In my job place there is a software that save all homepages and links that I open/visit. May somebody with the link of my project ou tasks see the contain of my project?
As with any service, the only way someone has access to your projects and tasks, and information in general is if they have your account username and password.
So no, there is no way anyone can access your information. We are also hosted on Amazon Web Services, one of the world's largest hosting service trusted by many corporations. You can read detailed information about AWS' security measurements here: http://aws.amazon.com/security/