ByteDance Software Engineer interview questions

Online coding test followed by 3 rounds of technical interview, with last round being the manager. Managed to easily pass the first 2 rounds but somehow failed the last round with the manager.

Received email from recruiter to schedule a time based on my availability which is nice. Interviewer was friendly and asked about my past work exp and the technical questions revolves what I had used. Did the coding interview using HackerRank which I was not familiar with so lose some time debugging.