[adrinavarro]

$200k and up, for a Senior Software Engineer, is something that's only "frequent" in the U.S. (and varying a lot based on specific locations). With rentals costing many thousands of $ a month, significant healthcare costs, a need to have a car for each person, and no safety net.

If your friend is earning around €100k in France and not even living in Paris, then they're in a VERY privileged position. I'd say that €110k in Paris, factoring in exchange rates, CoL & taxes, can be the equivalent to a $200k salary in SV. So it's hardly a downgrade.