MathWorks Software Developer interview questions

I went through 3 phone interviews for the job of developing Simulink before getting rejected. I didn't really want this job because I was initially declined from another job at MathWorks and given this job position as alternative. Then, I decided to have a try. The first interview was to ask what my PhD researches are. The other two interviews were about technical questions. A lot of C++ design pattern questions were asked. Those things are not what I am familiar with because I never need to use them in my PhD research and I didn't spend time to prepare. Nothing related to my research, computer graphics, were asked, which makes them not seen my positive side. One unhappy thing is that they didn't tell me that I was declined until I asked the recruiter 2 months later. And the recruiter did not sound friendly when giving me the rejection news.