Looking for a SaaS development company in Poland that turns your idea into a product people actually pay for, instead of a 200-page spec and a six-month invoice? That is exactly what I do. I am a senior developer based in Warsaw, working with founders across Poland and the EU remotely, and I ship revenue-ready SaaS MVPs on a modern stack in weeks, not quarters. One person owns the whole build, you own the code, and you can start charging users the day it goes live.
Most founders do not fail because the idea was wrong. They fail because they spent 40,000 zl and four months building features nobody asked for, ran out of runway, and never put a real product in front of a real customer. My whole job is to stop that from happening to you.
What you actually get
When you build a SaaS MVP with me, you do not get a slide deck. You get a working web app in production that does one thing well and can take money. A typical first version includes:
- One core flow, done properly. The single job your product exists to do, built so a real user can complete it and come back.
- Authentication. Email plus Google sign-in, password reset, protected routes. Standard, secure, done.
- Billing that works. Stripe checkout, subscriptions, plans, trials, and the webhook plumbing so upgrades and cancellations just work.
- Multi-tenancy. Separate accounts, teams, and data isolation from day one, so you are not rebuilding the foundation the moment a company signs up.
- A dashboard. The screen where your user gets value, plus an admin view where you see what is happening.
- An API and a real database. Postgres for your data, clean endpoints for anything you connect later.
The stack is modern and boring in the good way: Next.js and TypeScript on the front and the API layer, Postgres (Supabase) for data and auth, Stripe for money, deployed on Vercel. It is fast, it ranks, and it scales from your first 10 users to your first 10,000 without a rewrite. Everything is GDPR/RODO ready with EU hosting, and yes, you get a faktura VAT so the whole thing goes straight into your company costs.
How I work, and why one senior beats a team of five
An MVP does not need a project manager, an account rep, and three juniors passing tickets around. It needs one experienced developer who understands your business and ships. Here is the process:
- Discovery call (free). 30 to 45 minutes. We cut your idea down to the one hypothesis worth testing and the single flow that proves it.
- Fixed scope and fixed quote within 24 hours. You get a written feature list, a timeline, and one price. No hourly meter that turns the final bill into a surprise.
- You see it every week. A live preview URL from week one. You click the real thing, not a Figma mockup, and we correct course before it is expensive to change.
- Launch. Deployed to production under your accounts, code handed over, ready to onboard paying users.
Because I run no office and no sales floor, almost your entire budget goes into the actual product. I am in the EU timezone, so we talk during your working day, not at midnight. And when the MVP proves itself, I stay on to build v2 - but that is your choice, never a lock-in.
Do you own the code? Yes. All of it.
This is the question that separates a real hire-a-SaaS-developer deal from an agency trap. You own the source code, the repository, the Vercel and Stripe accounts, the database, everything, in your name, in writing, before we start. No black box, no hostage hosting, no "we host it for you so you cannot leave." If one day you want to bring the project in-house or hand it to another team, the handover is a git push, not a negotiation.
Proof: I ship production, not promises
VisionAir (Warsaw). A drone operator whose old site loaded in 4 seconds and ranked for nothing. I rebuilt it on Next.js 15, TypeScript, and Vercel, with a lead pipeline that hits the owner's Telegram in under 2 seconds. Result: sub-1-second load on every page and visitor-to-lead conversion up from 0.8% to 4.2%. Same stack, same speed of delivery I bring to a SaaS build. See the full VisionAir case study.
CRM Bot (B2B, under NDA). A custom product for a company drowning in 50-80 leads a day. I built an AI agent with an admin dashboard, multi-channel messaging, six-criteria qualification, and a live pipeline where a human can step in at any point. It replaced the first-touch sales manager and lifted qualified-lead conversion by 31%. That is the multi-tenant dashboard plus API plus billing-grade reliability a SaaS needs, already shipped.
