This guide describes a mental model and a collection of patterns for developing software architectures. These architectures are easy to maintain, extend, and scale across the organization as product adoption grows. Cloud hyperscalers such as Amazon Web Services (AWS) provide building blocks for small and large enterprises to innovate and create new software products. The rapid pace of these new service and feature introductions leads business stakeholders to expect their development teams to prototype new minimum viable products (MVPs) faster, so that new ideas can be tested and verified as soon as possible. Often, those MVPs are adopted and become part of the enterprise software ecosystem. In the process of producing these MVPs, teams sometimes abandon software development rules and best practices, such as SOLID principles and unit testing. They assume that this approach will speed up development and reduce the time to market. However, if they fail to create a foundational model and a framework for software architecture at all levels, it will be difficult or even impossible to develop new features for the product. Lack of certainty and changing requirements can also slow down the team during the development process.

https://docs.aws.amazon.com/prescriptive-guidance/latest/hexagonal-architectures/welcome.html