Marczelloo
Full-Stack Developer | Next.js & Node.js
Sosnowiec, Poland • Open to internships & junior opportunities
Marczelloo
About Me
I'm a full-stack developer currently studying at University of Silesia in Katowice, with over 5 years of programming experience and INF.03, INF.04 certifications. My journey started with a technical programming education and grew through self-taught exploration and hands-on projects.
I enjoy building web applications and bots, primarily working with the Next.js/T3 stack. While I'm comfortable across the full stack, I love switching between different technologies - whether it's C++ or exploring game development. The potential to create something useful and the satisfaction of seeing it come to life is what drives me.
Currently, I'm focused on deepening my expertise in Next.js and modern web technologies, while staying open to diverse opportunities in full-stack development.
Education & Certifications
- •University of Silesia in Katowice - Computer Science
- •Technical School - Computer Programming
- •INF.03 - Web Application Development & DB Admin
- •INF.04 - Software Development & App Design
Work Experience
Software Development Intern — Hurtopony
May 2023 • Sosnowiec, PolandTech: PHP, HTML/CSS, MySQL- Developed a PHP-based reporting system that generated operational and logistics reports using real company data
- Designed and optimized MySQL queries to analyze order, delivery, and inventory datasets
- Created internal calculation tools, including a tire replacement calculator and delivery cost calculator
- Improved and refactored existing internal scripts, increasing maintainability and reliability
- Collaborated with staff to adapt reporting tools to daily business needs and workflow requirements
Full-Stack Intern — RecodeIT
May 2024 • Katowice, PolandTech: Next.js, TypeScript, T3 Stack, Tailwind, PostgreSQL, Drizzle ORM- Built and expanded full-stack features using the T3 Stack as part of my first production-oriented project with this technology
- Extended an internal employee management panel by enhancing the company’s leave and holiday management system
- Implemented responsive UI components and improved existing user flows using Tailwind CSS
- Collaborated with developers during code reviews to maintain high code quality and consistency
- Supported deployment workflows and participated in monitoring application performance
- Gained hands-on experience with full-stack architecture, database schema design, and integrating backend logic with modern frontend frameworks
Full-Stack Developer (Contract) — RecodeIT · D9 Space
2024 • Katowice, PolandTech: PHP, WordPress (Custom Plugins & Backend Logic)- Worked as a contract full-stack developer at RecodeIT on the reservation system for d9space.com.
- Designed and implemented the multi-step booking flow (date, space, layout, features, final submission).
- Integrated the module with the client’s existing WordPress setup and admin tooling.
- Implemented backend logic for bookings, availability and data validation.
- Prepared an administration interface for managing bookings and reservations.
- Tailored the solution to specific business requirements and workflows.
View live reservation system
My Projects
NeoBeat Buddy
A high-performance Discord music bot built with Discord.js, Lavalink and Poru — features slash-only controls, live equaliser presets, queue management, adaptive autoplay and a Docker-ready production stack.
BookHaven
A full-stack online bookstore built with Node.js, Express and MongoDB. Features book browsing, multi-volume management, secure checkout logic and a clean MVC-style backend designed for easy expansion. Initially created as one of my earlier projects, and recently improved with new features and responsive design.
Contact
- moskwamarcel@gmail.com
- marczelloo