How I'd Ship a Micro-SaaS in a Weekend (Step-by-Step with AI)

You have a SaaS idea. You've been thinking about it for months. But building it feels like a 3-month project. What if you could go from idea to paying customers in 48 hours? Here's the exact playbook — based on a real use-case where a developer shipped "ScreenInvoice" (screenshot → invoice PDF) in one weekend. Day 1, Morning: Validate in 2 Hours Before writing a single line of code: Score your idea on 10 factors (urgency, market size, pricing potential, etc.). If it scores below 50/100, pick a different idea. Shadow test : Spin up a landing page with Vercel + Next.js. Run $50 in Google Ads. If you get 20+ signups in 24 hours, you have demand. Day 1, Afternoon: Build the Core (4 Hours) Only build the ONE thing that makes your product valuable. Auth with Clerk (5 min setup), payments with Stripe Checkout (copy-paste), database with Prisma + Neon Postgres. Day 1, Evening: Landing Page Your page needs 4 things: headline, demo GIF, pricing ($19/month), and CTA button → Stripe Checkout. Day