Drupal Integration with JSON API

We need your help build a generic UI purchase path, in Drupal, over the top of a RESTful API. The generic purchase path will be exposed to various clients, who will be allowed to do everything from upload a logo (at the simple end of the scale), right through to full CSS override, script and tracking injection etc (at the complex end of the scale). Drupal will serve as the platform to manage user credentials and upload various assets for customisation. The main steps involved will be; 1. Architect the solution and setup/config the drupal instance on Acquia 2. Build out the html purchase path using bootstrap or similar standard scaffolding html architecture that is highly customisable via CSS. The sites must be responsive an adhere to current best practice conventions. 3. Integrate to the RESTful API to return products and prices, and ultimately purchase the insurance. 4. Create an elegant way to provision a unique url for each client (eg. subdomain). 5. Determine best way to set up new clients and allow access, including appropriate security restrictions for self service customisation. 6. Create a proof of concept, by using the above generic purchase path and creating 2 very different looking implementations - ie. chose 2 of our existing sites, and copy them in to the generic template, through CSS/JS and header and footer manipulation. You must have at least 5 years programming experience and be fanatical about making things easy for end users. You need an excellent grasp of front end development, drupal, and Restful APIs. Being physically located in Sydney or Brisbane is highly preferred. However, native/fluent English with an ability to work on Australia Eastern Standard time will be considered.