Pros
Collaborative is a growing company that is made up of some of the strongest technology professionals I have ever worked with. The company puts the utmost value in client satisfaction and has built positive brand recognition in the Boston area. Employees have opportunities to stretch and grow especially if they show initiative and drive. There is a mix of cool projects and good ole fashioned staff aug just like at any consulting company but if you do a good job you will be recognized and have an opportunity to do cool work. Most of the employees are genuinely nice people which combined with the strong skills makes coming to work a lot of fun.
Kontras
The company has experienced some growing pains as they moved from 200 to 400 people and beyond. They are working hard to address these but there are certainly challenges. Also, assignments are driven by what is sold just like any other consulting company. This means that no every assignment is a perfect match but they will rotate people out for those that have "paid their dues".