Joomla expert - writing own components/modules/plugins and making modifications for existing
Joomla temaplte 2.5 comaptbile
Writing app in PHP + MySQL
Photoshop advenced user
Marcin did and excellent job, very professional and obvious to me that he has very good knowledge of php/mysql that exceeds mine which I find extremely rare on freelancer.com. I recommend this talented coder to anyone because he will not waste your time with excuses or over state his abilities.