Difference between MLE , Data Scientist and Data Engineer

I am new to industry and I don't seem to find a proper answer to this question.

I know Data Scienctist is expected to model. Train models do Post Production Monitoring. Fine-tuning and maybe retraining. Apparently retraining involves a lot of beaurcratic hoops. Maybe some production .

Data engineers would do preprocessing, ETL , building Warehouse ,SQL queries, CI/CD. Pipeline and scraping. To some extent data scientists do it. Dont feel comfortable personally but doable. Not the best coder but …

data data engineer data engineers datascience data scientist difference engineer engineers fine-tuning industry mle monitoring production question retraining train