Pros
The managers at HNTB will let you develop as much as you are willing to take initiative. You have the opportunity to work on some of the most innovative and largest projects in the country and with some of the best people. Compensation, benefits, and personal opportunities for growth are some of the best in the industry.
Cons
Depending on your manager, there may be a lack of communication or development. However, if you take initiative and talk to your manager about where you want your career to go, then you will be given these opportunities. In the recent past there have been some layoffs, but nothing out of line with what the rest of the industry (or any industry in the US) has experienced over the last few years during the Great Recession.