Two people, each one at a time. first one is HR ask about some basic information such like why you apply for our company or salary requirement etc. Second one is the director who check you background and ask your experience about engineering work

Interview with two engineers, they did not seem interested in the answers. All other interview reviews on glassdoor are accurate, study the questions they ask the same ones. There is also a written quiz. Sample questions: mass balance, importance of mixing.