The author of the text is Carter Rabasa, and he wrote this blog post about building a real-time SMS and voice voting application using Node.js. The previous parts of the series created a scalable voting application that can process votes for events via SMS or voice and display the real-time progress of voting. However, there was no web interface for administrators until this part of the series. This tutorial uses AngularJS to create a simple web interface for administrators. It covers creating the beginning of a simple AngularJS app, routing web requests to it through Node.js, authentication using CouchDB credentials, and handling login with a RESTful API and the $http interceptor. The application interacts with the server via AJAX calls and checks for 401 errors to let the user know they need to log-in. The tutorial also covers building a RESTful login API and creating a view for the app.