I once worked with some developers that literally did something close to what you described. In a nutshell, it was for an advanced job-employee recommendation a

I once worked with some developers that literally did something close to what you described. In a nutshell, it was for an advanced job-employee recommendation algo. I knew how the algo should work, it was a form of collaborative filtering, but hadn't a clue how to write test cases. It was a really hard problem.