I applied through an employee referral. The process took 4 months. I interviewed at IBM
Interview
The interview question are more about what you have done in your previous work rather than get you to the white board and let you solve a problem in 5 minutes. So if your background match their requirement in general the interview process is not hard
Interview questions [1]
Question 1
one guy asked me very textbook style question, such as what is the relation between material bandgap and refractive index. I have completely no idea