1. OA with 3 leetcodes and system design 2. interview with 2 engineers from different teams, before interview u will get a test in 30 mins. the questions are about operation systems and the test before interview. 3. behavior questions

**Pre-screen Test:** The pre-screen test consists of 5 tasks on Codility. Out of these, 2 or 3 are medium-level, but they have fewer test cases compared to LeetCode. You should complete them within 3 hours. **First Round of Technical Interview:** The first technical interview focuses on designing an instant messaging (IM) system similar to Line. The specific topic may vary depending on the team that has the HC. **Second Round:** The second round involves implementing a concurrent task pool, which is slightly more challenging than typical data structures and algorithms (DSA) coding problems. Unfortunately, I did not pass the interview, so I am unsure about the remainder of the process.