Hüseyin Akdoğan began his software adventure with the GwBasic programming language. He started learning the Visual Basic language after QuickBasic and developed many applications until 2000, after which he stepped into the world of Web with PHP. After this, he came across Java! In addition to counseling and training activities since 2005, he developed enterprise applications with JavaEE technologies. His areas of expertise are JavaServer Faces, Spring Framework, and big data technologies such as Hadoop, Elasticsearch, NoSQL. Along with these, he is also trying to specialize in container technologies, DevOps tools, and Reactive Programming. Huseyin also writes articles on Java, Vert.x, and big data technologies and works as a technical reviewer of big data books. He is the author of Elasticsearch Indexing book and also he was a reviewer of one of the bestselling books, Mastering Elasticsearch – Second Edition.