Oxygen Development Process Engineer interview questions

Applied through a job posting social network, received a call next day to schedule an interview, got hired 3 days later after completing medical and psychological tests. Initially there was a panel with the General Manager and the Process Unit Manager and a HR Representative asking different questions and was more a conversation type interview, rather than direct questions. Then the HR Representative called back to schedule a second and final interview where the offer was made after completing the psychological tests, between those dates, I was asked to perform a drug test at a selected laboratory.

very brief. met with people that were clearly not knowledgeable. they were trying to impress with big words but had no concept behind them. HR person was nice, other interviewer was friendly as well