I applied online. The process took 2 months. I interviewed at Merck (Millsboro, DE) in Nov 2015
Interview
You actually get interviewed by three different people. Each person has their own unique questions about what you can bring to the company, and about your experience. The last person you talk to does not ask you any questions, she simply tells you about the job you would be doing if you are hired. Its a very long and interesting process.
Interview questions [1]
Question 1
The hardest question was what is your weakest trait that you have.