What can I do for you?

My services cover the entire spectrum of technical conception and creation of websites, webshops and apps, for mobile devices and desktop computers.

Conception Production Maintenance


The technical concept and the selection of frameworks are essential in advance and influence your entire future interaction with the website or app. For example, it may turn out that a cost-effective Jimdo site is sufficient or that it is necessary to use a comprehensive enterprise CMS, such as TYPO3.

Complexity is the enemy of security, i.e. the lowest common denominator is sought, the simplest system for the respective requirements. This also applies to the user interface of the app or the UX/navigation concept of the website. A clear structure makes it easier to use and find what you are looking for.


In programming, I draw on over 15 years of experience in developing apps and websites. What I program is tested and works. Related to the technique I offer

  • Frontend programming in HTML5, CSS/SCSS, Bootstrap 4, JavaScript, ES6 and jQuery
  • Backend programming
    • in Java, Java-EE-Stack, Spring, Hibernate
    • in JavaScript, ES6, Node.js, socket.io and Electron Apps
    • in PHP, and in this respect expertise in the web systems Redaxo, Wordpress, Magento and TYPO3
  • Quality control and automated tests of web apps and shop systems, unit tests, test automation with Selenium

Operation and maintenance

In order for your website or app to run stable, it is necessary to regularly update the system. Data loss can be counteracted with a backup concept. With a maintenance contract I can offer you a carefree flatrate for a functional server system that runs stable and always has all important security updates installed.


Customer feedback

 "Stefan Haack has extraordinary knowledge in all areas of web development. Concentrated competence paired with reliability and high quality standards."
Sandra Grob, Project Management MTC GmbH

"Excellent implementation of the programming of our new homepage, including the mobile version. Very structured working!" 
Christian Zeymer, Managing Director Fuhrberger Zimmerei Betriebsgesellschaft mbH