Jan Slusarczyk

Web Developer

25 years in web development. Still shipping modern code.

I started building websites in 1999 and never stopped keeping up. Based in Italy, I work as a freelance developer for clients and agencies across Europe. I'm also co-founder and CTO of babyboom.pl — one of Poland's leading parenting portals, with 700,000+ unique visitors every month.

There are two ways I usually work with people:

1. TYPO3 — full-stack. This is my home turf. I currently maintain 20+ TYPO3 installations and have delivered 50+ large projects. Legacy upgrades (yes, even those ancient 4.x systems), fresh v13 builds with headless or Turbo, custom Extbase extension development, performance optimization, 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.

2. Frontend — for any backend. Vue, Nuxt, Tailwind CSS, GSAP, TypeScript. I drop into teams running Craft, Rails, Python, plain Node or Appwrite and build the frontend: responsive, accessible, fast, with the smooth animations and transitions that make a site feel premium. Map-based interfaces, data visualizations, scroll-driven storytelling — the non-standard stuff is where I thrive.

Also in the box: API integrations (payments, CRM, social, custom sync), VPS / DevOps and caching, and technical SEO with Core Web Vitals — because a senior developer should understand the full stack, from the database to the CDN.

Why clients stay with me:

Most of my clients have worked with me for years — some for over a decade. That's not an accident. I don't just complete tasks: I understand business context, communicate clearly, deliver on time, and when something unexpected comes up I solve it instead of making excuses. 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.

2026

BabyBoom.pl

My main everyday work since 1999 — one of Poland's most popular parenting portals (700k+ monthly visitors), built on TYPO3 with a modern frontend. more

TailwindCss Typescript/Node API Typo3 Typo3 Extensions Vue
2026

Erinnern für morgen

Frontend for a demanding Swiss federal memorial platform — video, custom-styled maps, high-performance record filtering. more

Frontend TailwindCss Animation Video Craft CMS Accessibility (a11y) Maps
2026

LiteraturSchweiz

Frontend for the Swiss literature platform — a high-performance, filterable catalogue with a bold typographic design. more

Frontend TailwindCss Animation Craft CMS
2026

Grand Digital

Full TYPO3 project for a Munich digital agency — HubSpot integration, custom extensions, Turbo rendering and technical SEO. more

Typo3 Typo3 Extensions TailwindCss Animation Frontend
2025

Bäckerfinder

Full development of a new API client syncing thousands of bakery records onto an interactive map, on TYPO3. more

Typo3 Typo3 Extensions Frontend Maps
2024

Deutsches Bäckerhandwerk

Frontend in TailwindCSS plus ongoing maintenance and upgrades for the German bakers' guild website. more

Typo3 Frontend TailwindCss
2024

Back dir deine Zukunft

Recruitment campaign site for the baking trade — frontend build plus frontend & backend maintenance since launch. more

Typo3 Frontend TailwindCss
2022

Susu Water

Scroll based animations with rotoscoping bottles more

Animation Frontend TailwindCss Video
2022

Jewish Effective Giving

Typo3 based website with bold design by Kasper Skirgajłło-Krajewski more

Animation TailwindCss Typo3 Typo3 Extensions
2022

Affinis Inverse

Frontend for a single page application built on typo3. My job was styling and javascript programming (using GSAP, custom video player and other technologies). more

Animation Frontend TailwindCss Typo3 Video
2022

Otis Lift Configurator

Internal tool for salespeople of Otis to prepare and visualise lift configurations more

Nuxt TailwindCss Typescript/Node API Vue
2022

Institute of English Studies - University of Warsaw

A WCAG (accessibility) compliant modern website for students and faculty members. more

Accessibility (a11y) Bulma Typo3 Typo3 Extensions Vue
2021

Melior

Frontend work on a large typo3 installation for Melior. Vanilla JS, Vue and TailwindCss more

Frontend TailwindCss Typo3 Vue
2021

Kurkumik.pl

e-commerce site built with Nuxt and custom typescript api backend more

Bulma Nuxt Typescript/Node API Vue