One person accountable forthe result.
“I'm Mateusz Kornaś. I've been building websites, shops and apps for eighteen years — since the afternoon I wrote my first site in Windows Notepad and couldn't stop.
Most of that time was spent where a mistake is expensive: online banking, e-commerce for British retailers in London, lottery systems in the US, and factory software for one of the world's largest pharmaceutical companies — as a senior engineer and team lead.
Today that experience works for smaller businesses. I do the whole thing myself: design, the site or app, the server, security and AI automation. I also run my own products — Gastronaut, AZ Widgets and Wishy — so I know what it costs to keep something alive that people use every day.
I work alone on purpose. You talk to me, I make the decisions, and I'm the one still here when something needs fixing two years later. Off the keyboard I'm a dad, I train martial arts and I read too much about the Roman Empire.
What you get that you usually don't.
You work with a person, not a process.
Briefs come to me. Questions come to me. A critical bug at 11pm also comes to me. One head, one accountability.
Not just design — code that runs.
Every project leaves my desk as a working product — not a Figma file to be handed to someone else.
Margin you don't pay to overhead.
No office to feed, no sales team to commission. Your money goes into hours spent on the project.
I run my own products too.
I know what support, retention and downtime really cost. You design differently when you're the one keeping the thing alive.
From Notepad to products in production.
Eighteen years, abridged — the industries where the code simply had to work.
- 2007
First lines of code
First website written in Windows Notepad, and the start of freelancing. The web has been my through-line ever since.
- 2010
Global banking
Front-end and design for online banking systems at one of Europe's biggest tech hubs — landing pages, internal CMS, jQuery mini-apps.
- 2015
London e-commerce
Two years in London delivering e-commerce front-ends on Salesforce/Demandware and Angular for British retail brands.
- 2017
US lottery
Senior front-end on lottery management systems — large Angular platforms, cross-device, performance-critical.
- 2020
Big pharma
Senior engineer, then team lead, on factory software for a major US pharma company — Angular front-end, .NET backend, a custom UI kit.
- 2024
Own products
My own products — Gastronaut (restaurant SaaS), AZ Widgets and Wishy — alongside client work, run end to end.
- 2026
Open source
Released mk-kit — an open-source library of 165+ Angular components — and the seven self-hosted apps at mkapps.dev built on it.
The stack is a tool, not a religion.
If these names mean nothing to you, that's fine — you don't need to know them. What matters is that I pick them for your problem, not the other way round.