What experience do you have that is relevant to this project?
I can create a login to any website that uses HTTP POST. We can setup a simple UI for entering login details, but I can also setup a fancy UI with QR codes to signup pages or even a signup form within Kodi itself at extra cost if you like.
Proposal:
Very familiar with add-ons for Kodi, working with json API's, scraping websites and Python scripting in general. I've worked for the past 6 years creating quality add-ons for myself and others.