I went through the full Roblox loop earlier this year and the behavioral rounds were more structured than I expected. Two separate behavioral sessions, each 45 minutes, different interviewers. Sharing the question themes because I couldn't find a good breakdown anywhere.
The themes I kept seeing:
Ownership and follow-through. They want to hear about a time you took something way past your job description. The framing they used was "tell me about a project you owned end-to-end." They were specifically probing whether you stopped at shipping or actually followed up on impact.
Cross-functional complexity. Multiple questions about working with non-engineers. I got "describe a time when you had significant disagreement with a PM or designer and how it resolved." They weren't looking for "we talked it out, everything was great." They wanted to see the actual friction and your reasoning.
Building in ambiguity. "Tell me about a time you had to make a decision with incomplete data and were wrong. What did you do." That last part is key, they want the recovery, not just the mistake.
Speed vs. quality tradeoffs. Roblox runs fast. They asked me directly how I balance shipping quickly with long-term code health. I think they're screening for people who've actually thought about this, not just people who say "both matter."
One thing I noticed: they didn't seem to have a formal list of values on their careers page but the questions mapped really closely to "trust, speed, ownership, collaboration" themes. Multiple interviewers asked about impact quantification. If you can't put a number on your outcome they'll ask you to estimate.
For context I was going for a senior IC role. I have a two-year gap on my resume (caregiving) and honestly the behavioral rounds felt like the right place to address the gap story, which I wove into one answer naturally. Nobody made it weird.
Overall I felt like it was a grown-up loop. Not a gotcha culture. But they do expect specificity.