I applied through college or university. The process took 1 day. I interviewed at Optiver (Oxford, England) in Oct 2018
Interview
three round written mental tests, about 20 people sit in a room and the first round is mental test we need to finish in 8 minutes, the second round is logical inference of numbers, the third round combines the first two round and we need to pass all of three and will get an phone interview.
The following proces:
1st round were games, including mental math, memory games
2nd round was hr interview, asking questions about motivation
3rd round: technical interview
4th round: technical interview
5th round: at office
I only got past the online assessment and got to the first round which was a HR interview. The online assessment involves 2 tests, probability questions and one with some form of games which test your reaction time, your thinking etc. it was quite fun to do
Interview questions [1]
Question 1
One thing they asked was my experience/what I did for trading. Unfortunately, I had no experience within trading.
80x8 Test : mental math exercise where I had to solve 80 short arithmetic problems in 8 minutes without using a calculator or paper. The questions are usually simple in structure—typically involving addition, subtraction, multiplication, or division of small numbers
Interview questions [1]
Question 1
80 short arithmetic problems involving addition, subtraction, multiplication, or division of small numbers but also fraction and small equations