Linux and Open Source

Take advantage of the benefits of free software, increase the flexibility, reliability, and security of your IT infrastructure while reducing your costs.

IT security

SSL/TLS encryption, firewalls, VPNs, update and patch management, system hardening and security audits protect you, your systems and your data!

Internet and networks

E-mail and web hosting, domains, DNS services, router and switch configuration, IPv6 or WLAN – whether your individual computer, corporate network, or cloud solution…


  • Installation and maintenance of Linux systems (such as RHEL, CentOS, Fedora, SLES)
  • Configuration of Postfix, Sendmail, MIMEDefang, Amavisd-New, Dovecot & Prosody
  • Virtualization with KVM and libvirt, integration of Linux in heterogeneous environments
  • Security optimization and auditing of existing Linux systems, hardening with SELinux
  • Tuning and configuring of Apache web server, MariaDB, MySQL and PostgreSQL
  • Building of RPMs and RPM packaging of software (e.g. RHEL, CentOS, Fedora, SLES)
  • Customizations and new developments in C, C++, PHP, Perl, Python and Bash/Shell

About me

  • Contributor at the Fedora Project since 2003 as packager, ambassador and mentor
  • Building of RPM packages since 2002, contributor at the RPM5 Project since 2007
  • International talks and workshops about SELinux and RPM packaging since 2007
  • Use of tunneled IPv6 since 2002, usage of native IPv6 since 2005
  • Community contributor at the Zarafa Collaboration Platform and Z-Push since 2009
  • Developerer of sip-redirect, pam_mapi, x509watch, mod_log_post and rpm2python
  • Publication of 9 vulnerabilities and 12 security advisories since 2007

Do you need help or support?

Aside of professional services, I also take care of the day-to-day problems with computers, networks and internet.