I believe they were unhelpfully commenting on your grammar.

They read "2 to 3 times less" as "-200% to -300%" instead of "33%-50%".

For the retirement bit, that's assuming that France's 110% of GDP debt or so won't balloon in the future and pensions won't be slashed by the time your retire.

Nope. I currently work for an American company. They pay me 144k euros (before taxes). This include retirements and social security.

Same job in France would be 65k if I negotiate REALLY well.

I don't know any dev doing 120K USD (105k EURS)__as a salary in Paris. I doubt there are many. If you want to make this figures, you need to be a freelancer, which means no job safety, looking for clients, and paying for social security and requirements yourself.

French salaries for dev are in the 30k to 70k depending of your level. 70k is rare. You need to be good. To be able to negotiate or have a rare skill.

However 120K USD is not rare in the US. I had proposals for 220k.