Amgen Full Stack Engineer interview questions

my first round was with a guy from the U.S. no coding questions asked, we had a very good discussion about scaling and improving performance and stuff. But the final round was in-person interview with the most boring and iriitating person for "one and a half hour". he was super old school and the most wierd guy i saw in that building that day. i travelled 6 hours from my home town to take this interview. it was very frustrating, as he kept on asking questions continously for the whole 90 minutes. he was very difficult to talk with and his expressions while you are talking add more to your frustration