PetSmart ETL Developer interview questions

totally 3 interviewers interviewed me. they started the interview by introducing the company first. Then ask me to describe my previous project. Once I finished introducing my previous project they ask me about 20 questions. All questions are data warehousing tuning questions. Since this is a senior position they need people with a lot of experience all questions are related to real work problems. I answered all questions and got the offer next day after the interview.