I applied online. The process took 2 weeks. I interviewed at Optiver (Adelaide) in Apr 2022
Interview
Hackerrank Assessment that was not very difficult but needed to be completed in a very short time. Behavioural video interview with basic questions answered using STAR method. Overall very technical.
Interview questions [1]
Question 1
Build a stack in O(1) complexity. The stack must be able to push, pop, and Inc I V where I is the i bottom elements in the stack and V is the number each of those elements need to be incremented by.
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.
They gave a long block of python code and wanted me to find the error in it, then wanted me to explain how I would make the system more scalable.
Application
I interviewed at Optiver (Amsterdam)
Interview
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