[eru]

That would be an interesting way to apply something like re-captcha: ask them to fix two bugs in open source applications. One bug that you've actually already fixed, so you know how hard it should be and can calibrate; the second bug is open.

[nileshtrivedi]

How about just asking them to code something - anything - in say, a couple of hours?

[eru]

To make this useful for an interview, you have to set it up so that people can't submit things they've coded up before in a much larger timeslot.

[smikhanov]

Not all codes are created equal.