go go
I have worked on numerous large projects like this through private contracts over the last 8 years. However, his is my first try at Freelancer.
I am a well seasoned Architect and Coder of Web Applications. I'm assuming you are going to want to be able scale this, which means setting up for multiple servers behind a load balancer. AWS is probably your best bet, but I have worked with other providers as well.
I like to setup a local server (my PC), a test server, and a production server(s) so that all changes go through rigorous testing before being pushed to the production server(s).
We can go through your wireframes, have a discussion and start immediately.
Thanks for your time ... Tim