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Golang / GoLang Production Patterns and Web Standards Interview Questions

What is the recommended project structure for a production Go service?

Go does not mandate a project layout, but the community has converged on a practical structure that separates concerns without over-engineering. The key principle: packages should be named for what they contain, not what they do.

myservice/
├── cmd/
│   └── server/
│       └── main.go          # entry point — only wires dependencies
├── internal/                 # private packages — not importable by other modules
│   ├── api/                  # HTTP handlers and middleware
│   │   ├── handler_user.go
│   │   └── middleware.go
│   ├── domain/               # business logic — no infrastructure dependencies
│   │   ├── user.go           # User type, UserService interface
│   │   └── user_service.go   # UserService implementation
│   ├── store/                # data access layer
│   │   ├── postgres/
│   │   │   └── user_store.go # postgres implementation of UserRepository
│   │   └── memory/
│   │       └── user_store.go # in-memory implementation for tests
│   └── config/
│       └── config.go         # configuration loading and validation
├── pkg/                      # reusable packages (can be imported externally)
│   └── httputil/
│       └── response.go       # writeJSON, writeError helpers
├── migrations/               # database migration SQL files
├── docker/                   # Dockerfile, docker-compose.yml
├── go.mod
├── go.sum
├── Makefile                  # build, test, lint targets
└── README.md

// Key decisions:
// internal/ prevents external packages from importing your internal logic
// cmd/ can have multiple binaries (server, worker, cli)
// domain/ has NO imports from store/ or api/ — dependency flows inward
// Tests live alongside the code they test (*_test.go files)
// main.go is thin — create, connect, start; no business logic

What is the purpose of the 'internal/' directory in a Go module?
Why should the domain/business logic layer have no imports from the data access or HTTP layers?

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