Mikalai Alimenkou is a senior delivery manager, Java tech lead, and experienced coach. An expert in Java development, scalable architecture, agile engineering practices, QA processes, and project management, he has more than 14 years of development experience, specializes in complex, distributed, scalable systems, and global company transformations. He's an active participant and speaker at many international conferences and is the founder and an independent consultant at XP Injection—a training and consulting provider. He's an organizer and founder of Selenium Camp, JEEConf, and XP Days Ukraine international conferences, as well as the Active Anonymous Developers Club (UADEVCLUB).

Nazarii Cherkas works as a solutions architect at Hazelcast—a company that develops open source projects such as Hazelcast IMDG and Hazelcast Jet. Nazarii has many years of experience of working in different positions, from Java engineer to team lead. He has been involved in various projects for different industries, from telecoms and healthcare to critical systems serving the infrastructure of one of world's biggest airlines. He holds a master's degree in computer science of the Yuriy Fedkovych Chernivtsi National University.

Tomasz Nurkiewicz is a Java champion. He had spent half of his life programming. On a daily basis, he works in the e-commerce sector. He's involved in open source, is DZone's most valuable blogger, and used to be very active on Stack Overflow. He's an author, trainer, conference speaker, technical reviewer, and runner. He claims that code that's not tested automatically is not a feature but just a rumor. He also wrote a book on RxJava.