3.2. Naming Rules

Target	Rule	Example
Package	Lowercase, singular	com.tienipia.flowin.user
Class / Interface	UpperCamelCase	UserService, Pageable
Method	lowerCamelCase, starts with a verb	findByEmail(), createUser()
Variable	lowerCamelCase	userName, totalCount
Constant	UPPER_SNAKE_CASE	MAX_RETRY_COUNT, DEFAULT_PAGE_SIZE
Enum value	UPPER_SNAKE_CASE	ACTIVE, PENDING_APPROVAL
Test method	Descriptive naming permitted	should_find_user_by_email()

3.2.1. Class Suffix Rules

Layer	Suffix	Example
Controller	Controller	UserController
Service	Service	UserService
Service Implementation	ServiceImpl	UserServiceImpl
Repository	Repository	UserRepository
DTO Request	Request	CreateUserRequest
DTO Response	Response	UserResponse
Configuration	Config	SecurityConfig
Exception	Exception	UserNotFoundException