How to Build a SaaS Product in 48 Hours Using AI (I Did It)

Last weekend, I set a challenge for myself: build a complete SaaS product — from zero to deployed with a payment system — in 48 hours using AI tools. Not a toy project. Not a landing page. A real product that solves a real problem.

The result: FormFlow, an AI-powered form builder that converts natural language descriptions into production-ready forms with validation, conditional logic, and webhook integrations. It launched on Monday and had 23 paying users by Wednesday.

Here’s every detail of how I did it.

The Tech Stack

Before we dive into the timeline, here’s what I used:

• AI Coding: Claude Code (primary), Cursor (secondary)
• Frontend: Next.js 15 with App Router
• Backend: Supabase (auth, database, edge functions)
• Payments: Stripe (via Supabase integration)
• Deployment: Vercel
• Design: Tailwind CSS + shadcn/ui
• AI Features: Claude API for form generation

Total cost for the 48 hours: $47.23 (API calls + domain name).

Hour 0-4: Ideation and Architecture

Finding the Right Idea

I started by asking Claude to help me brainstorm SaaS ideas with specific constraints:

I want to build a SaaS product in 48 hours. Requirements:
- Solves a real problem people pay for
- Can be built with Next.js + Supabase
- Has a clear monetization model
- AI adds genuine value (not just a wrapper)
- Low ongoing infrastructure costs

Give me 10 ideas ranked by feasibility and market demand.

Form builder won because: everyone needs forms, existing solutions are overcomplicated, and AI can genuinely simplify the creation process. The market validated this — Typeform does $70M+ ARR selling forms.

Architecture Planning

I used Claude Code to design the database schema:

-- Core tables designed in 30 minutes
CREATE TABLE forms (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID REFERENCES auth.users(id),
  title TEXT NOT NULL,
  description TEXT,
  schema JSONB NOT NULL,
  settings JSONB DEFAULT '{}',
  published BOOLEAN DEFAULT false,
  created_at TIMESTAMPTZ DEFAULT now(),
  updated_at TIMESTAMPTZ DEFAULT now()
);

CREATE TABLE submissions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  form_id UUID REFERENCES forms(id) ON DELETE CASCADE,
  data JSONB NOT NULL,
  metadata JSONB DEFAULT '{}',
  created_at TIMESTAMPTZ DEFAULT now()
);

CREATE TABLE webhooks (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  form_id UUID REFERENCES forms(id) ON DELETE CASCADE,
  url TEXT NOT NULL,
  events TEXT[] DEFAULT '{submission.created}',
  active BOOLEAN DEFAULT true
);