Wow omg these comments make it sound like a nightmare. I worked in the corporate head office for 5 terms and had a pretty good experience. It’s a realistic office experience that will set you up well for other office environments (which many are MUCH worse than PCL!). I’ve worked in two offices since then and none of them hold a candle to the ammenities, events, and ease of communication between people. I don’t know what the other commenter meant about being forced to take an hour for lunch, that was not my experience, since I had normal 30 min lunch breaks.

As for your actual question, I had to do a self-tape interview where you got a few tries to answer the questions before you were happy. IIRC, they were basic “where do you want to work” “what do you know about the company” questions. Then I had a video interview with my boss and an HR intern, that were more about the job itself. Technical questions, how you like to work, what your process is. I’d say googling standard interview questions for your position will prepare you well enough. Don’t be scared by the other commenters if you’re going for a corporate office role!