A Couchbase developer designs, develops, and manages applications using Couchbase, a NoSQL database technology. They are responsible for database architecture, creating design patterns and data models, and ensuring optimal performance and scalability. They also work on integrating Couchbase with other technologies, and migrating data from traditional databases. Additionally, they troubleshoot and resolve database issues, and ensure data security and integrity. They may also be involved in training team members in Couchbase technology. Their role requires a strong understanding of Couchbase, proficiency in programming languages, and knowledge of database design principles.