My Projects

Companies and projects in which I have been or am currently involved:

• kicket.com - a leading ticketing platform in Poland - initially, I was a systems architect, and now I am also the company's CTO.
• WALCZAK - wooden floors - wooden floors - co-owner, responsible for IT solutions in the company and the ISO 9001 quality management system.
• XChange - an open-source Java library unifying communication with multiple cryptocurrency exchanges - I am one of the project's maintainers.
• resilience4j - an open-source Java library that helps ensure fault tolerance - I occasionally contribute to it.
• Allegro - I worked there as a Java expert in teams responsible for rewriting a PHP/Oracle monolith to a microservice architecture based mainly on Java and NoSQL databases.
• Qcadoo MES - an open-source system for production management in SMEs - I was the community manager and systems analyst in this project.
• PSIwms - a system for managing/controlling large warehouses - I worked there as a programmer customizing the system for implementations in Poland.
• PDF decorator - a tool for applying backgrounds and stamps to PDF files - a small pet project from the time of experimenting with JavaFX.
• Book "OPEN SOURCE Projects - ways to organize and finance them" - my master's thesis, which eventually turned into a book.