I won't elaborate on the process - it is well-known that it takes a lot of time and stages, there are no surprises related to this part. Instead, I'd like to highlight something else: the first interview where the candidate can discuss compensation goes during one of the late stages (in my case it was almost 2 months after the process began). That was the moment I realized that Canonical's maximum compensation was 15% less compared to my current salary. They were not willing to increase it and therefore rejected my application - 2 months of wasted time. This might be easily fixed by adding one more question regarding the candidate's salary expectation to the initial questionnaire.

The interview process is long and has many steps. It requires an initial written interview as well as online general intelligence and psychometric assessments as well as a coding test in python and a technical assessment where you are asked to explain a python based program not written by you to the interviewers as well as some general linux questions. The interview process is onerous and lengthy but I was not in a rush to complete so that was ok with me. In the end while they offered me a position the pay that they were offering was not acceptable to me so I declined.