It's more complicated than this. At a certain level of seniority, which most engineers are, the 35h/week rule do not apply anymore. There still are restrictions

It's more complicated than this. At a certain level of seniority, which most engineers are, the 35h/week rule do not apply anymore. There still are restrictions but it's really to avoid abuse (make sure you get enough sleep for example, I don't have the details in mind sorry). To compensate for the extra hours, there are extra days of vacations though, call "RTT" (Reduction du Temps de Travail = work time reduction). Here too, I don't have the exact number in mind, about 7 or 8 days / year --- enough that I don't bother tracking my vacation days precisely, as you can see ;) So the 35h/week rule is mostly for basic jobs, not for people working in high tech. That kind of situation is quite typical by the way: the French system is over-complicated with too many options and special cases. Foreign coverage tend to stick to the high level headlines (which is perfectly normal) and as a result people often have a distorted view of reality.