First received a link to a Hackerrank style online coding interview. There was only one question. It was not too hard but one needs to think carefully about optimal solution. Otherwise, timeout will be encountered. 10 days after completing coding part, behavioral interview is done with a HR style guy. Got rejected after the behavioral interview.

Talked to an engineer in Austin for the expansion of their New York office and equities trading. He took most of the time asking for work history and technical questions. He left about 10 minutes at the end for a fairly simple coding question but that's where the trouble started. The platform is extremely broken: - There's a checkbox to turn off autocomplete but it didn't work, the editor kept overwriting what I typed. - Compiler errors and warnings weren't highlighted in either the editor or the output window so I had to spend a lot of time squinting at line wrapped black+white verbose g++ output to find the line number for each error. - Segfaults didn't show what line they happened on so I had to spend way too much time bisecting with printf's to find the problem. - Printf also doesn't work because the environment doesn't have flush on newline enabled so even the bisection was harder than it needed to be. 10 minutes wasn't enough to deal with all these editor bugs so I failed. I sent them an email with videos documenting all this in the test environment but they ghosted me. I don't feel like it was a fair assessment of my abilities whatsoever and frankly they wasted my time. Optiver has a reputation for blacklisting candidates who don't do well so I would recommend not talking to them as long as they're using a shared coding web interface.

Highly Negative Experience, seriously quite negative. I applied online, they did resume screening. Then sent an Hackerrank OA having medium questions. Being a good programmer I cleared it. After that they scheduled a small 20 min HR interview and in that it was just my past roles etc discussion and what they are doing. After 3-4 days of that round, I received a rejection mail based on my profile. If they wanted to reject based on it, they should have done it before the whole process to save my time and efforts too. If I would have failed in technical interview I would have happily accepted and learnt from it, but rejecting based on profile after taking coding tests and efforts of candidate is just unprofessional.