I applied through other source. The process took 3 weeks. I interviewed at EF (Education First) (London, England) in May 2018
Interview
Interview was very slow, after a call there was a test task they ask to complete within a week, then a week of silence.
No feedback and overall quite ignorant and rude experience.
Interview questions [1]
Question 1
General experience: they don't have any experience in Machine Learning so don't expect any interesting conversation.