An Aggregation & Wrangling developer is responsible for collecting, organizing, and transforming raw data into a more suitable and valuable form for data analysis. They use various programming languages, data wrangling tools, and data modeling techniques to extract, load, and transform data from different sources. They also develop and maintain databases, ensuring data integrity and security. Their role involves handling complex data structures, identifying inconsistencies, and resolving them to ensure data quality. They also automate and optimize data processing tasks, collaborating with data analysts and scientists to make the data useful for business intelligence or predictive modeling.