This company is not worth your time. First I finished a coding challenge which was emailed to me. It included the ternary tree like many others have mentioned. Then two or so weeks later they scheduled a phone interview for me. The interviewer had me do one coding question in a shared document. The man interviewing was incredibly rude and had no patience for me. I've interviewed with top companies and have had success with many interviews, so I know I'm not one of those hopeless candidates. In fact, I feel that I answered the coding question well and accounted for many edge cases. The interviewer responded to one of my questions so rudely I almost wanted to hang up the phone right then, and I really should have. I was rejected within two hours following the interview.