That seems about right to me. In Paris I know several people getting about 42/46 at the same level of experience. So 44 outside of Paris is not bad at all.
Although, there is a huge disparity. There are some opportunity at 70k in Paris for 5Y of experience..
I mean where i'm is not as expensive as Paris, but still, after rent I'm left with ~1800€
And I don't see any big breaks coming when i look at the salaries of more senior people around.
Also, French company are not very good at giving what you’re worth. They are kind of strict on the salary range given some amount of experience.
But if you are good, you can either get the top 10% of salary, or create your own company.
The top 10% don’t advertise much about what they have, but it exists. You can reach 100k level in France. (Not with only 3y of experience of course)