How to Build a SaaS as a Solo Developer

What You're Building

A SaaS is a web application that people pay for monthly or yearly. It's the holy grail of solo developer businesses because once it works, recurring revenue keeps coming in while you sleep. The catch? It's also one of the hardest things to build and sell by yourself.

I've built three SaaS products solo. Two are still running and generating revenue. The third failed because I built something nobody wanted, not because the tech was wrong. If you go in with the right approach, this is absolutely doable as one person.

Difficulty & Timeline

Recommended Tech Stack

Next.js with Supabase and Stripe on Vercel. This gives you a full-stack TypeScript app with authentication, database, and payments in one cohesive setup. You can go from zero to deployed MVP in a single weekend if you scope aggressively.

If you prefer Python, Django with the built-in admin panel and Stripe integration is equally solid. I've used both. Next.js is faster to launch, Django is faster to add complex backend features later.

These are all mature, heavily maintained projects, which is exactly what you want when you are the only one carrying the pager. Here are the current versions and the adoption signals as of late May 2026.

Pin these in your package.json and requirements.txt so a fresh install months from now does not silently pull a breaking major. For the Node packages that means lines like "next": "16.2.6", "@supabase/supabase-js": "2.106.2", and "stripe": "22.2.0". For Django, Django==6.0.5.

Step-by-Step Plan

Phase 1: Foundation (Week 1-2)

Start with the boring stuff. Authentication, a basic dashboard layout, and your database schema. I know you want to jump straight to the exciting core feature. Don't. A SaaS without login, billing, and a sensible database design is just a demo.

Set up Supabase for auth and database. Wire up Stripe for payments. Build a simple pricing page with two plans. Most of this is copy-paste from starter templates, and that's fine. Don't reinvent what's already been solved a thousand times.

Phase 2: Core Features (Week 3-6)

Now build the ONE thing your SaaS does. Not five features. One. I made the mistake of building an entire feature suite before launch on my first SaaS. Nobody used 80% of it. Pick the single feature that solves a painful problem and make it work really well.

Build it, test it with 3-5 people you trust, and iterate based on their feedback. If you can't explain what your SaaS does in one sentence, you've built too much.

Phase 3: Polish & Launch (Week 7-8)

Add a landing page that explains the value proposition clearly. Set up transactional emails (welcome email, subscription confirmation, password reset). Add basic error tracking with Sentry (the @sentry/nextjs package is at 10.55.0, and Sentry's free Developer plan covers 5,000 errors per month, which is plenty for launch). Make sure the payment flow works flawlessly end to end.

Then launch. Post on Product Hunt, Indie Hackers, relevant subreddits, and X (Twitter). Your first launch won't be perfect. That's fine. Ship it.

Monetization Strategy

Start with simple subscription tiers. A free plan with limited usage, a paid plan at $19-49/month, and maybe a higher tier at $79-149/month. Price based on value, not cost.

Here's what I've learned. Solo SaaS developers almost always underprice. If your tool saves someone 5 hours per month, charging $29/month is a steal. Don't race to the bottom on pricing. You're not competing with VC-funded companies that can afford to give things away.

Add usage-based pricing (credits, API calls, storage) as a growth lever. Users who hit limits are your most engaged customers, and they'll happily pay more.

What It Actually Costs to Run

One reason the solo SaaS math works is how cheap the infrastructure is until you have real traction. With the recommended stack you can launch for close to nothing and only start paying once you have paying users. Current published pricing (late May 2026):

Stripe is the one cost that scales with revenue rather than usage, and that is fine, you only pay it when money is actually moving. So at launch your real fixed cost can be $0, and even a comfortable production setup (Supabase Pro plus Vercel Pro) runs about $45/month before Stripe's per-transaction cut. Check current pricing before you build a financial model on it, vendors change these tiers.

Common Mistakes to Avoid

Building in isolation for 6 months. Talk to potential users before you write a single line of code. I spent four months on a SaaS that exactly zero people were willing to pay for. That pain still stings.

Over-engineering the architecture. You don't need microservices, Kubernetes, or event-driven architecture. A monolith with a good database schema will serve you well past $10k/month in revenue.

Ignoring churn. Getting new users is exciting. Keeping them is what makes a SaaS sustainable. Track why people cancel and fix the top reasons. This matters more than any new feature.

