Fairly simple STAR format. Practice a few relevant stories that you can pivot depending based on general behavioral or situational questions. I would advise ending the interview asking on timelines, as it's not always Boeing's strongsuit for job placement.

First round was a basic screening with an HR rep. I was invited to an on-site round with the Hiring Manager, another manager, and the lead. I don't remember the questions, but I remember that they were not hard. The interview was relatively easy. I received an offer, accepted, and worked there for about 2 years.