One approach I've tried recently is getting a digital ocean box and giving the prospective candidate access to the box 24 hrs prior, just so they can install wh

One approach I've tried recently is getting a digital ocean box and giving the prospective candidate access to the box 24 hrs prior, just so they can install whatever tools they like if they so choose, and then giving the candidate a simple problem to build on the box for 30 minutes. Then we mute the phones for 30 minutes, so that people can work in peace, but we're around if they want to ask us any questions. And at the end of the 30 minutes we discuss how far they got, and what they would do differently, etc.. We've only done this twice, but I think it was fairly useful both times. Haven't done it enough to know whether or not this is a good approach.