Hiring manager screen, skills challenge, 5-hour on-site.
During my on-site (virtual due to COVID), the interviewers gave strong verbal feedback, commenting about how I identified aspects of the challenges that were rare for candidates to find, so I felt good about it. A recruiter I had never interacted with before sent me an email a few days later asking if I had time to chat about the interview. At the start of the call, she asked me to talk about how I felt the interviews went, then told me I was too junior for the role and they would consider me at a lower pay for a different team. I asked for any constructive feedback besides being "too junior", considering I had invested 10 hours of my life interviewing with them, but she said their policy was to not share feedback.
Also, I learned during the interview that it turns out that Gusto doesn't use any titles, so you won't have anything to reflect your seniority or any external marker of promotions, even though the role was marketed in the job description as "Senior". The manager also said there essentially is no such thing as promotions beyond moving up the levels stored in the HR system, and when I asked directly about the ability to advance into people management, he said that almost never happens, so that was a red flag.