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Mario O. is a Senior Software Engineer at PAYBACK since February 2015, specializing in architecting and implementing mobile payment solutions and mobile app architecture for a large user base. Key contributions include the design of offline/online payment systems, implementation of NFC protocols, Android security mechanisms, devops maintenance, and the application of machine learning models. Prior to this role, Mario O. was involved in mobile malware analysis and security research at the Faculty of Organization and Informatics from July 2009 to December 2018. Mario O. holds a Master of Informatics and a Bachelor of Science in Informatics from the University of Zagreb, augmenting a solid educational foundation with practical experience in security and software development.