The webinar series covers the topic of full stack development, focusing on building a full stack application with NoSQL, Node.js, and Angular 2. The first two episodes cover bootstrapping a Node.js application with NoSQL, back-end application logic and data modeling. The third episode focuses on building a responsive front-end with Bootstrap and Angular 2, while the fourth episode adds permalinking capabilities. The final episode extends the stack to mobile devices using NativeScript, building cross-platform Android and iOS apps that communicate with the back-end API. The series is designed for those looking to learn about full stack development and bleeding-edge technologies.