I applied online. The process took 1 week. I interviewed at Optiver (Sydney) in Feb 2020
Interview
Online hacker rank test with about 8 questions. 3 were general hacker rank programming, and 5 were about puppet and bash scripting, which required you to use your command line. Test was 3 hours.
I applied through a recruiter. I interviewed at Optiver (Amsterdam) in Dec 2024
Interview
Clear process, although long. Expectations always managed and very valuable feedback along each step. The recruiter made sure I could be my best self and prepare myself for each step properly. The interviews themselves were also very interesting and a great challenge, in my opinion. Also accommodated to my schedule which was great.