Pros
Great for young engineers to start career, as there are many opportunities to work on signature bridge projects around the US and Canada, as well as potentially around the world. B&T (now COWI North America) is a sister company to COWI in Denmark, which has many other sister companies. You might get a chance to work in the UK or Denmark if you are the lucky few that show interest and get selected when work is slow here or needed for a project there. Lots of work sharing between offices. Opportunity to develop and connect with people in offices around the world. Great benefits. Upper management adapts well to employee surveys. Flexible work hours. Transparent.
Cons
Lays off good employees, which affects employee morale. Somewhat chaotic management at times. Work can get monotonous for some engineers, so you should have a clear career path/goal and request type of work you want to work on. Yes men/women are highly appreciated by them, but are often the ones left behind if you don't have a good Head of Section/Group Lead.