Hüseyin Akdoğan's software adventure began with the GwBasic programming language. He started learning the Visual Basic language after QuickBasic, and developed many applications with it until 2000 when he stepped into the world of Web with PHP. After that, his path crossed with Java! In addition to counseling and training activities since 2005, he developed enterprise applications with Java EE technologies. His areas of expertise are JavaServer Faces, Spring frameworks, and Big Data technologies such as NoSQL and Elasticsearch. In addition, he is trying to specialize in other Big Data technologies.

Julien Duponchelle is a French engineer. He is a graduate of Epitech. During his professional career, he contributed to several open source projects and focused on tools that make the work of IT teams easier.

After he led the educational field at ETNA, a French IT school, Julien accompanied several start-ups as a lead backend engineer and participated in many significant and successful fundraising events (Plizy and Youboox).

Marcelo Ochoa works at the system laboratory of Facultad de Ciencias Exactas of the Universidad Nacional del Centro de la Provincia de Buenos Aires and is the CTO at Scotas.com, a company that specializes in near real-time search solutions using Apache Solr and Oracle. He divides his time between university jobs and external projects related to Oracle and big data technologies. He has worked on several Oracle-related projects, such as the translation of Oracle manuals and multimedia CBTs. His background is in database, network, web, and Java technologies. In the XML world, he is known as the developer of the DB Generator for the Apache Cocoon project. He has worked on the open source projects DBPrism and DBPrism CMS, the Lucene-Oracle integration using the Oracle JVM Directory implementation, and the Restlet.org project, where he worked on the Oracle XDB Restlet Adapter, which is an alternative to writing native REST web services inside a database resident JVM.

Since 2006, he has been part of an Oracle ACE program. Oracle ACEs are known for their strong credentials as Oracle community enthusiasts and advocates, with candidates nominated by ACEs in the Oracle technology and applications communities.

He has coauthored Oracle Database Programming using Java and Web Services by Digital Press and Professional XML Databases by Wrox Press, and has been the technical reviewer for several PacktPub books, such as "Apache Solr 4 Cookbook", "ElasticSearch Server", and others.