Had a brief phone interview that involved a discussion of OOP and writing code in C++. Was invited onsite, where there were a series of interviews, each one-on-one. One was a C++ code review. Another was about designing a game/simulator and addressing its challenges. The third focused on data structures and algorithms. The experience was mostly positive, and I heard a decision less than a week later, but I have yet to receive the promised travel reimbursement. I can understand a delay in this process, but no one from HR has replied to my inquiries about it. Very unprofessional.