I applied online. The process took 4 weeks. I interviewed at Qube Research & Technologies (London, England)
Interview
Some simple questions about C++, data structures, networking fundamentals, sql. Not a lot of problem solving compared to other places. University courses/basic tutorials would likely cover most of those, except maybe for some c++ stl implementation details
Interview questions [1]
Question 1
which data structures are used for std::map/std::unordered_map