Gazihan Alankus holds a PhD in computer science from Washington University in St. Louis. Currently, he is an assistant professor at the Izmir University of Economics in Turkey. He teaches and conducts research on game development, mobile application development, and human-computer interaction. He is a Google developer expert in Dart and develops Flutter applications with his students in his company Gbot, which he founded in 2019. Rogrio Theodoro de Brito has a bachelor's degree in computer science and a master's degree in computational biology, both from the University of So Paulo, Brazil. Academically, he is a free/open source software (FOSS) enthusiast and teaches various subjects in computer science and IT at the Mackenzie Presbyterian University in So Paulo, Brazil. He was the technical reviewer of Packt's edX E-Learning Course Marketing. After completing his master's degree, he started his role as an academic instructor and has been working with many languages, such as C, C++, Java, C, Perl, and Python. He writes, co-writes, and maintains a number of projects with two of the most prominent learning platforms, coursera-dl and edx-dl, and is dedicated to helping users of Massive Open Online Courses (MOOCs) download materials for their study from MOOC platforms. He is very excited by using the Java language to build Android applications. Basheer Ahamed Fazal works as a technical architect at a renowned Software as a Service-based product company in India. He had advanced his career with technology organizations such as Cognizant, Symantec, HID Global, and Ooyala. He has seasoned his programming and algorithmic abilities by solving complex problems around agile product development, including those to do with microservices, Amazon Web Services, Google Cloud-based architectures, application security, and big data- and AI- driven initiatives. Apart from his technical career, he has emerged as a professional trainer and has conducted various training sessions on Java, Python, application security, machine learning, and more. He holds a bachelor's degree in electronics and communication engineering from Anna University, Chennai, and has a Scrum Master Certification from Scrum Alliance. Vinicius Isola started programming back in 1999 using Macromedia Flash and ActionScript. In 2005, he took the Java Certification and specialized in building web and enterprise applications. Always working on all parts of the stack, JavaScript and web technologies have always been present in his many job roles and the companies he has worked for. In his free time, he likes to work on open-source projects and mentor new developers. Miles Obare leads the data engineering team at Betika, a Nairobi-based sports betting firm. He works on building real-time, scalable backend systems. Formerly, he worked as a data engineer for a fintech start-up, where his role involved developing and deploying data pipelines and machine learning models to production. He holds a degree in electrical and computer engineering and often writes about distributed systems.