All the communication happens through extremely long, unnecessarily verbose, pre-written emails, that emphasis how they are looking for truly exceptional, outstanding, meriting, and extremely talented people.
After the resume screening stage, the written interview consists of 40 questions including "What sort of high school student were you?", "How did you rank among your peers?", "How extensive is your experience of Java?", "How have you gained this knowledge?".
Not only Canonical doesn't find their candidates' time valuable, but you will be asked the same kind of questions for the actual interview with someone that barely read your pre-written answers. And then you have to take the equivalent of a standardized IQ test.
This truly was a terrible interviewing experience.