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Asking for this might have been the only thing that would have saved me from one of my worst hires. She had good answers to technical questions, could explain past projects, all manner of things were covered, however, what I didn't know is that she would never ever ever use any off-the-shelf library or software to do anything. It was a wonder she didn't try to cobble together her own server too.

When explicitly told to use the connection pooling in Tomcat or include a library to do it, she still wrote her own solution which fell down every time the database was taken down and didn't bother reconnecting.

Now I try to ask questions to try and weed that kind of candidate out, but maybe something more generic about missing information and queries about what solution would be proposed for something fairly complicated might have rooted that out during the interview.