Extract of work since 1992.

Ruby/Rails Projects

  • Carl Schröter GmbH: Ruby on Rails Developer/Administrator
    Since 2005 til today development and hosting of three web application in the area of transport insurance.
    Fullservice: Consulting, development (Ruby, HTML, CSS, JavaScript), hosting, coordination of external service provider.
  • Wacku: Ruby Developer / 2016-now
    Building a private community system based on event sourcing.
    Ruby , Redis, Elasticsearch, CQRS, Docker Cloud.
  • XING AG / 2015
    Senior Ruby Developer
    Payment & Billing Team
  • Audible Web GmbH ( / 2013-2014
    Senior Ruby Developer
    Portfolio for journalism (Rails/Elasticsearch)
  • tolingo GmbH 2012
    Senior Ruby Developer/Team Coach
    Relaunch Shop
  • XING AG / 2009
    Senior Ruby Developer
    Rails Architecture Team, project Company Profiles and Best Offers
  • AFC Auto Fleet Control GmbH (on behalf of Hays) / 2007
    Code Review
  • Kathrin Hohberg / 2006-2009
    CMS for managing photographs
  • Bellybutton International GmbH / 2006-2007
    Relaunch Online-Shop, development of CMS and CRM

Java Projects

  • VZ Netzwerke Ltd / 2012
    Senior Java Developer/Team Lead
    Refactoring activity stream / Project Events
  • eSailors IT Solutions GmbH / 2010
    Senior Java Developer
    Project Dunning
  • Vattenfall Europe / 2006
    Senior Java Developer
    STO2 (NDA)
  • comdirect bank AG / 2005
    Java Developer / Java Architect
    Teaser Service, architecture evaluation (u.a. EJB, Spring)
  • comdirect bank AG / 2003-2005
    Java Architect
    Responsible for inhouse Java middletier framework
  • comdirect bank AG / 2002-2003
    Java Team Lead
    Order tools für asset managers

C/C++ Projects

  • ArtCom GmbH / 1998-2000
    C Entwickler
    Developing a PostScript interpreter
  • Röders GmbH / 1992-1997
    C/C++ Entwickler
    Control software for high speed milling machines


  • Ruby on Rails, Git, software design for example at Versicherungskammer Bayern, AutoScout24, XING AG.
    See Trainings.


  • Book author of Rapid Webdevelopment mit Ruby on Rails, Hanser Verlag.
  • Articles in magazines like Java Spektrum, c't, iX, JavaMagazine.
    See Publications.


  • A couple of talks at german conferences. See Talks.

Conference Organizer

  • Founder and organizer of the german Rails-Konferenz in 2006, 2007, 2008 and 2009.