Hüseyin has been conducting counseling and training activities since 2005 for software technologies. 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 and DevOps tools. Huseyin also writes articles on Java 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 best-selling books, Mastering Elasticsearch – Second Edition.