I met the first recruiter at a career fair through my university. We scheduled my first interview for the next day and talked a little about the company and what the job entailed. It seemed to me that basically as long as you were ok with the fact the job was like 85% and working in on outdoor job sites for long periods of time and seemed somewhat motivated, then you were qualified for the next stage of the interview. For the second interview they flew me out for 2 days to Houston. We visited the headquarters there and toured a natural gas facility where they do some work, got to meet lots of people who do the same job and run the business operations in different regions around the US. We went out to a nice restaurant for dinner, where you need to make sure you sit next to one of the people who will be interviewing you the next day and take advantage of your opportunity to socialize with them. Then the next day was a 3 round interview process. We got called in from the breakfast area to another conference which had a bunch of tables walled off by curtains, each one with a panel of 1 or 2 people interviewing 1 person at a time... so pretty distracting noisy environment. Part of me suspects it tests your ability to concentrate with a lot going on around you, such as you might experience as a field service engineer in a construction environment. The interview questions were still mostly personality questions to see if you're a good fit for the demanding work lifestyle, with a few obscure basic engineering questions to see if you can think on your toes under pressure.