I never worked in France, but worked in other countries in Europe. There is always an insider vs. outsider feeling when I used to work as a foreigner, especiall

I never worked in France, but worked in other countries in Europe. There is always an insider vs. outsider feeling when I used to work as a foreigner, especially not knowing the language. How is that in Paris ? I assume it takes a while to learn the language. Does it present barrier in workplace ? Do you feel assimilated in the workforce ?