Consistency
G11: If you do something one way, do it that way everywhere. If you call a function fetchUser in one place, don't call a similar function loadUser somewhere else. The difference will confuse every reader into thinking the difference is intentional. When there is no difference, there should be no different name.
Conceptual Clutter & Artificial Coupling
G12: Clutter is code that doesn't earn its place. Default constructors with no implementation, variables never used, comments that say nothing — all add noise and zero value. G17: Artificial coupling is when unrelated things share a location for the developer's convenience. Enums defined in a class that doesn't use them, utility functions placed wherever the developer happened to be — these force readers to hunt for things in illogical places. Every piece of code should live where a reader would naturally look for it.
Code Challenge
Standardize the method naming convention across the service class.
Key takeaway
Coherence is a promise to every future reader: when you see a pattern, it means the same thing everywhere.