Pros
The job is stable for the long term. Work environment generally nice, but depends on the project to a great extent. If you are in the right location you might get the chance to take part in big projects for big clients or the goverment. Learning courses and training are usually covered by the company and these are encouraged by management.
Cons
Since its a IT services supplier company, you might be switching from one client to another over the years, without getting the chance to specialise on a particular field. If you love the technical side of things, making your career here is difficult. There is glass-ceiling which is quite low, after that you either settle down or you switch to project-management. Salary is low in general Projects are not technically challenging for the most part. Most of them are maintenance, Greenfield projects are a small percentage of them. work/life balance is not easy, remote working (before COVID) is hard or close to impossible. After COVID things have change a bit, but 100% remote jobs are still rate.