Defects in Software engineering are a common occurrence. To mitigate defects the developers must create maintainable solutions and strive for good software quality. A maintainable solution is readable, extensible, not error-prone and testable. In order to make them so developers follow a guideline called SOLID principles. These principles are not enforced by the language but relies on the diligence of the developers, meaning there is nothing stopping them from writing unmaintainable code. This study translates these principles to Functional programming to investigate if Functional programming can be used to construct a library for servers that forces the developer to create correct code without incurring costs in maintenance and readability.