[dceddia]

I agree with your idea of a proxy. Others seem to be interpreting it as asking trivia questions about your favorite pet projects and technologies. I don't think that's what you're doing.

In any given specialty, I think good developers will pick up the stuff around that specialty. Java devs will learn about Maven and git and maybe some JVM customizations to tweak memory usage. Rails devs will learn about which gems are widely-used to solve specific problems, and git, and maybe some devops/deployment stuff with SSH keys and Capistrano.

The particulars matter less than that there's some amount of holistic knowledge of their specialty. Of course one can argue the specifics (what if they've used svn but never touched git, etc)... but if there are no specifics -- if the candidate only knows their specific language of choice but nothing outside of it -- I would argue that they're probably not that great.