Preliminary screening questions ("What is the minimum salary you are willing to consider?" "How did you hear about this position?") followed by a 10-15 minute phone screen with HR. I was briefly asked about my resume and given some general information about the company. The actual interview was an hour long, the first half with a group leader in molecular bio and the second half with a group leader in analytical chemistry. No other staff were present. The interviewers were polite and friendly, but the questions were pretty tough and I honestly was surprised that I got an offer. The official offer came about a week after interviewing but they said it could take as long as two weeks.