A Large data set extraction developer specializes in designing, implementing, and managing solutions to extract large amounts of data from various sources. They use programming languages and database querying languages to retrieve complex data sets. They also ensure the cleanliness and accuracy of data, handle data storage issues, and perform data transformations. They work closely with data scientists and analysts to understand their data requirements and deliver suitable data sets for analysis. Furthermore, they are responsible for maintaining the efficiency and reliability of data extraction processes, and may also be involved in data security and privacy tasks.