I applied online. The process took 2 weeks. I interviewed at Optiver in Sep 2020
Interview
Applied online, then hacker rank challenge was emailed to me a couple of days later which involved a 24 hour time period to answer two coding questions, next round was a phone call with several team members
Interview questions [1]
Question 1
Hacker Rank Questions, around Leetcode medium, not a lot of time given so be prepared and study in advance especially recursion problems
The interviews consisted of an OA, then behavioural, then technical and thena final round consisting of another technical, system design and behavioural. These last interviews all an hour each. I only got up to the first technical.
OA; quite long, 3 tests
Behavioral interview: just a short talk with HR, motivation,…
Technical Interview 1: fundamental CS, nothing more
Technical Interview 2: system design, very vague but just go with the flow
Technical Interview 3: live coding, still leetcode but optiver style is a very descriptive problem, but the main thing could be boiled down into only few lines