Could I see your portfolio? And do you do backend?
I don't have one setup. I generally have just been winging it. As for web design and non-minecraft work I tend to keep them separated from my Minecraft work.
I did work for ConstantPVP and others. One of my accomplishments on another being that I made a plugin that was capable of adding a layer of snow and freezing water, and vice versa, of an entire world without dropping the TPS.
Yes I do backend. Assuming you are talking web. I'm decent in PHP.
