I applied through college or university and the process took 4+ weeks - interviewed at OPNET in March 2012.
Interview Details – Applied online. Received a pre-screening interview than set up a phone technical interview. Was asked basic networking and coding questions. Then took a one-hour coding test in which I had to design a system to accept planes that are ready for take off and allow one at a time to take off based on priority. I did this with four different queues, each having a different priority. Reviewed this with a senior engineer. Asked performance questions, how I could have improved it, how I would have used a different data structure. Waiting for next step.
Interview Question – How would you implement a binary tree? Answer Question
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