Tony Morris

yes I can do it in my free time, however I think it's not easy to find a Haskell job in Paris

Turn your current job into a Haskell one. Or more succinctly, a job in which you always use the appropriate tools for the goal. Haskell will probably fall out of that.

This needs some preparation and a somewhat favorable environment but this can definitely be done. Open a discussion on reddit r/hascalator if you want to discuss it

It can be mitigated somewhat by not hiring employers who are uninterested in efficiently and effectively solving software problems.

I bet that many employers don't even realize that #haskell is a viable alternative, this is why we need to make the case for it

Shouldn't it confer a competitive advantage and naturally emerge? Like in http://www.paulgraham.com/avg.html 

It does, in an industry where technical superiority directly correlates to economic advantage. Unfortunately, our industry is more nuanced. We tend to call the cases where this nuance is overcome, "niche."

That "Nuance" sounds like market failure.