It is a long process, and you're expected to put a lot of time into it. I did 3 phone calls and 2 on-sites, one of which was a full Figma demo and presentation. Everything was fine and everyone was friendly, the point of frustration was that I was told than if I got to the demo/presentation the job was "basically mine" and something would have to go very wrong to lose it. They gave me a very detailed criteria on what to present, one of which was for there to be only 3 slides. During my presentation I was interrupted with "Do you only have 3 slides?" When I said yes I felt the entire atmosphere dampen and as though I'd really screwed up. I don't think they knew that the criteria had asked for this and even said afterwards they wish I had more slides. I waited a while to hear if I got the job, and finally after emailing and asking if there were any updates I received a rushed and pretty sloppy denial email that informed me "we unfortunately decided not to go forward" with no reason why other than "other candidates were stronger". This is fine, only I felt like I was owed more of an explanation as the recruiter had told me they weren't speaking with many others and she had a strong feeling I'd get the job. I put 4 weeks of hard work into the interview process and was told throughout it was looking great so receiving a badly written, vague email and having clearly upset those interviewing me by following the exact steps I was given for the my presentation - I felt a little like I had wasted my time. But they are all extremely pleasant and nice people and overall the process was fairly enjoyable.