Amazon Firestick WASK Template modifications

We are a team of developers and we need a firetv expert to modify Firetv's WASK HTML5 template to work with our json api. We have a CMS that we use to manage and create video playlists, and VOD lists. we have our own channel management CMS separate from wordpress with its own api. So the way this works is our video management cms manages the video playlists and the VOD for our customers (each customer with their own user and pass to our video cms) and the videos are displayed on to varies apps the way the customer selected in our video cms. This will be ongoing work. Please make sure you are experienced in Firestick and HTML5 The bottom line is we want our api to display correctly into the WASK HTML5 firestick template. I do NOT want to work with an agency I want to work directly with developer