Liz Wessel wants to know how flexible job candidates are before hiring them at her company WayUp, a site that connects students and recent grads with jobs at places like Uber, Microsoft and Google, where Wessel previously worked.
"Flexibility is so crucial when you're working in a fast-paced environment like a start-up because things change really quickly," the CEO and co-founder tells CNBC.
That's why her favorite line of interview questions to ask is designed to make job candidates uncomfortable.
"I like to see how they react and whether they're able to stay calm," Wessel explains.
"I don't do this because it's fun — I do this because I want to see whether they can keep their composure and how they perform when they're out of their comfort zone, which is often the reality in the start-up world."
While she doesn't have one go-to question, Wessel uses various strategies to put candidates in an uncomfortable position and gauge their flexibility.
"Sometimes, I just push back on something they designed or created and play devil's advocate to see how they react to different opinions," she says. "Other times, I ask questions like, 'Why would someone not get along with you?'"
She's looking to see how they might rectify the situation, if at all: "Are they looking to improve on what they do that pisses others off, or do they just leave it as is?"