There are not that many companies using prolog code, but specialized AI companies still do. I've worked as a consultant programmer developing large decision-support systems for engineering projects and the bulk of the domain logic was written in prolog. Most operational stuff was in C++ or Python, still, so even in that project there were as many jobs for Python programmers as there were prolog programmers

You don't truly appreciate the declarative paradigm until you are able to describe (and find the best among) all billions of complex possibilities of configurations of nuts and bolts following all these engineering laws, practices and rules of thumb... in a hundred lines or less

I love Python and I'll introduce myself as a Python programmer, but part of me will always have a deep respect for prolog and how utterly awesome it is in the right context