Pros
The workforce is really global is you'll get to work with a lot of European teammates. The commercial side of the business provides great opportunity for building foundations of knowledge that are necessary to go work at a smaller start up biopharma company Salary and benefits are all quite competitive
Cons
Bureaucracy exists at any large company, but at Sanofi it completely paralyzes entire divisions. Nobody seems interested in improving it, and has just given in to the archaic processes/systems in place. Performance development is spoken of but management doesn't follow through. Poor managers are left in positions they shouldn't have and it seems like senior leadership is more interested in doing their best to hide low performers than to address it and try to offer improvement opportunities.