How I Designed an Entire SaaS Using Claude Alone

TL;DR — Tell Claude to "assemble a panel of 6 experts and hold a meeting." It catches blind spots a solo builder would miss. Not real experts, but way better than flying solo. "Remove the login wall first. Magic link auth is your biggest drop-off point." That wasn't a person. It was Claude simulating a "PM" during an expert panel session. In one day, I ran 9 sessions with Claude. Twenty deliverables came out. Business strategy docs, landing page designs, expert panel meeting minutes, LLM cost analysis, global expansion strategy, and task files ready to feed into Claude Code. If I'd hired a consulting firm for this, it would've been weeks and tens of thousands of dollars. Solo, one day, $0. The Key: Progressive Detailing I didn't dump everything at once. The conversation deepened naturally. Turn 1: "Is a fortune-telling app viable?" (abstract) Turn 2: "Design a revenue model with free and paid tiers" (concrete) Turn 3: "Calculate free tier API cost per token" (very concrete) Turn 4: "Co