The first two interviews went smoothly. The last interview, which was a panel of four people, went horribly.

Staff seemed underprepared, and team members appeared to be looking over my resume for the first time during the interview.

They asked vague questions, making it difficult to answer sufficiently. Thirty minutes per team member was not enough time to decide whether someone is a good fit or to ask technical questions.

Having someone who is not an engineer interview for an engineering role this late in the process should never happen.

You have this piece of equipment to test (it could be any part of the car). Think of all the different conditions you have to check to validate its functionality.