I build things meant
to last longer than one quarter.
“I'm Mateusz Kornaś, and I've been building for the web for eighteen years — since the afternoon I wrote my first website in Windows Notepad and couldn't stop.
Most of those years were spent inside serious systems. Front-end and design for online banking. Two years in London on e-commerce platforms for British retailers. Lottery management software in the US. Then years as a senior engineer — and team lead — on factory software for one of the world's largest pharmaceutical companies.
Along the way I stopped being “just” front-end. Node, .NET, Spring, PHP, Postgres, Mongo. CI/CD, Docker, backend clusters. Whole company networks — pfSense, Ubiquiti, POS systems, cameras, NAS, on-premise hosting. A long detour through cybersecurity and ethical hacking that still shapes how I read every line of code.
Today I run that whole range solo, for businesses that want one person accountable for the result. A landing page, an online shop, a mobile app, a full SaaS like Gastronaut — plus the infrastructure and AI automation underneath. I can take a business from “we need something online” to a product running in production.
I work alone on purpose. Briefs come to me, decisions are made by me, and I'm the one still here when something needs fixing two years later. No account managers, no briefs about briefs.
Off the keyboard I'm a dad and a martial-arts enthusiast who reads too much about the Roman Empire. I draw to think — and I've always treated building as something closer to a discipline than a job.
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
Went fully solo and started shipping my own products — Gastronaut (restaurant SaaS) and Wishy — alongside client work, end to end.
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.
The stack is a tool, not a religion.
Eighteen years means I've worked nearly every layer. I pick for the problem, not the trend: