Jan Slusarczyk

Web Developer

25 years in web development. Still shipping modern code.

I started building websites in 1999. The web has changed completely since then — and so have I. While many developers settle into comfortable routines, I've made it a point to stay on the cutting edge. Every year brings new tools, new frameworks, new possibilities. I find that exciting, not exhausting.

Based in Italy, I work as a freelance developer and consultant for clients across Europe. I'm also the co-founder and CTO of babyboom.pl — one of Poland's leading parenting portals, serving 700,000 unique visitors every month.

What I specialize in:

TYPO3 Development & Maintenance I currently manage over 20 TYPO3 installations. From legacy upgrades (yes, even those ancient 4.x systems) to fresh v13 deployments with headless architecture — I've seen it all. I handle migrations, performance optimization, custom extension development, and long-term maintenance with proper CI/CD pipelines.

Modern Frontend Development Vue.js, Nuxt, Tailwind CSS — these are my daily tools. I build responsive, accessible interfaces with smooth animations and transitions using GSAP. Whether it's a traditional server-rendered site or a fully headless PWA, I deliver frontends that are fast, beautiful, and maintainable.

Interactive & Data-Driven Interfaces Map-based interfaces, data visualizations, real-time dashboards — I love building things that make complex information accessible. If your project needs custom interactive elements that go beyond standard templates, that's where I thrive.

API Integrations & Backend Work From payment gateways to CRM systems, from social media APIs to custom data synchronization — I've integrated dozens of external services into web applications. I understand both sides of the API: building them and consuming them.

Server Management & DevOps I manage VPS infrastructure, handle deployments, configure caching layers, and optimize server performance. I believe a developer should understand the full stack — from the database to the CDN.

Technical SEO & Performance Page speed isn't just about user experience — it's about business results. I optimize Core Web Vitals, implement proper structured data, and ensure sites are built for both users and search engines.

Why clients stay with me:

Most of my clients have been working with me for years. Some for over a decade. That's not an accident.

I don't just complete tasks — I understand business context. I communicate clearly. I deliver on time. When something unexpected comes up, I solve it instead of making excuses. I treat client projects like my own.

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

Looking for something non-standard?

The projects I enjoy most are the ones that don't fit neatly into templates. Complex migrations. Unusual integrations. Performance problems everyone else gave up on. Technical debt that's been accumulating for years.

If you have a challenging web project and need someone who's seen it all — get in touch.

Susu Water

Scroll based animations with rotoscoping bottles more

Animation Frontend TailwindCss Video

Jewish Effective Giving

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

Animation TailwindCss Typo3 Typo3 Extensions

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

Otis Lift Configurator

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

Nuxt TailwindCss Typescript/Node API Vue

Melior

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

Frontend TailwindCss Typo3 Vue

MyCompanyPolska.pl

Frontend styling using Tailwind CSS, convert jQuery functions to 'vanilla' typescript. more

Kurkumik.pl

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

Bulma Nuxt Typescript/Node API Vue

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

BabyBoom.pl

My main everyday work - hugely popular parenting website built with typo3 and modern frontend. more

TailwindCss Typescript/Node API Typo3 Typo3 Extensions Vue