Károly Nyisztor is a professional software engineer, instructor, and author. So far, he has inspired over 150,000 students worldwide. As an instructor, he aims to share his more than 25 years of software development expertise and change the lives of students throughout the world. He's passionate about helping people reveal hidden talents and guide them into the world of startups and programming. Karoly has worked for companies like Apple, Siemens, and SAP. As a software architect, he has designed and built several enterprise frameworks. He currently holds twelve patents related to inventions in the field of mobile computing. He has worked with various technologies and programming languages, including x86 Assembly, C, C++, Java, Objective-C, Swift, and Python. Karoly has built several successful iOS apps and games that Apple has featured as ”New and Noteworthy,” ”App of the Month,” and “Best Travel Apps.” After 18 years, he left the corporate world to start his own business. He is the founder of LEAKKA, a software development and tech consulting company. Since 2016, he has been fully committed to teaching. Karoly teaches Software Architecture, Object-Oriented Programming and Design, Software Security, iOS Programming, Machine Learning, Swift and Python Programming, and UML.