2 hour long online coding tests, 2 hour long calls. The first coding challenge consisted of rounds of about 70 questions similar to an IQ test, followed by 7 super short "find the bug, change 1 line" style questions. Super basic, don't be hindered if you don't understand the IQ test questions, they seem to be a super low level gauge of problem solving. The second coding challenge consisted of about 30 general personality questions, and 2 longer coding problems. About 20 minutes per problem to get a good solution. I had errors in mine and still got the phone screen. I received 1 phone interview, started with about 15 minutes of general personality and work experience questions, as well as basic data structures. Literally define data structures, differences between them, and implementations ( ex: which data structure would you use to implement depth-first search?). Maybe 1 graph question was included, but did not go much deeper than that. The basic questions were followed by 1 programming question, where you talk over the solution with the interviewer then write up the solution in a collaborative text editor. The last couple of minutes you ask the interviewer questions about the company.