Trying to compete on price. If your only differentiator is being cheaper, you'll lose. Compete on ease of use, specific niche focus, or customer support. Those are things a solo developer can actually win on.

Common Errors and Fixes

These three bite almost every solo founder building on this exact stack. Each one cost me a frustrating evening at least once.

Stripe webhook signature verification fails in the App Router. You wire up stripe.webhooks.constructEvent(...) and it throws on every webhook. The cause is that the body must be the raw bytes Stripe signed, and if you call request.json() first the runtime re-serializes the payload so the signature no longer matches. In a Next.js App Router route handler, read the raw text first with const body = await request.text(), verify against that string, then parse it yourself. Force the Node.js runtime with export const runtime = 'nodejs' so the edge runtime does not re-encode the body. The old Pages Router trick of export const config = { api: { bodyParser: false } } does not apply to route handlers. Stripe documents the verification flow at docs.stripe.com/webhooks/signature.

"New row violates row-level security policy" on insert (Postgres error 42501). Supabase ships with Row Level Security on by default, so a freshly created table with no policies rejects every write. Add an explicit policy for each operation you need (INSERT, SELECT, UPDATE), and remember that an UPDATE must satisfy both the UPDATE policy's WITH CHECK and the SELECT policy's USING clause to succeed. Owner-based policies also require an authenticated session, so confirm the request actually carries the user's token. For trusted server-side writes, use the service role key, which bypasses RLS, but never expose that key to the browser. See supabase.com/docs/guides/database/postgres/row-level-security.

Environment variables that work locally but are undefined in production. In Next.js, only variables prefixed with NEXT_PUBLIC_ are inlined into the client bundle. Your Stripe secret key and Supabase service role key must stay server-only (no prefix) and must be set in your host's dashboard, not just your local .env. After adding a variable in Vercel you have to redeploy for it to take effect, since env vars are baked in at build time. Keep secret keys out of any code path that runs in the browser.

Is This Worth Building?

Yes, but only if you've validated the idea first. SaaS has the best business model in software (recurring revenue, high margins, compounding growth), but it also demands the most sustained effort. You're committing to months of building, then months or years of maintenance, support, and iteration.

The market is competitive but enormous. B2B SaaS is a trillion-dollar industry. You don't need a big slice. A few hundred paying customers at $30/month is $100k/year. That's life-changing money for a solo developer, and it's very achievable if you pick the right niche and execute well.

Sources

All versions, download counts, star counts, and prices below were checked on 2026-05-30.

• Next.js version (16.2.6): https://registry.npmjs.org/next/latest
• Next.js npm weekly downloads (40.1M): https://api.npmjs.org/downloads/point/last-week/next
• Next.js GitHub stars (139,595): https://github.com/vercel/next.js
• Supabase JS version (2.106.2): https://registry.npmjs.org/@supabase/supabase-js/latest
• Supabase JS npm weekly downloads (19.8M): https://api.npmjs.org/downloads/point/last-week/@supabase/supabase-js
• Supabase GitHub stars (103,193): https://github.com/supabase/supabase
• Supabase pricing (Free, Pro at $25/mo, free-tier limits): https://supabase.com/pricing
• Stripe Node version (22.2.0): https://registry.npmjs.org/stripe/latest
• Stripe Node npm weekly downloads (11.9M): https://api.npmjs.org/downloads/point/last-week/stripe
• Stripe pricing (2.9% + $0.30 per domestic card charge, no monthly fee): https://stripe.com/pricing
• Stripe webhook signature verification: https://docs.stripe.com/webhooks/signature
• Sentry Next.js SDK version (10.55.0): https://registry.npmjs.org/@sentry/nextjs/latest
• Sentry pricing (Developer free 5,000 errors/mo, Team $26/mo): https://sentry.io/pricing/
• Vercel pricing (Hobby free, Pro $20/user/mo): https://vercel.com/pricing
• Django version (6.0.5): https://pypi.org/pypi/Django/json
• Django GitHub stars (87,583): https://github.com/django/django
• Supabase Row Level Security docs: https://supabase.com/docs/guides/database/postgres/row-level-security
• Next.js Route Handler docs: https://nextjs.org/docs/app/api-reference/file-conventions/route