When hiring developers, fetch a stoic subordinate who is A) good at eye contact and B) able to maintain said eye contact without blinking.
Have this subordinate and the candidate participate in a staring contest. This will show a couple of things about the candidate: A) How well they maintain eye contact (very important for communication) and B) How long it takes them to back down from a challenge; this taps into their primal instincts.
I've had managers be critical of candidates with poor eye contact before. I've had to remind them that not everyone is good at that. It certainly isn't required for being a software engineer.
Imagine how valuable pupil dilation would be to a giant tech company pushing infinite scrolling with advertisements to a user base capturing most of America.
Have this subordinate and the candidate participate in a staring contest. This will show a couple of things about the candidate: A) How well they maintain eye contact (very important for communication) and B) How long it takes them to back down from a challenge; this taps into their primal instincts.