Hello Juan,
I'm and independent web developer, I handle the full stack, but to be honest my weakest point is the actual design, I can do CSS and graphics but I prefer to do actual coding. I can handle JS, PHP, MySQL and the relevant frameworks. I build web applications, maintain them and add features.
The page you linked could not be shown, just the login.
I would really like to speak more about the project, I think I can help out.
Thanks for reading, regards.