I've took a look at the Matasano project.
It seems terribly interesting for me and it fits with my expectations.
Unfortunately, they recquire to work in their office, as an european (french) guy, I can't afford to move in America : I'd like to stay not too far from my family and friends if possible. I love programming / computer security very much, but I think I'd suffer from not seeing them anymore.
I'm looking for an french/european job, similar to the one proposed for Matasano Project. AFAIK, it doesn't exist...
I consider moving to America if it isn't possible, but I'd like to avoid that if possible.
In Europe I'd guess you'd be most at home in the Linux world. At the moment all the activity there is in virtualisation related companies, so I'd try to approach some of them and see if they've got something for you. I think NetApp is hiring in your area, but I'm not sure what exactly they do there.
You can also become a Vulnerability Reward Program bounty-hunter as a hobby for a while. If you manage to find some high-profile bugs and blog about it, work will probably also start coming to you.
Thank you for all those precious advices, it means a lot to me.
I'll start blogging as soon as I've got something new and interesting.
I need to show what I can do, I'm currently studying and I feel like I haven't a lot of opportunities to really show off my skills because the level of recquirements is not high enough, that's frustrating sometimes.
I agree that a blog could be a good solution, I also enjoy writing articles even if my English is not the best.
I'll keep you informed if you enjoy receiving news from random internet people.
I'll certainly think about some softwares I'd like to analyze during the next few days and start working on finding bugs/vulnerabilities/things interesting.