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.
Company sites, sales landers, portfolios. With or without CMS. Conversion-tuned and basic SEO included.
Stores built on the right tools for the scale — from Shopify for boutiques to custom checkouts for non-standard sales models.
Admin panels, dashboards, internal tools, full SaaS platforms. From the database up to the interface.
Cross-platform (React Native) or natively per platform. Including App Store / Google Play submission.
Chatbots, sales assistants, LLM integrations (OpenAI, Claude), MCP servers, agents that automate company workflows (n8n, Make), middleware that wires several systems into one. No hype — just tools that genuinely shorten support time and unload your team.
CI/CD, Docker, backend clusters, on-premise hosting. Whole company networks (pfSense, Ubiquiti), POS, camera and NAS integration. From a single server to a complete on-site setup you can actually maintain afterwards.
Code reviews, security audits, performance optimisation. A background in cybersecurity and ethical hacking lets me look at a system the way an attacker would — before someone else does.
Technical SEO, content, Google Business, maps. Your site is meant to be found, not only built.
A few things I've built.
Restaurant · Customer site
A premium brand going back to 2008 — with its online sales in someone else's hands. Aggregators took ~25% of every order, the rest came in by phone across three numbers, and the restaurant didn't know its own customers.
Jeweller · E-commerce
A family jewellery house going back to 1877 — four generations of craft, one-of-a-kind pieces — but sales limited to two physical salons and an online presence that didn't match 145 years of history.
Own product · Restaurant SaaS
Small restaurants either give 20-30% to aggregators or have no online ordering at all. A third option barely exists.
Own product · Mobile
Gifting 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.