I work on eukaryotes, so I am not very familiar with bacteria. Is it really this simple in bacteria where you can modify it according to a planned circuit and g

I work on eukaryotes, so I am not very familiar with bacteria. Is it really this simple in bacteria where you can modify it according to a planned circuit and get the results you expect? I can understand maybe generating simple behaviors like upregulating a gene or superficially influencing some aspect of its metabolism, but is it possible to get a specific tightly controlled response? Do we know enough about bacteria for this to work now?