I wonder if the OP can comment on whether GoldMine ended up biasing their decision to hire in an unintended way. In hiring security researchers, we have been finding that a lengthy technical exercise is terrific to properly gauge applicant skills, but that the scores of the test could end up weighing heavily on the decision to hire or not, potentially at the expense of unrealized potential. In other words, the candidate may have technical strengths not captured. I am assuming the approach only works to the extent that the test is a model of the actual problems the company is trying to solve. And yet they are looking for generalists. Somehow the test seems insufficient.