Pros
There are no pros to working at AECOM. Over the past few years they've systematically destroyed everything I liked about working there in the name of 'branding' and 'collaboration'.
Cons
As part of recent mergers, the company has begun 'harmonizing' benefits. This means taking the worst possible combination of benefits, to give the bare minimum to the employee. Office space per employee has been reduced 70% in the last year, vacation has been cut, holidays have been removed, and the overhead account has been slashed. At one point in time companies would allow engineers to go to professional events to sell the company brand, and network with the goal of getting projects. All professional travel has been slashed. There is no longer any kind of a budget for training, and earlier this year they even removed the plastic silverware from the break room to cut costs. I'd recommend that people avoid working for this company.