AI-native software studio

We build ERP, CRM and internal tools in weeks — not quarters

One system instead of spreadsheets, disconnected tools and manual work.

Jack Tomaszewski, founder of Full Stack House

Work directly with Jack
Founder & Senior Engineer

Talk to JackSee our results →
An animation: business logic, UX/UI, frontend, integrations, backend, infrastructure and testing assemble into one finished house.

Does this sound familiar?

Your organisation has become too complex for disconnected tools

  1. 01Manual work

    Manual work is holding your operation together

    Important information lives across files, emails, spreadsheets and individual employees.

  2. 02Disconnected systems

    Disconnected systems create extra work

    Sales, production, inventory and accounting still require manual data transfers.

  3. 03Software fit

    Software that doesn't fit slows your team down

    You pay for features you do not need, while your team still adapts its process to the software.

  4. 04Delivery

    Custom development takes too long and costs too much

    Traditional custom development often means large teams, long discovery phases and months before the first useful release.

We turn disconnected tools and manual processes into one system built around how your company operates.

Services

Software built around your actual business

See all services and fixed-price offers →

Open source

Start from a proven foundation. Tailor what makes your business unique.

Launch on a production-tested open-source foundation. Customize workflows, integrations and logic for your business.

Explore Open Mercato →

Typical project split

80% — proven open source
Your 20%
  • 80%
    Proven open-source foundationCore capabilities are built, tested and maintained.
  • 20%
    Built around your operationWorkflows, integrations and rules tailored to you.

How we work

No handoffs. Just ownership.

One senior owner holds the full context from first conversation to production.

See how we work →

Selected results

Real systems solving real business problems

CommerceOrder management
Groomershop

One order cockpit for a pet-supplies store doing tens of thousands of orders a month — mirrored live from a desktop ERP with no API.

Groomershop — One order cockpit for a high-volume store
FintechTravel / eSIM
Covo

The backend and mobile apps behind a travel eSIM wallet — an append-only multi-currency ledger, family pooling, instant top-ups.

Covo — An eSIM wallet for international travelers
EdTechAI
Edube

Building an AI-native learning platform for Polish matura students — a Feynman-style AI tutor with real-time voice, adaptive learning paths and LLM-generated practice.

Edube — An AI tutor that teaches understanding, not answers

See all 15 results →

From clients

What they said

I came with a teaching philosophy, not a spec. They turned it into a working AI tutor — voice mode and knowledge tree included — faster than I could have written the second draft.

Damian StrzelczykFounder, Edube · co-founder of Tutlo, 75,000+ students, PLN 220M/yr

Every other quote we got started with a rewrite. They worked inside the twenty-year-old system instead, replacing it page by page, in production.

Dr David MelamedFounder, MyEvaluations · most US health universities

What stood out was how quickly they understood both the product and the reasoning behind our requirements. We could give high-level feedback and trust them to work through the details and come back with a thoughtful solution.

Ellen CassidyFounder, Loophole · #1 Amazon bestselling author

Orders sat in Subiekt — our Windows ERP from 2003 — with no API, and I kept being told it couldn't be connected. They connected it: tens of thousands of orders a month now land in one place, seconds behind the ERP.

Maciej TomaszewskiFounder, Groomershop · tens of thousands of orders/month

We had a wallet idea and a carrier contract. They built everything in between — the apps, the billing, and the back office my own team works in every day.

Talha ErolFounder, Covo · eSIM wallet live in 190+ countries

FAQ

Questions you're probably asking

01Do I own the code and infrastructure?
Yes, fully. No lock-in, no proprietary runtime, no subscription required to run what we build. You get the repository, the deploy config, and the keys.
02Can you start with one workflow and expand later?
That's the default. We scope the first workflow into a fixed stage, ship it, and expand only once it works. Each stage is a fixed price and a working deliverable — no big upfront commitment.
03Can you integrate with the systems we already use?
Yes. Most of what we build connects to what you already run — accounting, ERP, e-commerce, email, spreadsheets. We integrate first and replace only what genuinely needs replacing.
04Is AI-built code reliable?
Yes — when it's built with the right process. Every feature ships with automated end-to-end tests, including UI, plus demo data. Quality is gated in CI before anything reaches production, and you can run the tests yourself on day one.
05Who maintains the software after launch?
You can — it's documented, tested, and written in mainstream TypeScript without exotic frameworks. Or we can, on a retainer. Your choice; you're never stuck with us.
06Does Jack personally lead every project?
Yes. Jack scopes the work, owns the architecture and signs off on what ships. AI agents and the team do the volume; the judgment stays with one senior engineer who holds the full context.

Founder-led delivery

Talk directly with the person who builds your system

Show Jack your current workflow, system or even a rough sketch. In a 30-minute conversation, you'll identify what can be automated, integrated or rebuilt.

Book a call with JackSend a message

30 minutes · directly with Jack · no sales deck · no commitment

Jack TomaszewskiCEO20+ years shipping production software

Jack Tomaszewski, founder of Full Stack House