A JDBC (Java Database Connectivity) developer is responsible for creating and managing connections between Java applications and databases. This includes designing, implementing, and maintaining Java applications that interact with databases using the JDBC API. They write SQL queries, procedures, and functions to retrieve, manipulate, and store data. They ensure data integrity, handle transactions, and manage exception handling using JDBC and SQL. They may also be responsible for optimizing database performance and ensuring data security. JDBC developers often work with other software developers to integrate database features into software applications and may need to troubleshoot and resolve issues related to database connectivity.