front- and backend development
with focus on open-source-technologies

Hello, I'am Carsten Nielsen

I am a creative, analytic, freelance software-designer with 20 years of experience in webdevelopment and more than 100 all-sized succesfull projects delivered. With a freelance team of designers, photographers and copytexters I am developing tailored solutions that meets the expectations, goals and needs as well of customers, users and the involved staff.

Do you plan to relaunch your homepage or need support for setting up your online activities?

This developer is for hire!

Take a look at my services >>


Attention: I've opened new office in Flensburg with a new address...



  • User-friendly design of websites and web-based applications
  • Coding of accessible and standardized cross-browser (X)HTML and CSS
  • AJAX / Javascript GUI with jQuery


  • Online-applications with PHP, symfony-Framework and Doctrine/ORM
  • Database systems with MySQL, PostgreSQL


  • Experience with various CMS such as Typo3, Contao (Typolight), WordPress, Drupal, IP.Board
  • Concept and projectmanagement
  • Templatedesign and -production
  • Content editing
  • Training of editorial staff


  • Consulting on enterprise-level usecases
  • Implementation and roll-out support
  • Training for administrators and users
  • Examples: Alfresco Documentmanagement, Solr searchengine, Linux (Server & Client), LibreOffice, Firefox, Thunderbird, Gimp, Scribus, Inkscape

In addition

  • Trainings on different themes of online-marketing and -business
  • Production of printed material (image-editing, colour-management)
  • Audio- and videoproduction
  • Languages: German, English, Swedish

Checkout my references >>


For my projects I'am primarily using open-source frameworks and tools like PHP/symfony, MySQL, jQuery and of course HTML, CSS and JavaScript.

My editor of choice ist vim with some nice plugins. For imageprocessing I am using Gimp and for colorcritical jobs Photoshop.

100% handmade since 1997.

Personal information

Carsten Nielsen
Redpill Linpro AB - Changing the game
Friedheim 75
D-24944 Flensburg


Since September 2010 I'm working together with the outstanding team of Redpill Linpro.