Hiring a Hexagonal Architecture developer is beneficial because they can create a flexible, scalable, and easily maintainable system. They understand how to decouple software from technology-specific interfaces, allowing you to swap out databases, UIs, or test doubles without affecting the core business logic. This results in a system that is more adaptable to changes, easier to test, and reduces the risk of system-wide failures. Their expertise can greatly enhance the longevity and adaptability of your software, making it a valuable investment for your business.