TikTok Backend Engineer interview questions

General online assessment followed by phone interview. Online assessments were the most difficult part of the process, and involved multiple complex concepts. The questions were algorithm related, which makes sense for a backend role for their recommendation architecture.

I took the technical assessment, was extremely difficult. Lack of responsiveness from the hiring team. Questions are all 3 stars difficulty on hackerrank. I would advise revising all data algorithm and structures concepts before attempting the test