First you are invited to take a test to assess your chemistry, molecular biology, and laboratory knowledge skills. The difficulty level is that of a general education science class with some job specific questions as well as some math. If you do well you get invited to an interview. You will be questioned by multiple members of their staff at different levels. They will quiz you on the science behind the skills you claim on your resume. They will ask you questions to determine if you are the right fit for the company's culture.