I applied through the career section of their website. I received an email from an HR rep to schedule a phone screening interview. It was a lot more than what I was expecting - basically 30 min of behavior-based questions. They told me at the end of the interview that I could go on to the next stage, which is a one-way video interview using this software HireVue.
It is awkward recording yourself on a webcam, but they (HireVue) give practice questions that I highly recommend doing as it can help you get used to the system, which is important considering they only ask 5-10 questions. The questions were general questions (why BASF, why this position, etc) and questions about my experience related to the position. There may have been a behavioral question or two in there.
About 2 weeks after that, I was invited to an on-site panel interview with 5 people. I was told that the questions would be behavior-based questions, but I’d say about 40% of my questions were technical.
About a week after, I got a call offering the position. I found the HR department to be very responsive. They reimbursed me for travel expenses very quickly, which was great.