Yes, I have a blog too.
I write down things worth keeping outside the editor.
Bartosz Stefaniak
Iturnideasintowebsites and apps.
I help shape what they should do, design the interface, and build the systems behind it. I can take on the whole project or a specific part.
01 / Profile
Who I am and what I work on.
A good product isn't the interface you see first. It's the data model, the API contract, and the edge cases resolved long before launch. I carry that discipline through the whole stack, back end to pixel, so what ships holds up under real use: clarity, not hype.
02 / Services
What I can build or improve
Bring me a new idea or an app you already use. We’ll work out what needs building, changing, or connecting.
01Business websites
A website that makes your offer clear.
I plan and design the site, then build it. I organize your offer, key information, and contact details so visitors can understand what you do and how to get in touch.
02Apps and dashboards
An app for your day-to-day work.
A customer dashboard, order and document workflows, or tools for your team. We’ll define who will use it and what they need to do. Then I’ll design and build the app.
03Stores and integrations
An online store connected to your business.
I build online stores and connect them to payments, inventory, shipping, or accounting. This lets data move between systems without manual re-entry.
04App development
New features and fixes for your existing app.
I can join an existing project to add features, simplify workflows, improve performance, and make the code easier to develop further.
03 / Stack & skills
My toolkit, from interface design to a working application.
Frontend
Next.js · React · TypeScript · JavaScript · Tailwind CSS
Backend
Node.js · NestJS · Express · Multi-tenant systems · Real-time features
Data
PostgreSQL · Prisma · Redis · SQLite
Integrations
External APIs · Payments · Inventory · Notifications
Delivery
AWS · Docker · Linux · GitHub Actions · CI/CD
Product
Requirements · MVP scope · Application architecture · User flows
Design
UI design · Responsive interfaces · Graphic design · Visual identity
Quality
Playwright · End-to-end testing · Performance · Accessibility
Prototypes
Own products · AI agents · n8n · Development automation
04 / Selected work
Selected work
4+ years across platforms, commerce, and interface.
05 / Shorts
Short notes on tools, patterns, and shipping.
Practical observations from building web products—each one readable in a few minutes.
00 / In progress
New notes are being prepared.
The first short notes will appear here soon.