Work Experience

Here you can find some examples of work I have done.

04.2015 - 12.2015 Questback GmbH

Senior Software Developer

field of work
  • development of PHP and MySQL back end product

  • project specific customizations

  • integration of RDF GraphStore and SPARQL queries into existing software infrastructure

  • technologie evaluation


PHP, ZEND, mercurial, MySQL, EasyRDF, BlazeGraph, RDF, SPARQL, shell, JavaScript

06.2013 - 01.2015 Rockethome GmbH

Senior Software Developer

field of work
  • development of PHP and MySQL back end for SmartHome platform

  • implementation of web front end for SmartHome platform

  • development of automatic device detection and handling

  • development of REST interfaces

  • customer and partner communication (technical)

  • project specific customization

  • SmartHome device analysis

  • SmartHome network communication analysis


PHP, ZEND, git, SOAP, REST, MySQL, JSON, HTML, JavaScript, Wireshark

System Administrator

field of work
  • analysis of existing infrastructure

  • analysis of cloud (IaaS) services

  • system clean up

  • encrypted backup and recovery automation

  • implementation of automated system managemant based on ansible

  • development and implementation new renundant System Architecture

  • deployment automation for production and testing

  • documentation of system architecture, usage and emergency plans


Linux, Ansible, Python, ssh, shell, PHP, KVM, libvirt, nginx, apache, DNS, reverse proxy, load balancing, iptables, MySQL, MariaDB cluster, memcache

03.2009 - 08.2012 Electrobrothers GmbH & Co. KG

now part of repucom

Software Developer/System Administrator

field of work
  • development of a PHP front and back end

  • development of a distributed renderer based web scraper

  • web site analysis for generic and site specific web scrapers

  • integration of different software systems into SOA

  • development of a specific deployment system

  • MySQL DB architecture, administration and optimisation

  • system administration


Shell, Python, PHP, JavaScript, JQuery, HTML/CSS, MySQL/Percona, Subversion, SOAP, REST, JSON-RPC, Multiprocessing, distributed computing, SOA, micro services, RSS, Atom feed

10.2008 - 09.2010 University of Cologne

Assistent System Administrator

field of work
  • integration of Linux into Microsoft Windows Server Active Directory domain

  • manage Windows/Linux dual boot user systems

  • develop CD/DVD based automated update mechanism

  • documentation and web site maintenance

  • user support


OpenSuse Linux, Samba, pam (Pluggable Authentication Module), Wireshark, grub, shell, TYPO3

11.2007 - 09.2008 neavis GmbH

Frontend Software Developer

field of work
  • implementation of web designs (IE6 - IE8, Firefox, Safarie, Chrome, Opera)

  • development of JavaScript web application


HTML, CSS, JavaScript, Prototype, Ruby on Rails