Applied through college career fair and was contacted one week later for a written test on campus. The test was not hard but was detail oriented and contains C/C++ and Linux questions. The C/C++ part of the test was mainly about concepts such as virtual functions and what are differences in C and C++, etc . There was a few coding problems in the end. A few was a little bit hard since I have't seen any codes like that since I'm only a second year college student.