Their interview process was divided in 3 phases. First I was asked to complete a numerical assessment, consisting on answering about 15 questions in 18 minutes. Two days later I had a behavioral interview over the phone. The second phase was another interview over the phone which was a little bit more technical. Third phase consisted on an assessment day from 8am to 1pm on their Houston offices. This was the toughest part. In general, their staff was very friendly and this made the whole process easier, although I didn't get the job.