An Accumulo developer designs, implements, and maintains software applications using Apache Accumulo, a sorted, distributed key-value store. They leverage Accumulo's robust, scalable data storage and retrieval capabilities to handle large data sets effectively. They ensure data integrity, security, and privacy by utilizing Accumulo's cell-level access controls. They also optimize database performance, troubleshoot issues, and develop custom iterators. Furthermore, they often collaborate with data scientists and other stakeholders to understand data needs and deliver suitable solutions. Continual learning about Accumulo updates and other relevant technologies is also part of their role.