In my case, I was knowingly referred by another contact I was interviewing with. It began with a 30 minute screening interview with People.ai's Internal Recruiter. Next, I was invited in for a short 1-on-1 with the hiring manager. That was followed by an additional round of on-site interviews with various team members, and a short presentation highlighting my ability to run a mock meeting on a subject I was familiar with. Essentially, they had me present a deck I was familiar with, rather than one they provided or asked that I generate. Definitely preferable, IMO.
Following the presentation, I had one more round of on-site interviews with senior leadership, before meeting with a VP for drinks to get to know each other a little more, and for them to provide the framework of the offer they informed me they would be making.
Coming from a start-up myself, I really apprecaited the teams' focus not simply on skill-set, but also on cultural fit. The interview process familiarized myself with the company enough for me to know it was somewhere I really wanted to work, and based on the outcome, I think it gave them a very well-rounded idea of who I am, both as an employee, and a corporate citizen, I should also mention that even though there were multiple rounds, the entire process was completed in three weeks, and it probably would have been shorter if I hadn't just returned from a trip.
The recruiter I worked with was exception, and I feel like every step in the process helped assure a fit between myself, the company, and my new co-workers. 10/10 would interview again.