I applied online. The process took 2 months. I interviewed at Hudson River Trading (London, England)
Interview
You send your resume, then there were leet code style questions for the take home assessment. After that there is an interview where details of C++ are asked. And after that there are other interviews that I did not attend.
Interview questions [1]
Question 1
3 leet code mediums + 1 leet code hard for the initial interview.