The term AI engineer is now pretty well recognised in the field (
https://www.latent.space/p/ai-engineer), and is very much not the same as an AI researcher (which would be involved in training and building new models). I'd expect an AI engineer to be primarily a software developer, but with an excellent understanding of how to implement, use and evaluate LLMs in a production environment, including skills like evaluation and fine-tuning. This is not some dataset you can just bundle in software developer.