Computer Packages interview questions

In person writing interview with several problems, then a few following rounds for talking with people in different teams. The whole process of the interview is in one day, and the result is pretty quick.

I applied through Handshake and got a response really fast through email. They only do in person 3-4 hour interviews. I talked to around 3-4 people and at the end there was a written test that took an hour. It seems like they want people who are highly skilled and are not flexible with those who may need to learn on the role (for example, a particular language).