First stage with very basic C++ questions and Leet code medium The second stage with test assignment: The library on which I had to base my assignment task was very poorly documented with a small number of examples that don't follow the good practices required by the reviewer. Looks like nobody cares if it builds/installs properly either. The person providing feedback was also not aware of good practices regarding architecture and C++ repository structure. Overall if you are not familiar with the mentioned "library" most likely you'll waste your time.