development of wordpress site with multiple categories of registered users and subscription content.

I am looking for an experienced web developer who can work in Wordpress to create a new site, accessible on the web and mobile, that will feature written content to be accessed via subscription. The site will require the following features: - design for eye-catching welcome page with entry points for two categories of users and links to separate "about us" and blog pages -registration forms for two different categories of users. -multiple pages with extensive text and image content, generated and exported from Pressbooks -ability to play and download -payments for subscription access to the paywalled content -downloadable content -blog page and update Twitter feed In addition, I am looking for: -Someone willing to respond to questions/requests for a period of up to several months after the site is operational -well - documented code that can be turned over to project staff to update and maintain.