Apple Sr Software Engineer interview questions

After 30mins phone screen I was invited for an in person interview at Apple Cupertino location. For in-person interview, I spoke to 3 technical engineers, 1 manager and a director one at a time. Director was nice and asked few cultural and behavioral questions and overall he seemed happy Manager was little rude, aggressive (pretending to have SJ attitude) and without evening knowing any details about my background and skills blatantly told me that this is not a 9-5 job and I need to work extra hours because they work as a Startup. Infact this gave me a idea that this guy is a paniker and don't enjoy solving problems. Two of the three engineers I spoke to were B grade guys, in fact after interviewing at so many big companies I realize that there are so many of these guys who would never hire a A grade candiate in fear of loosing there jobs. I have to a conclusion after interviewing at Big Enterprises ( don't want to name them) that its better to have a group technical round rather a single 1:1 round. One of the question was why Spring framework and why DI ? They also asked couple of brain teaser from KhanAcademy (LOL)