A large data analysis developer designs, develops and maintains systems to analyze large sets of raw data. They use programming languages like Python, R, and SQL to write code that can process and analyze data. They also create algorithms and models to extract insights and knowledge from data. They work closely with data scientists and analysts to understand their data requirements and to deliver efficient solutions. Part of their work also involves ensuring data quality and integrity. They often need to optimize systems for better performance and scalability, and also comply with data privacy regulations.