NetApp Senior Software Developer interview questions

Was invited onsite after initial phone screen by the Hiring manager. I did not have much experience in the file system development and my resume showed it. I had infact developed a stacked file system and that was the only experience. The interview consisted of 4 engineers taking turns in asking me coding/technical questions. First interviewer asked me some questions about file system implementation and I answered from my experience. The second interviewer was the least knowledgeable among all in my opinion. He asked me how malloc works and when I said it calls kernel for allocating more heap memory when it is short, he was so shocked and started arguing with me about how wrong I was. 3rd interviewer bombarded me with 15 coding questions (reverse linked list, reverse string etc etc) and it was a cake walk for me. 4th interviewer asked me a question about sorting integers. When i started the answer with a insert sort linkedlist, the problem statement changed from a insert problem to a const array sort problem and wanted a me to say heap sort was the best answer. But he didnt hesitate to tell me that he wanted a discussion and not a memorized answer. Funny! The hiring manager was decent enough to call me and tell me that the team thought I didnt have enough file system experience and said he would recommend me for other positions. Didnt my resume already say that? So why waste my time?

Their phone interviews seem pretty easy. They focus more on the on-site interview, where you can be rigorously tested the coding skills, design skills, leadership skills.