Two phone screens, both with Senior Software Development Engineers. First one seemed almost all behavioral, with a few questions that look for technical insights. Questions on how to manage that one team member who is not performing well, how to hire, etc. Very polite and professional interviewer. After about 55 minutes of questions, asked if I had any of my own. Usual small talk, and then we hung up. Second one was again a polite and professional interviewer. Started out with team management questions, hard/difficult decisions in the past, choosing between two technically viable solutions, etc. Then there were a few technical questions, and as expected, had all to do with scalability issues.