I applied online. A HackerRank challenge was emailed to me a couple of days later, which involved a 24-hour time period to answer two coding questions.
The next round was a phone call with several team members.
HackerRank questions are around LeetCode medium difficulty. Not a lot of time is given, so be prepared and study in advance, especially recursion problems.
The following metrics were computed from 39 interview experiences for the Optiver Software Engineer (Internship) role in United States.
Optiver's interview process for their Software Engineer (Internship) roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having good feelings for Optiver's Software Engineer (Internship) interview process in United States.