I have been working at Ipsos full-time (More than 3 years)
The laws of human nature dictate that if you have a bad experience you will tell 10 people but if you have a good experience you might tell 1 person. Glass Door is absolutely set up to be a total showcase for complaints. If you really want to get to know Ipsos, talk to the thousands and thousands of happy and long-term current employees.
In North America, we just celebrated a guy today in our Town Hall who has been with the company for 45 years. The standard length of service in the US and Canada is very long. I work with many people who have been here 20+, 15+, 10+ years. Obviously these people are very happy (as am I) and committed to Ipsos!
Paris may have problems but each region is different and Ipsos in North America is a great place to work. Each year they improve staffing, technology, leadership and overall morale. Pierre has brought some amazing leaders on board and truly cares about people. Don't believe everything you read and talk to someone who actually works here!
Honestly, sites like Glass Door whose "reviews" do nothing but hurt companies and reputations have placed an unfair label on Ipsos, at least in North America.
Advice to Management
Keep doing what you are doing and don't waste your time responding to these angry former employees.
I applied through an employee referral. I interviewed at Ipsos (New York, NY) in May 2017.
The interview process was fairly easy. I was contacted by a recruiter and I did a phone interview. I was scheduled for an interview a few weeks after the phone interview in their new york office.
http://glassdoor.com/slink.htm?key=vQtbL Canadian Research Industry Honours Ipsos with Three Awards in Research Excellence.
http://glassdoor.com/slink.htm?key=vQtbD Alison Chaltas Joins Ipsos Marketing as Global President, Path to Purchase