Optiver Quantitative Researcher interview questions

Process consists of an online test, phone interview, programming assignment and then on-site visit. The application must contain a cover letter and a solution to a puzzle on their page. Got autorejected after the test with a message that they only consider applicants in 98th percentile of the people who take that test - don't waste your time on the letter and puzzle if you don't have some ridiculously high IQ.

You first take a Hackerrank test with several math questions and a DP programming question. They give you 3 hours and the test wasn't hard; I finished in around 2 hours. Then there's a standard behavioral test. If you pass this, they invite you to an onsite. In the morning, you take a 30 min sequences test, followed by a 2 hour written test that is mostly probability. This test was difficult and the time was tight although I felt I did alright. Afterwards, there's a one hour technical - they asked me four problems that were all probability and brainteasers that are around average difficulty. I think I did well on it. Then there's a lunch with two quants and in the afternoon, they go over your test and there's a one hour behavioral where they talk about your prior experiences. I didn't get an offer but overall I had a positive opinion of the company, and the recruiting process was very streamlined and efficient.