A nice overview. In short, I would describe an AI Engineer as someone who integrates existing AI tools and libraries into a reliable system that is fielded in a production environment. They also must know how to tune AI components and assess them for performance, decline/drift, and failure. Most AEs have a MS or less (CS, data science, statistics, etc), since it's not really a research role. Finally, AI Engineers don't invent AI tools or fix what's missing/broken within them. That's the role of an AI scientist.