An online tipping competition for sports fans where users create seasons, leagues and rounds, predict match results and compete in leaderboards, with automatic scoring, achievements and notifications.
The backend is built on Node.js/Express with Sequelize ORM over MariaDB, the frontend on server-rendered EJS templates with custom CSS. Authentication is session-based with bcrypt hashing, e-mails are sent via Resend. The application runs on a VPS (Ubuntu, nginx, PM2, Let's Encrypt) and is prepared for multilingual support via i18next. Quality is verified by end-to-end tests in Playwright across desktop, tablet and mobile viewports.

This project is a web-based platform designed to help children improve their pronunciation through interactive exercises. The application uses speech recognition via the Web Speech API to analyze spoken words and provide immediate feedback. The platform includes multiple levels and types of exercises, making it suitable for gradual learning and long-term use.
During development, I worked mainly with JavaScript, HTML and CSS, focusing on integrating speech recognition and handling real-time input. The project is a continuation of my bachelor thesis and represents my most complex work so far.

A custom-built Slovak tech media platform replacing a legacy WordPress site — articles, hardware reviews, product rankings, comments, user accounts and messaging, all managed through a self-made block-based CMS.
Built on Node.js/Express with Knex.js over MariaDB and server-rendered EJS templates with custom CSS. Includes Sharp-based image processing, session auth with bcrypt, CSRF/Helmet security, a full SEO layer (JSON-LD, sitemap, Open Graph), GDPR consent and a banner system. Deployed on an Ubuntu VPS with PM2 and Git-based deployment with database migrations.

This project serves as a collection of websites I have created during my work as a freelance developer. It mainly includes static websites built with HTML, CSS and JavaScript.
I focused on usability and simplicity, ensuring that each website is easy to navigate and visually consistent. The portfolio represents my early development experience and shows the progression of my skills over time.

This project was developed as part of my bachelor thesis and focuses on helping children with speech therapy through a simple interactive game. The application was built using Electron.
I implemented basic game mechanics together with speech-related features, combining HTML, CSS and JavaScript into a functional application.

This project contains a collection of simple games developed in the C programming language as part of my learning process. The goal was to understand fundamental programming concepts such as variables, memory management, arrays and pointers.