The job duties of an entry-level big data Hadoop developer involve working with the Apache Hadoop framework. The responsibilities of someone in this career include customizing software to manage, store, process, and analyze large amounts of data. An entry-level big data Hadoop developer utilizes the Java coding language. In addition to programming, they may create a script for data querying, tracking, and analysis. A professional in this role usually works under the supervision of senior members of an information technology department.