Developing an Interactive Website

We are looking to build an application to generate documents based on templates, which users will be able to modify through forms linked to these templates. The website, therefore, will allow a user to fill a form with various details through text inputs, selectable options, etc. The form itself must be dynamic and must change options based on previous selections. Using these options, the application will generate a document, where the text inputs are inserted in different places in given templates, selectable options result in different paragraphs being inserted, etc. Each form will allow the user to generate one type of document, and the focus is on building a system that will allow us to quickly create new forms for new templates

The application should also allow users to register and login (using SSO and other means), and should maintain a record of all the documents that a user has generated. Access to the forms must be restricted based on sign-in status, and the application must be capable of basic analytics.

Please provide examples of any previous projects that you may have worked on.