Two rounds of phone interviews, both technical. Then the onsite is a few rounds of 1-1 interviews within one day, including one with the hiring manager. Overall experience is very good, interviewers are professional.
Interview questions [1]
Question 1
C++ questions
Algorithms, e.g., all subsets of an array
Estimate effort of coding a specific algorithm
I applied through an employee referral. The process took 1 day. I interviewed at Sabre in Nov 2015
Interview
I got the interview for Senior Operations Research Analyst. There were two rounds of phone interview. The first interview is about Operations Research questions, eg decompostion method, how dose column generation work. The second interview is about programming in c++, mostly object-oriented part. They are require experience with class, version control and etc.
I applied online. The process took 5 weeks. I interviewed at Sabre in Oct 2014
Interview
I applied Sr. operation research analyst position via online (sabre webpage). They called me back 2 month later and we had three phone interviews.
Interview questions were quite difficult. They asked many high level C++ questions and I could not answer correctly.