Hi,
I can develop a website (backend) in Codeigniter. I've read all your requirements and ready to start.
I am professional Web Developer and co-owner of a web-development team with 17 years experience in CodeIgniter Development.
Apart from CodeIgniter I work with Zend Framework, custom PHP, CMS, e-commerce shopping carts, credit card integrations, mail applications, mySQL databases, CGI/PHP/Perl scripts.
If you are interested in my proposal, feel free to contact me and we'll discuss the details.
P.S. I can speak German