They first contacted me to do a HackerRank assessment, and after that, I took it. However, it was quite challenging, so I didn't advance to the next round.
I suggest you study graphs and 2D array manipulation.
A graph problem, like a LeetCode one.
The following metrics were computed from 21 interview experiences for the Optiver SWE Intern role in United States.
Optiver's interview process for their SWE Intern roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having good feelings for Optiver's SWE Intern interview process in United States.