An ETL (Extract, Transform, Load) Developer is responsible for designing, building, and maintaining the data pipeline infrastructure that enables organizations to gather, process, and analyze large volumes of data from various sources.

An ETL developer performs the Extracting, Transforming, and Loading processes. They are involved with extracting business data from a diverse source system and then transforming the data (such as calculations, combining it, applying, and ensuring quality) and loading the transformed data into a data warehouse system in a safe environment.

An ETL Developer is an IT specialist who designs data storage systems, works to fill them with data and supervises a process of loading big data into a data warehousing software. What’s more, it’s ETL developer who’s responsible for testing its performance and troubleshooting it before it goes live.

The responsibilities of ETL developers include designing, building, automating, and maintaining sophisticated programs that extract, convert, and load data. They are highly skilled and help in determining the company's storage requirements by performing multiple analyses.