LIA is a hyperlocal employability platform I'm building for an isolated coastal district in Brazil — think fixed retail jobs, gigs, and a reputation layer, all matched by proximity instead of routed through a national job board.
This post is about the implementation: the actual folder structure, the real RegisterUserUseCase, and the Argon2id decision — pulled straight from the repository, not reconstructed from memory.
The Clean Architecture folder structure
LIA's backend is organized in four layers, and the direction of dependency is non-negotiable: outer layers depend on inner layers, never the other way around.
backend/src/
