Aslak Knutsen

Arquillian project lead Aslak Knutsen is currently a Senior Software Engineer at Red Hat where he is working on projects such as Arquillian, ShrinkWrap, Weld and Seam 3, one of the founders of the JBoss Testing initiative and a speaker at major industry conferences including JavaOne, Devoxx, Jazoon, JFokus, Geecon, JUDCon and JBoss World.


Wojtek Erbetowski

Wojtek Erbetowski is (co)organizing multiple community groups and events, e.g. there are Warsaw Java User Group, Mobile Warsaw, Warsjawa, Git Kata and Mobile Central Europe. Wojtek is coding Python, Scala and Groovy. He’s paying his rent thanks to position of a Tech Lead at Polidea and spends free time sharing his experiences with other developers (Confitura, 33rd Degree, Eclipse DemoCamp, Git Kata, WJUG, PyCon, PyWaw, Mobilization). He coauthored RoboSpock – Android unit testing framework.


Geertjan Wielenga

Geertjan Wielenga is a developer evangelist and product manager for NetBeans IDE and the NetBeans Platform. He has delivered sessions and training courses around the world on themes from rich-client application development with the NetBeans Platform to HTML5 development with NetBeans IDE. He is a passionate Java evangelist involved in the industry since 1996 and lives in Amsterdam. He blogs daily at and tweets at @geertjanw.


Sergi Almar i Graupera

Sergi Almar is the CTO and cofounder of PayTouch, a startup building a biometric payment system. Prior to that, Sergi was consulting for SpringSource / VMWare delivering official training worldwide. Sergi is a passionate Java ecosystem hacker and a core member of the javaHispano JUG. He is also the lead organizer of the annual Spring I/O conference in Spain.

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Stephen Ball

Stephen Ball is a Chartered IT Professional and product Evangelist for Embarcadero regularly speaking across Europe and Africa. Including recently at AppsWorld. Stephen brings a unique sense of product and practical business insight from over a decades multi-national first-hand experience leading development teams on projects working with RadStudio and InterBase on products for a range of blue chip companies including Hilton, American Express, Virgin Active, Range Servant and Fitness First. Stephens blog is Stephen is also the Associate Product Manager for InterBase, which provides secure data storage for Windows, Mac, Linux iOS and Android.


Artem Bilan

Artem Bilan is a key software engineer in the Spring XD team and he developes tools for messaging and loosely-coupled and distributed solutions. He is an active Spring community consultant and helps end-developers to make their messaging solutions better.

When he has a free time he just contributes to other Spring projects.


Mani Sarkar

Mani Sarkar is a passionate Java/JVM developer currently living and working in London, UK for a data analytics Bright North, an LJC Advocate to the @adoptopenjdk & @adoptajsr programs, JCP Member, OpenJDK contributor (submitted a number of patches), active member of a number of developer communities, speaker, blogger, and tweets interesting topics. He sees himself working in the areas of core Java, JVM, JDK, Hotspot, Nashorn and Performance Tuning. In his free time he also works on open-source projects one of them being in relation to RESTful APIs, others can be found on his personal github and bitbucket accounts. He is also an advocate of software craftsmanship principles like BDD and TDD, practices like pair-programming & collaborations – fervent user of SonarQube, analysing code quality on a regular basis. Recently he has been dabbling with concepts like Machine Learning and Data Analytics. A regular at many talks, conferences and hands-on-workshops in and around the UK and other parts of Europe.

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Alexander Shopov

Alexander Shopov has been a programmer for more than a decade now, has a wide experience in programming and has survived it. He never lets common knowledge stop him since he knows the purpose of it is to stop you.

Relevant to Java2Days are his experience in Java, JavaScript and databases large and small. He has taken part in many facets of the software industry:

  • Applications and services for the administration almighty;
  • Catering to the needs and whims of commercial clients in the fashion, retail, relocation, building, furniture business;
  • Currently he is a software developer at Cisco Systems.

He suspects that someone has been naïve enough to scream “Enterprise” three times into a mirror and this explains why the Enterprise still haunts us.

Otherwise he is generally a nice guy except for the times when he is not.He wields his sense of humor in mysterious ways. He loves free and open source software, contributes to it and is the Bulgarian coordinator of GNOME translations.


Mite Mitreski

Mite Mitreski works on custom enterprise application development and consultancy with primary focus on Java and JVM-based solutions. He has worked as a programming course trainer in the past. Currently he is deeply involved in activities surrounding development groups in Macedonia, where he is currently the JUG Leader of Java User Group, Macedonia. Mite has a great passion for free and open source software, open data formats, and the open web. Occasionally, he writes at his blog and can be reached on Twitter. Recently he co-author a book titled HTML 5 Data and Services Cookbook.


Vassil Popovski

Vassil Popovski is a software developer, architect and manager with more than 14 years industry experience, mainly with Java enterprise projects. Vassil is currently Director R&D at VMware, where he is leading a team of 100+ engineers working on various projects. Before that he was Director QE, leading the entire quality engineering organization in VМware Bulgaria. He also spent couple of years as staff engineer at VMware working in Cloud computing department and he was leading the definition and the implementation of the vCloud API – open, platform independent, RESTful API that defines an interface for providing and consuming virtual resources in the cloud.

Vassil is an expert in cloud computing, OSGi, RESTful web services, continuous integration, unit and integration testing, distributed and transaction systems, advanced algorithms and data processing.