Hardware Engineering applicants have rated the interview process at Optiver with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 49.2% positive. This is according to Glassdoor user ratings.
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Not too terrible. A couple rough questions but if you know a decent bit of one of the big three HDLs, you'll be fine. They did make it seem like the work/life balance for full-timers was pretty bleak.
Interview questions [1]
Question 1
Make a Finite State Machine that parsed a simple regex