Developer needed for creating a Google Apps Script Add On

We currently have a proprietary Data API and we would like to create Google Apps Script Add On to act as a client for returning data from our Data API. There will be 3 main pieces to this project: 1. Front end Google Apps Script Add On (JavaScript, HTML, CSS) 2. Integration with existing Firebase implementation for user authorization / authentication. 3. Subscription plan based billing API integration with Stripe on our web-app user-portal back end Candidate should have prior successful experience building Google App Script Add Ons and building front ends that speak with REST APIs. Must also be comfortable integrating with user-portal back-end (used for subscription billing) which is built in Ruby and JavaScript. We're very organized and detailed oriented product managers. We're looking for a rock star developer to rapidly build out and deploy the features to help us get this product to market quickly. Please only respond if you're serious about the work, you intend to follow through on your commitments, and you have high standards for your work. Other key requirements: * Fluent in both written and spoken English * Experience and comfort with agile software development process * Availability once per week to conduct a Sprint planning meeting over video conference * Ability to follow and implement detailed user stories authored by the product manager * Ability and willingness to demonstrate completed stories by doing code walk through and feature demos * A willingness to consistently ask specific questions if/when you identify ambiguities or trade offs in your user stories Please read the following background information regarding the core technical skills needed for this job before applying: [login to view URL] [login to view URL]