OPNET Software Engineer Interview Questions
& Process

So I had this 5-step interview process with OPNET. First, there was a quick 15-30 minute chat with HR. Then, a 60-minute technical call with an engineer. After that, I had to do a timed coding test at home. The fourth step was another 60-minute technical call to go over my coding test results with a more senior engineer. Finally, I spent a whole 8-hour day at their office in Bethesda, which involved product demos, two more coding tests, review sessions for those, more chats with mid to upper-level staff, and lunch. They seemed really focused on getting to know candidates thoroughly, especially checking academic backgrounds, like how the founders went to MIT and asked about my college GPA, which I found a bit surprising after being out of school for ten years. The engineers were all really smart and passionate about their work, some serious, some more laid-back. They mentioned if I got to the final day, they'd know if they wanted to hire me. But then it took them three weeks to get back to me, and my emails were brushed off, so I'm assuming it's a no. I felt they should have given a quicker response, especially since I took a whole vacation day for the final round.

So I had a first phone interview where we talked about my resume and they asked me some networking technical questions. Then the second round was a programming round. The third round involved a code review and more technical questions. I think the next step is probably onsite since I've only gotten to the third round and haven't heard back yet.

Had a phone interview that focused on TCP/UDP and general C++ topics, which wasn't too difficult. Following that, I had a one-hour test to complete a C programming assignment. The next step was a code review conducted over another phone call. In general, the process was manageable, but it required attention to detail. HR was very responsive.