A Hadoop Developer creates and manages big data applications, harnessing the power of the Hadoop ecosystem to process vast amounts of structured and unstructured data. Key responsibilities include developing data pipelines, optimizing data storage, and ensuring efficient data processing. Essential skills include proficiency in Java, SQL, and Hadoop tools (like HDFS, MapReduce, and Yarn). Typically collaborating with data engineers and analysts, Hadoop Developers work in dynamic environments focused on data-driven decision-making, with opportunities for advancement to senior roles or data architecture positions.