Linux/Unix operating systems

• Administration relating to MySQL, Apache, mem cache, PHP, cron (scheduled/overnight jobs), and more
• Troubleshooting performance issues

Apache 1.3 / Apache 2 web server

• httpd.conf configuration
• Virtual Server / sub-domain setup
• .htaccess with mod_rewrite (URL RewriteEngine)
• Various other modules (e.g. deflate, expires)

MySQL 4/5

• Configuration and optimisation
• Relational database design
• Excellent SQL, including views, stored procedures and triggers

PHP 4/5

• Clean, elegant, well-commented code.
• OO design
• Experience with memcache, dom-xml, curl, gd (image processing), and sockets extensions
• MVC-pattern frameworks

XHTML / CSS / Javascript

• Hand-coded, standards-compliant HTML, and CSS/table-less layouts
• Javascript (including AJAX, and YUI-2 framework)

Also

• Revision control with subversion
• Registration of domain names and configuring DNS records
• Fundamentals of SEO
• Setting up email forwarding / postfix configuration