I am a data scientist. I use statistical learning techniques to increase value of corporate data assets through prediction and discovery. The methods I use are based in computer science, mathematical statistics, and probability theory. Some people mistakenly categorize “big data engineers” as data scientists. These engineers typically are system architects who use tools like Hadoop and more recently Spark to build out infrastructures to process enterprise data at scale.
To read about all the points in depth, please refer to Types of Job Roles Available in the Field of Data Science