling right when your product is getting interesting. The good news: Vercel only counts top-level api/*.ts files.…