I applied for ZS through campus placement. The first round was based on aptitude,reasoning and verbal,conducted by Aspiring minds.The level was not too tough,not too easy. Second round was Group Discussion of 10 minutes.My Gd round went well,but don't know why they eliminated me. Next rounds were case study(based on SQL),behavioral interview(Guesstimate questions etc.) and HR interview(tell me about yourself,why ZS,puzzles etc.)

It was a 5 round process - 1. Aptitude test - Difficult and lengthy questions. 2. Video Interview Round - A total of 10 questions - 2 guestimates, questions related to database scalability, recursive relations in DBMS, etc. 3. Case Interview Round - You can expect questions on Database optimisations, writing SQL commands using 4-5 tables. 4. Technical Round - It was stress interview. The interviewer asked me the time to solve the questions and started the timer. Expect programming questions, guestimates, SQL questions. 5. HR Round - It was not a formality round like in other companies. Many students were out from this round. You can expect questions related to real-life situations and your resume.