First contact was with the CEO about doing a HackerRank screen. I did well on the screen and was asked to schedule a shared screen pair programming exercise with an engineer who works there. I suggested dates and times and received no response. I made contact once more and got no response. Several weeks later with no prompting the CEO talked about rescheduling the pair programming. We scheduled a time and date about when to do the screen (2PM) he sent a schedule confirmation for the wrong time (3PM), and didn't respond when I questioned him about that or any other questions. Very unresponsive, which should be a huge red flag to you. Finally did the pair programming about five weeks after I completed the HackerRank screen and flopped. The job description clearly states "current strong C/C++ skills or the desire to become an expert", but that's deceptive. You will not pass the screen if you aren't fluent in the C++ STL, so don't waste your time if you aren't a strong C++ engineer. My interviewer took some other calls when he was on the phone with me without telling me what was happening, which is pretty rude. However, I doubt I'll really remember that from this experience. I'll just remember it taking me about a month to schedule an interview and being ignored by the CEO.

I applied online. Got a call with their head recruiter same day or day after but it was very quick. After that was a hackerrank with 6 problems and 1 multiple choice. The problems were not that difficult if you're pretty familiar with the STL, but you do have to move pretty quickly. I think I was allowed 90 minutes and I used almost all of it. Second round was with one of the developers on the team. Again, the problem here was not difficult. I had to fix a memory leak and a list of objects being sorted in the wrong order. They're also looking for if you can tell why the memory leak occurred. I was able to fix the code but couldn't give exact reasons as to why the leak occurred so I think I got dinged here and didn't get to move on to the next stage.