Look at open-source projects you really like, figure out who coded the majority of it, and recruit that person.
Finding a cofounder isn't about interviews and having people find you. You are going to have to network, meet lots of people, and recruit the person you want to go into business with you.
To get a real cofounder who will stick with you through the good and bad, a few things need to line up:
- He must like you.
- She must like the idea.
- She must be at a point in life where she can work on the idea.
- You'll probably have to do a 50/50 equity split to get anyone worth working with.
There isn't a perfect place to find a hacker who needs a hustler. Most of it is happenstance, but you can increase your chances by attending hacker-related events. I hear at least one person a week looking for a "technical cofounder" and I rarely hear technies looking for a "non-technical cofounder".
You're going to have to work hard to find someone awesome. Don't settle for a B-list cofounder. Hold out until you find the right person.