Pros
FactSet provides excellent opportunities to engineers, starting from the moment they are hired, to move up both in title and in compensation. If you are willing to work, then you will be greatly satisfied with the company's willingness to make you happy. The environment is casual yet highly productive, and the management layers are nearly all previous engineers (right up to the president!) so managers understand the actual process of development, and are therefore very supportive and very efficient and insightful in their project decisions.
Cons
Because of the rapid growth of the company and the exploding demand for many of our products, nearly every group is overworked and/or understaffed. This sets a great stage for those interested in opportunities to step up and be noticed, but will severely unsettle those who are accustomed to "quiet" weeks.