Maintainable Go
Maintainability is less about clever patterns and more about the daily choices that keep a codebase legible.
Maintainable Go starts with small packages and names that explain intent. A package should have a reason to change, and that reason should be easy to describe in one sentence. When the sentence becomes a paragraph, it is usually time to split the package rather than add another layer of abstraction.
The second habit is to keep dependencies pointing inward. Handlers can know about services, services can know about storage interfaces, but the storage layer should not know about HTTP. This makes tests cheap and keeps refactors local. The goal is not purity; it is a codebase where a change has an obvious blast radius.
Finally, write the boring code first. Explicit loops, early returns, and plain structs are easier to debug at two in the morning than a chain of callbacks. Cleverness can come later, after the behavior is covered by tests.