A Fusion Tables Developer works with Google's Fusion Tables, a web service that offers data management and visualization. They import data sets, ranging from spreadsheets to SQL databases, into Fusion Tables, creating interactive tables, maps, charts, and other graphics. They ensure data is correctly interpreted, visualized, and shared for collaborative work or public viewing. Developers also integrate Fusion Tables with other Google services or third-party applications using Google Fusion Tables API. They troubleshoot issues, maintain data integrity, and may also design user interfaces or tools for easier data manipulation and interpretation within Fusion Tables.