In addition to counseling and training activities, Hüseyin Akdoğan has been developed enterprise applications with JavaEE technologies since 2005. His areas of expertise are JavaServer Faces, Spring Framework, some 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.