I interviewed for the above role about a month ago. It consisted of three rounds: HR (30 minutes), Task (3-4 hours), and a call with the department head (1-1.5 hours). For the first round, they asked me to lower my salary expectations, to which I said I was flexible, and then we proceeded. The first two rounds were pretty easy and the final one was long (including a short cultural fit for 10-15 minutes with the other colleagues). After waiting and going through all these rounds they come up with a generic rejection email template. My impression about this is that it was unfair (to not give a reason why I was rejected, especially after I invested around 10 hours in preparations and interviews for this role). No wonder this position has been vacant for 8 months!