I met their representatives at a career fair. I was offered an interview the next day. None of the questions were unexpected; they were mostly behavioral ones that required me to recall specific situations. No technical questions were asked. The hardest question I was asked was "What do you expect to be doing in five years if you're not hired by Siemens." I think I fell in the trap because I answered that I hope to be working at a similar company in the industry. Don't do this.