Sumo Logic Front End Developer interview questions

Was approached by Recruiter, extremely friendly and then follow up with a member of team. Interview was mostly HR style, asking about experience and seeing how the fit was. Followed up with coding round that was an hour long. Very friendly interviewer, was a JS question and we spent enough time talking about both our experiences. Follow up round went downhill. Was given a tree traversal question and the interviewer was incredibly haughty and didn't do much to help move the interview forward.