Vantaggi
Pay is good, clients are well knows companies that may look great on your CV and grant you general experience you will rarely see in start-ups and even mid-sized projects. Developers are rarely underualified because of standartized interview process. Company pushes for diversity and open communication and it usually works out fine, people are friendly and forthcoming. KPIs are clear and getting a promotion is a clear goal.
Svantaggi
*This may apply to my specific project and not be a general trend* Company insentivises (at the very least, doesn't address) internal compenition betwen branches. You will be on a project where Capgemini teams from countries A, B and C are involved, all work in different timezones and topic of the day on an internal meeting of devs from country A will be "how do we look better than country Y to not get booted off the project" and not actual working topicsm which is quite depressing.