What is a Japanese translation of techie?

I like to give my friends japanese nicknames, as we're all otaku and love anime and the japanese language. I have nicknames for 2 out of 5, and so I'm steadily finding nicknames for the other 3. One of them, the only guy of the group, is a big computer geek and in english would be called a tachie. Is there any name in japanese (like "Honya-san", which is bookstore, for bookworms) that would be the equivalent to techie?