I applied online. I interviewed at G-Research (London, England)
Interview
starts with cv screen and then get sent OA. If you do well enough you will have three virtual interviews afterwards and then finally an assessment centre to seal the deal
Test (20 question for 90 minutes if I recall correctly), then three rounds of interviews. Got rejected after the second round (which alone consisted of 3 interwiews).
I believe third round would have been on site.
Interview questions [1]
Question 1
Mostly questions on statistics. No advanced knowledge is required but you have to be able to use the basics very well and apply them to 'quant type' problems.
Some very random questions as well, e.g. what happened to oil price in 2020 april (went negative) and explain why
Everyone was very nice. They expect quick answers to questions and that you do not need much help. First round OA, second quantitative interview. They ask a lot about machine learning and computing