[asdff]

Without going into anything identifying, what exactly were those circumstances? I'm imagining something like this happening, but at the same time I can't help but think if its a technical skill issue, handing them a book on the relevant technology and telling them studying this book is their job for the next two weeks would be better than trying to roll the dice again, put out a new job ad, interview, vet, rehire, and hope they aren't somehow just as technically incompetent as the original engineer.