The evolution of application design has shifted from monolithic structures to microservices combined with serverless architectures, offering improved scalability and maintenance strategies. This article explores the application of serverless microservices across various platforms, such as eCommerce, social media, and video streaming. For instance, while eBay and Facebook exemplify the transition from monolithic to microservice architectures to address scaling challenges, Netflix demonstrates the advantages of serverless microservices, which offload server management to providers and allow developers to concentrate on product development. The text includes a detailed guide on converting existing services to serverless microservices using PubNub, including creating event-based modules to handle data in transit, and emphasizes how this approach simplifies scaling and management while enhancing flexibility and efficiency in application development.