From the databaseto the pixel —I build all of it.
I'm Mateusz Kornaś — a full-stack engineer with 18 years behind banking, pharma and lottery platforms. Now that depth goes straight into your project: site, shop, app, SaaS — plus the servers and network underneath. One person, from first email to production.
Eighteen years is the short version.
Long enough to have built almost everything a business can put online — and to know what each of those things actually costs to keep alive.
Code that shipped where breaking isn't an option.
Eighteen years across banking, pharma, lottery and high-traffic retail taught me to build for uptime, audits and scale — not just for the demo.
A complete digital presence.
You don't assemble a web studio, an app shop, an SEO freelancer, a sysadmin and an AI consultant. I cover all of it — one person, one language, one conversation.
A few things I've built.
Sushi Zushi
Restaurant · Customer siteA restaurant fully dependent on aggregators, losing 25% per order and with no access to its own customer base.
Gastronaut
Own product · Restaurant SaaSSmall restaurants either give 20-30% to aggregators or have no online ordering at all. A third option barely exists.
Wishy
Own product · MobileGifting is guesswork. Wishlists scattered across chats, screenshots and memory — and someone still buys the same thing twice.
I don't just design — I build and run my own products in production.
Which means I know what SLAs, server bills, retention and two-year-old code actually feel like. Your project isn't my first rodeo.
Gastronaut
Own productSmall restaurants either give 20-30% to aggregators or have no online ordering at all. A third option barely exists.
Wishy
Own productGifting is guesswork. Wishlists scattered across chats, screenshots and memory — and someone still buys the same thing twice.
Short, concrete, no agency theatre.
Call
30 minutes, free. We leave with a rough quote, a timeline and whether it makes sense at all.
Brief & quote
Short document, final price, schedule. No theatre, one iteration.
Build
Weekly visible progress on staging. Full transparency — you see what's being built.
Launch & care
Go-live, monitoring, two months of free fixes. Ongoing maintenance on retainer.
Project on your desk?
Two sentences about what you need is enough. I usually reply the same day.