It took me about 1.5 hours.

It basically started with a team introduction and who does what.

Then I talked about my CV, my past projects, and experiences.

I was asked to describe some of the technical difficulties in one of my projects.

After the talking part, the technical questions began, measuring my knowledge of C/C++, memory management, sorting, different data types, etc.

Different memory types in C/C++

How are strings (arrays of characters, not std::string) stored in C/C++?

Sorting a huge amount of data of different types (16-bit int, 8-bit int, binary), algorithms, and their Big-O analysis and optimizations.