I worked at Clark Construction Group full-time (More than 3 years)
If you like taking initiative, learning on your feet, and being given real responsibility right from the get-go then Clark is a great place to work. My resume after three years rivaled that of people with 5-8 years of experience at other companies.
Lack of flexibility with working hours. People there are definitely proud of working hard, but sometimes that extended into being in the office at all hours unnecessarily when they weren't busy - just to be there, which created expectations for everybody to do the same. Let's just say that leaving ANYTIME before 5:00, no matter how early in the morning you started - was met with some judgmental looks.
I applied through college or university. The process took 2 weeks. I interviewed at Clark Construction Group.
After talking with Clark at my university, I was invited to their office. When I arrived, I met with two employees (one of whom was a last minute addition). Neither interviewer seemed particularly enthusiastic about their work and one even asked why I wanted to work in "such a high stress industry." In between interviews, I was left alone in a conference room for 40 minutes. I then went on a site visit where many of the management team I met with seemed hesitant about talking about their position in general or spent most of the time talking about negatives. Compared to the other 5 interviews I had in the area, this was by far the worst.