Josef Buttgen spent a year building CourseStart. Minimal traction. Runway shrinking. So he joined the 12-startups-in-12-months challenge out of desperation.

Month 3: a friend validated an idea with just a landing page and booked demo calls before any code existed. They cofounded Setter AI - B2B SaaS that automates lead qualification and follow-up, booking appointments without humans.

Shipped a working prototype in 2 weeks using existing APIs instead of building custom AI voice tech. Grew through SEO (comparison pages, listicles) and cold email. High-touch clients came through sales calls with setup packages alongside subscriptions.

18 months from founding to $10k MRR. His biggest takeaway: "Don't think. Literally. When you're at 0, you don't have anything to think about." Sell before you build. Always.