Drupal 8 Module with One Page (Ajax) Form

I need a Drupal 8 module which implements a one-page ajax form. I've attached a description with some attempts at screen mock-ups. Briefly, the requirement is: - Present a list of words and phrases - If one is clicked, perform a search_api search and display the search results - For each search result, have a "match" button - If "match" is pressed, remember the node ID of the search result against the word or phrase that was selected - When the page is saved, report the phrases and the node IDs linked to them into the system report log In summary, the majority of the work required will be to build a form, perform some javascript/ajax and then present some additional form elements. The ajax form performs more ajax to fill hidden form fields, and eventually the form is submitted. The exact CSS styling is not important, although some CSS styling will be required (and I should be able to CSS style your work once you've handed it over). There is a documented problem with Drupal 8 with "ajax on ajax forms", which you'll need to be aware of. Non-Functional Requirements I'd like easy to read/maintain code, ideally with some tests (I don't need 100% test coverage, but would like tests over hard-to-reach and critical code where possible). I'm happy to talk over any details that aren't clear in the brief, can answer questions as the work progresses and ultimately just require the code in a zip file or whatever.