What a SaaS MVP costs in Poland
Honest ranges for a senior building solo, PLN and EUR, no VAT:
| Package | What is inside | Timeline | Price |
|---|---|---|---|
| Validation MVP | One core flow, auth, Postgres, basic dashboard, Stripe checkout | 3 - 5 weeks | 13,000 - 21,000 zl / €3,000 - €5,000 |
| Standard SaaS MVP | Adds subscriptions and billing, multi-tenancy, admin panel, API, user roles | 6 - 8 weeks | 21,000 - 38,000 zl / €5,000 - €9,000 |
| Scale-ready build | Adds integrations, analytics, team accounts, custom business logic | 8 - 12 weeks | from 42,000 zl / from €10,000 |
For contrast: the median agency quote for the same standard SaaS MVP runs well over $100,000, because half those hours pay for coordination, overhead, and a sales team. One senior who owns the whole stack gives you the same launched product for a fraction of it. That is the actual trade you are choosing between.
Choosing a SaaS development company in Poland: freelancer, agency, or team?
- A freelancer (me) wins when you have a clear idea and want it in market fast, at a sane price, talking straight to the person writing the code. The honest downside: one person is one person. I manage that with a contract, staged payments, and everything on your accounts.
- An agency makes sense when you need many parallel workstreams - product, brand, ads, a big team - and budget is not the constraint. You pay for structure, and for a rotating cast where a junior often does the actual work.
- A nearshore team is for a funded company scaling an already-validated product with several developers at once. Overkill, and overpriced, for a first MVP whose entire point is to learn cheaply whether people want the thing.
For turning an idea into a launched SaaS in weeks, on a fixed budget, one senior is almost always the right first move. Scale the team after the market says yes.
More than the core app
The SaaS itself lives under my custom web and app development work - that is the primary build. Two things founders usually add once the product has traction:
- A companion mobile app so users get push notifications and a home-screen icon. I build those cross-platform with React Native, sharing logic with your web app. See mobile app development.
- Automation and integrations to connect your SaaS to the tools your customers already use - CRMs, payment events, onboarding emails, internal alerts. That is my business process automation work, and it is often what makes a SaaS sticky.
You do not need any of it on day one. You need one core flow that proves demand. The rest is a roadmap, and I will tell you honestly what belongs in v1 and what waits.
FAQ
How much does it cost to build a SaaS MVP? Built solo by a senior developer, a focused SaaS MVP in Poland runs roughly 13,000 to 45,000 zl, which is about €3,000 to €10,000, depending on scope. A validation build with one flow and Stripe checkout starts around €3,000; add subscriptions, multi-tenancy, and an admin panel and you are in the €5,000 to €9,000 range. Agencies quote six figures for the same thing, mostly overhead.
How long does it take to launch an MVP? A tightly scoped SaaS MVP with auth, one core flow, and billing is realistically 4 to 8 weeks with a single developer. More user roles, an admin panel, and outside integrations push it to 8 to 12 weeks. If someone promises a full SaaS in two weeks, you are getting a template that breaks the moment real users arrive.
What features should the first version include? As few as possible: authentication, the one core flow your pitch is about, and billing only if charging is the thing you are testing. Cut admin analytics, team invites, social features, and dark mode from v1. Every extra screen is a week you are not learning whether people actually want the product.
Do I own the code and the IP? Yes, completely. Source code, repository, database, and the Vercel and Stripe accounts are all in your name, confirmed in writing before we start. No lock-in, no hostage hosting. If you ever move the project elsewhere, the handover is a simple transfer, not a fight.
Can you handle payments, subscriptions, and user authentication? Yes, that is core to every SaaS I build. Stripe for checkout, subscriptions, plans, trials, and the webhooks behind them; secure auth with email and social sign-in; multi-tenant data isolation so accounts never see each other's data. It is all standard in my builds, not an expensive add-on.
Are you GDPR/RODO compliant and do you provide an invoice? Yes. EU hosting, RODO-ready data handling, cookie consent, and a data model that respects user privacy from the start. You get a proper faktura VAT for the whole project, so it goes straight into your company costs, and I work on a clear B2B contract.
Here is the real bottom line: a launched, revenue-ready SaaS MVP from a senior developer in Poland is €3,000 to €10,000 and ships in weeks, not quarters - with you owning every line of code. Every month you wait is a month you are not learning whether people will pay. Want a fixed quote and a timeline for your idea? Write me on the contact page or see my custom web and app development work, and you will have a price and a start date within 24 hours. Send it today and I will hold your slot in the queue.
