I applied through an employee referral. The process took 3 weeks. I interviewed at PerkinElmer (Waltham, MA) in Apr 2014
Interview
First round is HR - simple basic questions.
Second round is phone interview. Was asked to solve some coding problem.
Third was onsite. resume questions, academic projects, basic programming questions.
There was a drug test after the final offer. And then within few days I started with my internship.