I'm coming at this from a non-traditional angle: I made it through the Genentech behavioral rounds for a program management role (not SWE), so my experience is a bit different from the engineering posts you usually see. Sharing because I think the values piece generalizes across functions.
Genentech is genuinely mission-driven in a way that the interview reflects. Before I go into the questions, I want to say: if you don't actually care about the healthcare/biotech mission at some level, that will come through. Multiple interviewers asked me some version of "why Genentech specifically" and they were clearly listening for something beyond "great company, great culture."
Actual behavioral questions I got: Tell me about a time you worked on a project where the stakes were high for people outside your organization (not internal stakeholders, actual end users or patients). Describe a situation where you had to push back on a technical decision because of a downstream impact you anticipated. Tell me about a time you had incomplete data and had to make a call anyway. How did you document your reasoning? Walk me through a conflict with a cross-functional partner and how it got resolved.
Those are not rote STAR prompts. The third one especially felt targeted: at a pharma company, decision documentation is a real thing, not a soft skill.
What I noticed: they interrupted me once to ask a follow-up before I finished my story. That felt uncomfortable in the moment but I think it was intentional. They want to see how you respond when you can't just recite a prepared answer.
Values I kept seeing surface: patient focus, scientific rigor, honest communication (including bad news), and collaboration across disciplines. If your stories can naturally touch one of these, they land better.
Happy to share more about the PM/program-side process specifically if that's useful.