I was contacted by phone and invited to an interview at the refinery after my application on the company's website. Sicilians are chilled out people, so while the interview was scheduled for 9am we started at 10.30am, perfectly normal. No group interviews. First step: with 3 young process engineers of the refinery. They require a complete explanation of your CV, from university to part time jobs (I worked in a clothes shop) and other interests. Behavioral questions were mainly about the PPEs you need while on site, how to convince operators with 10+ years experience to follow the instructions of a newbie engineer. Technical question was based on a PFD. Straight run naphta from atm distillation is sent to a first stabilizer where C6+ are recovered from the bottom and sent to another stabilizer where the heavy ends of the naphta cut are removed. Top of the second stabilizer is sent to a Merox reactor, which requires a C5 concentration in the order of 10ppm to work efficiently. Analyze the causes for which one morning you see 20ppm C5 at the Merox inlet and how would you solve the problem. Second step: with a manager and an HR. Complete explanation of your CV. Just behavioral questions. Would you stay in Sicily for 10 years or all your life. Where do you see yourself in 5 years. Same question about giving instructions to operators. Third step: with another manager and the plant director. Toughest interview by far. They want you to express total motivation for the job and for a flourishing career in ExxonMobil, willingness to sacrifice, knowing it's not just a 8-17 job. Explain the differences between leader and supervisor. Preference to pursue a technical/managerial career. I would rate the interview process difficult, mostly for the stress of three long interviews (1h30m per step). I didn't get the offer but overall it was a very positive experience, it's been a great training for my following interviews in other refineries.