The document discusses architecting applications for DevOps. It begins by describing traditional monolithic architectures and their limitations in scaling. It then introduces microservices as an alternative architecture that is more modular, independent, and scalable. The key advantages of microservices like ease of deployment, reliability, and scalability are discussed. The document provides guidance on designing microservices to be independent, have separate data stores, and use containers. It argues that microservices and DevOps principles like continuous integration/delivery work well together by simplifying deployment and maintenance. The document concludes by discussing how microservice architectures can better handle sudden traffic surges using DevOps tools and cloud platforms.