A man is walking past a large sign that says E.S.E. Electronics.
The man works at E.S.E Electronics.
We have no idea if the man works for this company or if he is doing something else.
Just because a man is walking past a large sign that says E.S.E. Electronics, doesn't mean he works at  E.S.E Electronics.
A man walking past a sign for a businesses does not mean that he works there.