Someone else made a very thorough description of the interview process, and it was essentially the same for me, so I will not write quite as detailed of a review as I normally do.
For starters, it took 140 days in total. I applied September 3rd, 2020, was first reached out to on October 16th, had several interviews along the way just as a previous reviewer described, and eventually got rejected today, January 20th, 2021. Yes, seriously! I'm guessing that this will be the longest interview process I will ever go through (fingers crossed). That being said, I am very thankful for the experience as Voleon is one of the few companies that actually considered me seriously. Also, I think worth noting that I was updated fairly regularly on the process so they did not leave me completely in the dark for that entire time.
The actual interviewing itself did not take incredibly long, maybe 3-4 weeks in total. Hearing back is what took a while, as scheduling meetings was difficult with covid and they wanted to interview more candidates to broaden the pool to choose from since they were planning on hiring 3 people for the position.
All of my interviews felt very relaxed, and I sincerely enjoyed talking to each and every one of my interviewers. They were all very nice and genuine and I have only positive things to say about each of them. I would have loved to work with them. It has been almost two months since I interviewed with them last, so I can't remember the specific questions very well. However, all of the questions were behavioral or asked about past projects/experiences I've been a part of. I remember that none of them were super obscure questions, and I really appreciated that since I'd previously been blindsided by other interviewers that asked for a super specific experience that not everyone would or should have.
One thing I would like to note, though, is that the job posting was listed as looking for recent grads, but it was only after my second interview with them that they revealed that the position typically starts in July! This is pretty important information to leave out of the job description – albeit, maybe accidentally – given that the term recent grad could easily be interpreted as someone who had recently graduated in the given year.
Lastly, I don't quite understand why the COO made the final decision since I never spoke with him. This felt a little unfair since he was only given second-hand impressions of me. Of course, I don't know exactly how it was decided so I don't have a big problem with that, it's just a tiny criticism of the process. C'est la vie.