Programming:
Excellent knowledge of C, Java, C++ and bash scripting. Also a little experience with python, perl and php.
Sysadmin:
Over 6 years of Linux servers administration, especially Gentoo Linux, but also a solid knowledge of Debian and RedHat derived distributions. Vast experience of installing, configuring and maintaining Apache, Nginx, Mysql servers for various specific needs. Also experienced in performance tuning and bottleneck removal of Linux systems.
Webmaster:
HTML and CSS scripting, installing and maintaining CMS systems such as Drupal, Joomla and Wordpress, and forums software such as MyBB, SMF, and phpbb. Experience in SEO and community forums running.