I interviewed at their Berlin office, everybody was welcoming and in general seemed like a nice group of people.
The interview was 2 hours, first a small introduction, then 30min algorithmic and roughly one hour system design task.
They were accommodating and I felt pretty relaxed due to that.
Interview questions [1]
Question 1
I was asked to look at a matrix of pixel data and asked for a method/algorithm to find certain values within an area of interest.