One technique I use is I ask them what are the things they know well. Hopefully, there will also be something that I know. I then start digging in the area they

One technique I use is I ask them what are the things they know well. Hopefully, there will also be something that I know. I then start digging in the area they have already advertised they know well and try to judge what it means when they say they know something well. Also if a candidate can master even one thing very well, it gives hopes they are at least somewhat interested in development and can learn other things, too. What I found is that people who are not interested in development but rather do this because it pays well almost never learn anything very well. They just don't have drive and curiosity needed to dig one topic long enough after what they have learned was enough to complete the task they were assigned.