Pros
Great people, interesting projects, and plenty of work! You'll have opportunities to get your hands in a handful of projects and learn with some of the brightest minds in the industry. Offices all over the country allow you to relocate and set up where you like. The majority of people and managers genuinely care about you and set you up to succeed. Potential to excel and promotions do exist, but tend to benefit the senior level and up. Excellent benefits and stability - if you work hard you may not feel appreciated or fairly compensated but you'll always have a role. The Geosyntec name still holds merit, this is one of the top consultants in the industry.
Cons
Consulting industry tends to be overworked and/or underappreciated. Work/Life Balance tends to be an underlying issue across all offices and positions. Geosyntec tries to act like a small firm, however they still have many corporate characteristics of the large firm that they now are, and those usually don't end up to the benefit of employees. They have gotten better recently but Geosyntec is still fairly top heavy with too many cooks in the kitchen at the senior level and not enough staff level positions to perform the work. Effect is that the Entry/Mid level staff usually has to pick up the slack and tend to get overworked. Geosyntec values and billing rates represent them being the best, which is great, but employees are not fairly compensated in my opinion to prove that mission statement true. Turnover has become an increasing issue in recent years as employees are looking elsewhere out of the industry all-together.