TikTok Backend Engineer interview questions

3 rounds of interview. First round: Interview questions related to: Projects discussion. Msg brokers, Different types of concurrency handling, Locks, Data pipeline processing. Leetcode question was fairly easy: reverse a binary tree Second round: Project further discussion, Previous internship experience. A lot of network questions. Os questions: Mainly focused on memory management. 3 leetcode questions: 1 hard. 1 medium and 1 SQL. Third round: Interview with hm. Discussed about recommendation archetecture. 1 long medium algorithm question.

Multiple rounds in a day, Resume deep dive and one technical question each. Technical questions are medium to hard difficulty. Also asked CS fundamental questions on OS, databases and distributed systems.