More than a month after applying online, HR staff called for a screening and later arranged a technical interview after three days. I prepared well and answered all questions effectively. The person who interviewed me was nice, but he did not tell me how I performed. In fact, he said he would not provide any feedback regarding this interview process and that there would not be any follow-up if I failed. I don't know what I did wrong, but I've waited for a few weeks and heard nothing back from them. I am disappointed about the process. Please don't put too much faith in it, even if you seem to be getting close. They may be a big company, but they actually judge without much professionalism.

Topics include C++, digital signal processing, and some basic math.

The session will last about 1.5 hours.

C++ and DSP are really simple. There's nothing to worry about if you have solid knowledge of them.