Written test first and then if successful oral discussions. There are further rounds if successful. The written test can be taken from pretty much everywhere but I took it from London.

I applied through a recruitment agency and the entire process took a bit, but this was due a busy period on my side. There was a test in which there are many probability and statistics questions. Of course I can not say more due to confidentiality agreement. After that there was an interview from junior quants.