I'm Jan Ślusarczyk — a full-stack web developer who started building websites in 1999 and never stopped keeping up. I came to code from journalism, and it still shows: I'm as comfortable explaining a technical trade-off to a stakeholder as I am making it in the codebase.

I'm based in Italy and work with clients and agencies across Europe, usually solo or as part of a small, senior team. I'm also co-founder and CTO of babyboom.pl — one of Poland's leading parenting portals, running on TYPO3 since 1999 with 700,000+ unique visitors a month. So when I talk about high-traffic sites in production, I mean one I'm responsible for every day.

Over 25 years and 50+ large projects, I've settled into two things I do better than anything else:

Creative frontend. Demanding, design-led work — scroll-driven storytelling, animation, interactive maps, data visualization, and the kind of polish that makes a site feel premium. Vue, Nuxt, Tailwind CSS, GSAP, TypeScript, on top of any backend: Craft, Ruby on Rails, Python, plain Node or Appwrite. The non-standard stuff that pushes the browser is where I have the most fun.

TYPO3 — full-stack. Deep platform expertise most freelancers can't offer. I currently maintain 20+ TYPO3 installations and have delivered dozens of large builds: legacy upgrades (yes, even those ancient 4.x systems), fresh v13 deployments with headless or Turbo, custom Extbase extensions, performance optimization, complex migrations, and long-term maintenance with proper CI/CD. If you've inherited a TYPO3 site nobody wants to touch, that's my favourite kind of project.

Underneath both: API integrations, VPS / DevOps and caching, and technical SEO with Core Web Vitals — because a senior developer should understand the whole stack, from the database to the CDN.

Maintenance & retainer. Ongoing care for a TYPO3 site — updates, security, performance, small features, and someone who actually knows your codebase. Most of my clients are here, some for over a decade.

Migrations & upgrades. Moving an old TYPO3 to a current, supported version — or off something else entirely. Planned, staged, and done without taking your site down.

Project builds. A new site or application from scratch — full-stack on TYPO3, or as the frontend on your stack.

Frontend contracts. Drop-in senior frontend help for agencies and product teams who have the backend covered but need the interface done right.

• 25 years building for the web — continuously, since 1999
• 50+ large TYPO3 projects delivered
• 20+ TYPO3 installations under active maintenance
• 700,000+ monthly visitors on babyboom.pl, smooth in production
• client relationships measured in years and decades, not projects

I'm not the cheapest option, and I'm not trying to be. If you need reliable, senior-level expertise and someone who'll be there for the long haul — let's talk.

This website runs on TYPO3 13.4 with Turbo (via Topwire) for smooth, SPA-like navigation without the complexity of a JavaScript framework. Page transitions feel instant while maintaining full server-side rendering and SEO benefits.

Tech stack:

• TYPO3 13.4 — robust content management with Fluid templates
• Turbo Drive & Frames — seamless navigation, partial page updates
• Tailwind CSS 4 — utility-first styling compiled with Vite
• GSAP — scroll-triggered animations and page transitions
• Swiper.js — touch-friendly carousels for portfolio items

The portfolio section uses a custom TYPO3 extension with Extbase/Fluid. Assets are bundled with Vite for fast development and optimized production builds.

I also build headless systems — the previous version of this site used TYPO3 headless with Nuxt.js. Whether you need a traditional CMS, a decoupled frontend, or a full headless architecture with React/Vue/Nuxt, I can design and implement the right solution for your project.