Krešimir Sikulin, ing. Informatics, born in Zagreb. Since his early youth, he is interested in electronics, especially digital circuits. He graduated Ruđer Bošković High School, computer course, in 1992 with his graduation work - a school bell based on the Z80 microprocessor. He spent several years working as a business owner or employed in the IT sector in Croatia and the Netherlands. In 2001 he completed the Informatics Management course at the Zagreb Polytechnic University. In 2003, he discovered love of knowledge transfer and started working as a CCNA instructor in parallel with "daytime" jobs in the profession. In addition to network and lecture methods, he is interested in IoT, Blockchain technology and startup culture