Interface programming constructs describe the behavior of objects without specifying underlying implementation details. Interfaces in Go are powerful and can be satisfied implicitly, meaning that types can implement an interface simply by declaring the methods defined in the interface. This article presents the correct way to use interfaces in order to write maintainable Go code and follow the SOLID principles, such as interface segregation, which promotes the definition of interfaces that have a clear and focused purpose, reducing unnecessary dependencies and improving testability.