I applied through an employee referral. I interviewed at DataArt in Aug 2017
Interview
The whole process was divided into two stages, the first one is interview in English (via mobile phone) with one of DataArt English teachers (it took approximately 15 mins); the second one is technical interview with one of DataArt specialists (usually it goes in their office, but as I was in other city, they agreed to do it via skype), it took about 1 hour.
Interview questions [1]
Question 1
When and why it is not a good idea to use a lot of non-clustered indexers in SQL tables ?