Grzegorz Kastelik is an experienced Frontend Web Developer currently working at Grupa Pracuj and holds the position of CTO at ScrumSoft since March 2022. Previous roles include Twórca and Programista specializing in Laravel, PHP, and Vue.js at Generator Umów, and Programista React and C# at Euvic. Grzegorz is also the Założyciel and Programista for Centrum Zarządzania Klubem, focused on creating a comprehensive platform for sports clubs and schools. Experience extends to programming in PHP, JS, and Laravel at Pozytywna Strona and development in Laravel at GO2SPORT.net. Grzegorz Kastelik holds a Master's degree and an Engineer's degree in Informatyka from Uniwersytet Bielsko-Bialski.