A DBISAM developer works with DBISAM, a database management system designed for small to medium-sized applications. They design, implement, maintain and troubleshoot databases using DBISAM, ensuring data integrity, security, and accessibility. They are responsible for creating and modifying tables, queries, forms, and scripts to facilitate efficient data input and extraction. They also optimize database performance, implement backup and recovery procedures, and resolve complex database issues. They collaborate with other developers and stakeholders to understand their data requirements and translate them into database solutions. Their role also involves staying updated with the latest DBISAM features and technologies.