Screening, take home test, review, final round. The recruiter, like typical Singaporeans, will not bother to notify you if you succeeded or not. Sounds like this job is just a ghost job, where they only want to collect your data. This job is also 50% support, and the rest is just updating their OpenGL codebase from immediate mode to modern version. Not very high-impact work. In the final round, the department head is also very rude and liked to interrupt your answers.