Last spring, Martin, a former intern and now a full-time team member at Team PubNub, developed a comprehensive blog series on creating a full-featured chat app using AngularJS, which included a significant overhaul of the PubNub Angular SDK in preparation for Angular 2. The guide covers essential functionalities such as sending and receiving messages, building an infinite scrolling message history, adding user lists with presence and typing indicators, and securing access with OAuth. It provides a step-by-step tutorial on setting up a PubNub account, implementing features like real-time typing indicators, and scaling the app using Channel Groups to manage an expanding friends list. Additionally, the series introduces updates to the AngularJS SDK, making channel management more accessible with fewer lines of code, ultimately equipping developers with the tools needed to create an engaging chat application.