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

Covo is a travel eSIM wallet: load money once, spend it on mobile data in 190+ countries at local rates, and never lose what you don't spend. No plan to expire, no bill shock when you land.

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 is an AI-native education platform for Polish high-school students preparing for the matura — built on the philosophy that students should reach real understanding, not just receive answers.

Rebuilt a steel-tank manufacturer's sales pipeline end to end — multilingual site, instant-quote configurator, CRM, AI-drafted quotes.

Metal Zbiorniki manufactures steel tanks and pressure vessels — most of it made to order, where every enquiry used to start as free text and turn into a slow email thread. Quotes lived in a shared inbox split between the owner and one colleague, so enquiries got duplicated, follow-ups slipped, and pricing a single tank could take a day or two of digging through an Excel cost sheet and past offers.

A custom ERP for a growing metal fabricator: RFQ to invoice in one flow, replacing the spreadsheets and paper binder they'd outgrown.

A Polish metal-fabrication shop growing 15–20% a year — cutting, turning, milling, sheet-metal burning, welding and assemblies, roughly 1,500 production items and 800–900 orders a year across two to three halls and ~10 workstations. Their processes had gone corporate; their tools hadn't.

Modernized a 20-year-old C# monolith powering most US health universities — incrementally, no big-bang rewrite.

A Software-as-a-Service application powering the vast majority of health universities in the USA.

Built an international tours marketplace + operator SaaS from scratch, and advised the founders through fundraising.

Tripsomnia is a web platform that lets you book and sell local tours and tourist attractions all over the world.

An all-in-one festival platform — discover fests, plan the trip, personalize the experience — web + iOS/Android, built end to end.

FestBlast is an all-in-one platform that lets you easily find the best music fests, organize your trip and personalize your festival experience. This free web and mobile solution helps you stay connected with your friends and share your epic festival moments.

The native iOS & Android app for a hiring platform — candidate overview, team notes, powerful search.

The mobile application for Android & iOS includes almost all of Recruitee's web-panel functionality:

A court-booking mobile app built in one month — and still rated 4.93/5 with 1,000+ reviews five years on.

A mobile app for booking sports courts online and managing your reservations.

A travel-social app to find nearby activities, meet travellers and set up meetups — responsive web + native apps.

What makes a trip abroad truly awesome? Not the place or the activities, but the moments when you spontaneously meet other like-minded travellers and experience the city together. That's what Gulliver is all about.

A Polish social job aggregator — 'LinkedIn before LinkedIn' — tuned for ~40M monthly page views.

TerazZaraz is the best way to find a job using your contact network — thousands of job offers in one place.

Moved specialist dictionary publishing online — public portal, reseller panel, and a browser-based editor — built from scratch.

Slowniki-Pro is a lexicographical project that brings all general and specialist dictionaries into one online place.