I applied online. I interviewed at Optiver (Sydney) in Mar 2023
Interview
The coding OA was quite challenging as it presented two Data Structure questions within a span of two hours. Although I couldn't fully solve either of them, I found the experience to be highly demanding. The first question seemed to require the implementation of a Segment Tree for a solution. As for the second question, I was uncertain and couldn't determine the appropriate approach.
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