[postblogism]

While there are all kinds of tests and ways to measure a developer's ability, most of these are outdated and were more appropriate 15 years ago prior to mass framework adoption - developers now just aren't going to spend a lot of time doing low level algorithms, because they don't need to.

But the best way that I've come across is to judge character traits. Intelligent people always have listening as a core component, where as less intelligent people will be very dismissive and constantly interrupt people. These are traits you can definitely sift out in interviews.