1. CodeSignal: I scored around 845/850, I think. The questions were very easy, but I lost 5 points due to time. I don't know if the score matters too much, but I guess you probably have to be Level 9 or Level 10? You can look up the tiers.

2. Phone interview via third-party company: I actually preferred this a lot more than the usual process. The third-party interviewer specifically conducts interviews (i.e., he's not a Robinhood engineer), so he was very professional and explained the problem clearly.

3. Three onsite rounds: People were polite. Like the other review here, I also had one very aloof interviewer who said nothing the entire time (even when I asked for a problem clarification) and seemed very disinterested when she asked about my background. She wasn't mean or rude, though. The other interviewers were very friendly. The questions were not bad. One LeetCode question, one coding question (not algorithms; just testing your ability to write a function that does something tedious, like parsing a string and putting it in another format), and one system design question. I've never taken classes on OS/distributed systems and definitely haven't worked with that kind of thing before, but I thought the system design question was very reasonable and easy. I just watched some YouTube videos and read blog posts to prep. The LeetCode question was also okay, probably LC Medium, although the question is not available verbatim online. Broadly speaking, it tested recursion and data structures.

I signed an NDA, sorry folks.