okay this one surprised me. i assumed a quant hedge fund would be almost entirely technical and the behavioral piece would be a checkbox. it was not a checkbox.
i went through two loops at RenTech over the past couple years (yes, two, different roles). both had a meaningful behavioral component. here's what actually came up and what i think they're looking for.
questions that appeared across both loops: "describe a time you worked on something technically ambiguous where the requirements weren't clear." "tell me about a disagreement you had with a teammate or manager over a technical decision. how did it resolve?" "describe a project that failed or significantly underdelivered. what would you do differently." "how do you approach learning something you don't know when you're under time pressure?"
what i noticed about what they're actually probing:
they want intellectual honesty above almost anything else. the failure question is not a trap, they actually want to hear you own something real. i gave a genuine failure in my second loop and the interviewer nodded and then asked good follow-up questions about what i changed. felt like they respected it.
they also care about collaboration but in a specific way. this is not a "describe how you uplifted your team" company. they want to know: can you push back when you think something is wrong, and can you update your view when given better information. those are different skills.
the culture undertone: rentech is famously secretive and selective. the people in my loops were clearly brilliant but also not performatively warm. the vibe is: we are serious people doing serious work. if you thrive in that environment the behavioral round feels like a real conversation. if you need explicit praise or warmth in your work culture, read that signal early.
one of my interviewers said outright: "we have very few bureaucratic layers here. if you have an idea you can pursue it pretty directly. but you also have to be right, or at least credibly argued for."
i thought that was pretty honest.