Build a SaaS with Next.js and Supabase in 30 Days

Why Next.js + Supabase Is the Ultimate Stack to Build a SaaS Fast

Launching a SaaS has never been more accessible. With the Next.js + Supabase stack, you get a high-performance fullstack framework paired with a complete backend-as-a-service — authentication, PostgreSQL database, file storage, Edge functions — all without managing a single server.

At Otomy, we've helped multiple SMBs across France and Algeria build digital products from scratch. This guide distills our hands-on experience into a concrete plan to launch a SaaS with Next.js and Supabase in 30 days.

Week 1: Validation and Architecture (Days 1-7)

Day 1-2: Validate Before You Code

Before writing a single line of code, validate your concept:

Build a landing page with Next.js + Vercel in under 2 hours
Add a waitlist signup form powered by Supabase Database
Run a small test campaign on LinkedIn or Facebook (budget: $50)
Measure conversion rate: > 5% = green light

Day 3-5: Define Your MVP

List 3 features maximum for your MVP:

The core feature that solves the primary problem
User authentication
A minimal dashboard

Golden rule: if a feature isn't essential on Day 1 for your users, it waits for v2.

Day 6-7: Set Up the Technical Architecture

npx create-next-app@latest my-saas --typescript --tailwind --app
npm install @supabase/supabase-js @supabase/ssr stripe

Recommended structure:

/app
  /(auth)/login/page.tsx
  /(auth)/signup/page.tsx
  /(dashboard)/dashboard/page.tsx
  /api/webhooks/stripe/route.ts
/lib
  supabase/client.ts
  supabase/server.ts
  stripe.ts
/components
/types

Configure right away:

Supabase: project + user tables, Row Level Security (RLS)
Vercel: continuous deployment from GitHub
Stripe: test account for payments

Week 2: Authentication and Database (Days 8-14)

Complete Authentication in One Day

Supabase Auth handles everything: email/password, OAuth (Google, GitHub), magic links.

import { createClient } from '@/lib/supabase/server'

export async function signUp(email: string, password: string) {
  const supabase = createClient()
  const { data, error } = await supabase.auth.signUp({
    email,
    password,
  })
  return { data, error }
}

Database Modeling

Create your tables directly in the Supabase Dashboard or via SQL migrations:

CREATE TABLE profiles (
  id UUID REFERENCES auth.users PRIMARY KEY,
  full_name TEXT,
  plan TEXT DEFAULT 'free',
  created_at TIMESTAMPTZ DEFAULT NOW()
);

ALTER TABLE profiles ENABLE ROW LEVEL SECURITY;

CREATE POLICY "Users can view own profile"
  ON profiles FOR SELECT
  USING (auth.uid() = id);

Route Protection Middleware

// middleware.ts
import { createServerClient } from '@supabase/ssr'
import { NextResponse } from 'next/server'

export async function middleware(request) {
  const supabase = createServerClient(/* config */)
  const { data: { user } } = await supabase.auth.getUser()
  
  if (!user && request.nextUrl.pathname.startsWith('/dashboard')) {
    return NextResponse.redirect(new URL('/login', request.url))
  }
  return NextResponse.next()
}

Week 3: Core Features and Payments (Days 15-21)

Build the Main Feature

Focus 100% of your energy on the feature that justifies the subscription. Concrete examples:

Invoicing SaaS → PDF invoice generator
Analytics SaaS → real-time chart dashboard
Automation SaaS → integration with n8n or Make via webhooks

Integrate Stripe for Monetization

Use Stripe Checkout for a quick setup:

Create products and prices in the Stripe dashboard
Implement a webhook at /api/webhooks/stripe to handle events
Store subscription_status in Supabase
Use RLS to gate premium features

Automate with n8n or Make

Connect your SaaS to automation workflows:

New user → Slack notification + welcome email via Resend
Successful payment → plan upgrade + invoice delivery
Churned user → automated re-engagement sequence

Week 4: Polish, Test, and Launch (Days 22-30)

Day 22-24: Professional UI/UX

Use shadcn/ui for accessible, elegant components
Add dark mode (native with Tailwind CSS)
Optimize responsive design for mobile
Integrate Claude AI or the OpenAI API for intelligent features (summaries, suggestions)

Day 25-27: SEO and Performance

Set up dynamic metadata with Next.js generateMetadata()
Add automatic sitemap.xml and robots.txt
Enable ISR (Incremental Static Regeneration) for marketing pages
Target Lighthouse score: > 90 across all 4 metrics

Day 28-29: Testing and Security

E2E tests with Playwright on critical flows (signup, payment, dashboard access)
Security audit: verify every RLS policy in Supabase
Configure security headers in next.config.js
Set up monitoring with Sentry for production errors

Day 30: Launch Day 🚀

Launch checklist:

Custom domain configured on Vercel
Stripe switched to production mode
Transactional emails set up via Resend or Postmark
Published on Product Hunt, IndieHackers, Twitter/X
LinkedIn post with a demo video
Analytics configured (Plausible or PostHog)

Recommended Full Tech Stack

Component	Tool	Monthly Cost
Frontend + API	Next.js on Vercel	$0 (hobby)
Database + Auth	Supabase	$0 (free tier)
Payments	Stripe	2.9% + $0.30/tx
Emails	Resend	$0 (3,000/mo)
Automation	n8n (self-hosted)	$0
Monitoring	Sentry	$0 (free tier)
Analytics	Plausible	$9/mo

Total cost at launch: under $10/month.

Critical Mistakes to Avoid

Over-engineering: you don't need microservices for an MVP
Ignoring RLS: a database-level security flaw can compromise everything
Delaying monetization: integrate Stripe by week 3
Building in isolation: show your product from week 1, collect feedback
Neglecting SEO: Next.js offers native SSR — leverage it from day one

Conclusion: Take Action Now

Building a SaaS with Next.js and Supabase in 30 days isn't a fantasy — it's a proven methodology. The stack is mature, startup costs are nearly zero, and the community support is massive.

At Otomy, we help entrepreneurs and SMBs turn ideas into real digital products. Need technical or strategic guidance to launch your SaaS? Get in touch — we go from idea to product, together.

Launch a SaaS in 30 Days with Next.js and Supabase