I received an email from one of the recruiters saying that they would like to move forward with my candidacy and sent me a link to a quantitative test powered by Hacker Rank. The email DID NOT specify the deadline to take the test. They did not bother to respond to my email asking what the test was about so that I could prepare accordingly. Since I did not know the deadline and had other interviews lined up I took this test at a random night (2 hours, 4 questions). As such the questions were not that difficult, but there were several issues with formatting, and they were some grammatical errors with the questions. Not to mention that I had no idea what to prepare for because the recruiter did not care to respond. A representative of Optiver had talked about how Optiver loses candidates to Microsoft, Google, etc., in a podcast with Hacker Rank. Well, if Optiver does not have time to respond to candidates and does not value their time, then you are definitely going to lose good candidates.