Team Developers


  • Klaas Joosten, B.  CEO – Founder
    Klaas is now CEO of ZEEF and was the Chief Technical Officer of Mbuyu /M4N, the company that among others employs JDevelopment. Klaas is creator of the vision behind the filter ZEEF. ZEEF filters the world’s information with the help and expertise of passionate experts.
    My ultimate GOAL is to help people find the right information with our product.


  • Arjan Tijms, MSc Lead Developer/Software Architect
    Arjan Tijms has been involved with programming from an early age. He graduated at the University of Leiden to obtain his MSc (Computer Science, High performance computing). Arjan has been very active in the Java community. He writes at both the JDevelopment team blog as well on his own blog. Arjan has contributed quite a number of ideas to the Java EE platform and together with Bauke Scholtz has started the popular open source OmniFaces project. He is currently a member of both the JSF and Security expert groups for Java EE 8.

  • Bauke Scholtz, BSc Web Application Specialist
    Bauke, also known as “BalusC” in many online communities, comes with a strong background knowledge in Java EE web application development. HTTP, HTML, CSS, JS, JSP, Servlet, JSF, Facelets, he knows pretty much everything in depth. He (re)writes code with high standards of quality. Very specific functional requirements are in no-time turned into elegant code.

  • Jan Beernink, MSc Senior Java Backend Developer
    Jan is a strongly technical inclined and serious Java developer. After finishing his studies at the Free University of Amsterdam, Jan gained practical experience with Java at a consultancy firm and obtained Java certificates like SCJP, SCDJWS and SCBCD with truly amazing scores. Together with Arjan he periodically spot checks code for areas that can be improved (best practices, conventions, etc) and educates other developers how to improve their code.

  • Hongqin Chen, MSc Mid-level Java Developer
    Hongqin holds a Master of Science degree for Computer Science (University of Leiden) and works with us as a Java developer. Hongqin has practical experience with JSF, and specifically JMS. Operating from China, Hongqin is the go-to person for matters concerning the Chinese market.

  • Dennis Brouwer, B. System integration, hardware tuning, occasional Java developer
    Dennis likes to tune servers and systems to the max by tweaking them over and over again and not letting a system rest before every button has been tried and every wheel has been turned. Give him a server and eventually smoke will come out of it. Apart from this, Dennis specializes in monitoring overall system performance, database management, setting up development servers and environments, preparing scripts for hardware or service migrations. In addition to this Dennis participates in the development tasks with a little Java programming here and there. Is there anything Dennis doesn’t do?

  • Robin Eggenkamp, MSc. Java and iOS developer, ScrumMaster
    Jack of all trades Robin has studied Software Engineering at the University of Amsterdam and studied Science Education and Communication at Eindhoven, University of Technology. Robin has the talent of making himself at home with a new technique in the blink of an eye and applying it in a natural way. Besides being a Java developer, Robin is an iOS developer. He sells iPhone apps in Apple’s App store, and in 2009 has won one of only 400 student scholarships to attend the 2009 Apple WWDC in San Francisco.

  • Rick Boerebach Junior Java Developer
    Rick specializes in Android application development. He has displayed an aptitude for discovering security vulnerabilities in web applications.


  • Arjan Pronk Assistant tester
    Arjan pronk is currently studying business oriented computer science at the HVA Amsterdam and strengthens our testing department by helping Anton with the more technical issues associated with testing. Arjan has strong capabilities for scripting tests (Selenium among others) and is well at home with computer technology in general.

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