An IndexDB developer designs and implements browser-based database systems using IndexedDB API. They handle data storage requirements for high-performance, real-time web applications, allowing operations even in offline mode. Their tasks include creating database structure, reading/writing data, managing transactions, indexing for efficient data retrieval, and error handling. They ensure data integrity and security, often working with other web technologies like , JavaScript, and Web Workers. They also perform testing, debugging, and optimization for seamless user experience. Their role is crucial in creating scalable, responsive applications, often for e-commerce, gaming, or data-intensive platforms.