First, there was an introductory call from HR that lasted 20 minutes. This call covered general questions about background, GPA, visa status, etc.

I then received a HackerRank link with two C++ coding questions based on classes and strings. You could choose Java or JavaScript instead.

Next were multiple-choice and math questions.

Another section involved either MATLAB or Python.

After this, I had a 30-minute managerial round on the call.

I received an email to schedule a 20-minute discussion about the further process (on-site scheduling).

I am still in the process.

Basic OOPs, data structures, differentiation, and DSP concepts like convolution, etc. You can also choose OOPs/embedded/controls instead of DSP. C++ coding, MATLAB/Python concepts.