If you know someone you will not need an interview. It all depends on who you know and not on your real skills. Interview typically involves and IQ and English test, but the result don't matter.

Hr interview, exam, iq test (mostly for entry level positions) interview with direct manager, interview with the ceo. Fair but lengthy process. It will provide a great insight on the position and tasks required. So you will have a clear idea ahead if the vacancy suits you