I'm working in a codebase of 200+ "microservices", separate repos, each deployed as multiple FaaS, CQRS-style. None of it my choice, everything precedes me, many repos I know nothing of. Little to no code re-use between them.

Any trace of "business logic" is so distributed in multiple repos, that I have no possible use of LLM codegen, unless I can somehow feed it ALL the codebase.

I've tried generating some tests, but they always miss the mark, as in the system under test is almost always the wrong one.

I guess LLM are cool for greenfield, but when the brownfield is really brown, there's no use for LLMs.