First round hiring process. Meet recruiter at my school's career fair. They had us sit with two software engineers, both 45 minute interviews. First one was relatively straight forward, fibonacci, but the second interview felt like an underpressure interview, the interviewer was constantly trying to crack down on me, but it was to see how well i can catch corner cases, how well i can think on my feet.... I presumed... The question took all 45 minutes, he told me to Write a Big Integer API for java.