A DBVisualizer developer designs, codes, tests, and maintains the DBVisualizer tool, a universal database tool for developers, DBAs, and analysts. They work on enhancing its functionality that allows users to manage a wide range of databases such as Oracle, SQL Server, MySQL, and others. Their role involves adding features for database connection, SQL scripting, browsing and updating database objects and data, comparing databases, and visualizing data. They also troubleshoot and fix issues, ensuring the tool's compatibility with different database systems and operating systems. They regularly collaborate with other developers, testers, and stakeholders, striving for continuous improvement.