I applied online. The process took 2 weeks. I interviewed at Optiver (Chicago, IL) in Oct 2019
Interview
Coding Challenge with two problems which was pretty easy and I passed all of the test cases. Next was a behavioral interview that seemed to go well and was very casual. Then I received an email that I was no longer being considered, which was confusing.
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