First-round technical phone screening.

C++/Linux questions.

Then some questions about how you will handle a specific problem, for example, how you will ensure that only 20 orders are placed to a stock exchange in one second.

Second round - online coding.

The interviewer wrote a small C++ snippet and asked me to explain the code and tell him how many times the constructor, copy constructor, etc., will be invoked.

Then he asked me to write C code for atoi.

C++ vector, constructor, push_back, copy constructor, vector dynamic growth, Linux - malloc how it works, virtual memory etc.