I had a similar experience to another poster here. Got a message on LinkedIn and decided to go forward with interviewing. The process involved an interview night with three interviews. 2 of them were entirely behavioral and the third revolved around the candidate asking questions to learn more about the company. Received positive feedback and moved onto a case study. Again, fairly straightforward where you answer some business questions based on information given to you and prepare a presentation. I received positive feedback again after that. Following that, I had a conversation with my HR contact about salary and was told my number could be acceptable. I was told to sit tight for a few days and wait to hear back. After about a week of not hearing anything, I reached out and was told to wait a week as they were busy. I waited another week and reached out again after not hearing. On that call, I was told they had to get some things together and wait another 3 weeks. At that point, it became fairly obvious that I likely would not be receiving an offer. Based off the other review here I think it was likely an issue with the salary request. I would have liked that they had been more straightforward with me in regards to any possible issues with that, however, I enjoyed the conversations with people I met so not all negative. Maybe I misunderstood, but based off the feedback, I think salary requests is likely where you could run into issues with this.

They do multiple rounds of interviews with different teams - first an intro with the Human Resources recruiter, then a manager, and then technical team to gauge fit of your experience.