It's an extremely long process that includes standardized tests, take home assignments, and several rounds of interviews. It was at least 5 rounds long and you interview across different teams.
Average interview
Application
I applied online. The process took 3 weeks. I interviewed at Canonical in Feb 2015
Interview
After applying through their website I've received an email from the HR asking about my availability for a video-conferencing interview. The interview was very relaxed and the interviewers very friendly. After about two weeks I was told they had found someone else better suited for the job.
Interview questions [1]
Question 1
Mostly questions about my experience with programming and open source contributions.
I applied through other source. I interviewed at Canonical (London, England)
Interview
They have a really long, tiring interview process. The first round was a written interview where I had to answer like 15 questions. Then a coding interview with 1 hour time that I could do anytime for 2 weeks. Then I had to take a personality test and they totally ghosted me.
The first round is a bunch of questions like 30 or so where you have to describe your expierence, personal and academical information. Then there is a asynch technical interview and a psychology test.