The terms "data scientist" and "data engineer" are sometimes used interchangeably and involve similar skill sets. However, the roles of data scientists and data engineers are appreciably different.
Data Scientist / Engineer Tasks
Perform and interpret data studies and product experiments concerning new data sources or new uses for existing data sources.
Develop prototypes, proof of concepts, algorithms, predictive models, and custom analysis.
Design and build new data set processes for modeling, data mining, and production purposes.
Determine new ways to improve data and search quality, and predictive capabilities.