I had an initial phone interview with the human resources person. My second interview was with the human resources person and the department director. The director asked all of the questions and the HR person took notes. After the interview I took a skills assessment. The skills assessment contained math questions and some technical questions (ex. What is stress testing? What is a denial of service attack?). The third round of interviews was with the CEO and CTO. They asked me about my work history, my understanding of the position, and my commitment to the company.