A Columns developer designs, builds, and maintains software applications using a Columns-oriented database model. They create and manage data structures, write and optimize queries, and ensure data integrity and security. They liaise with other developers, data analysts, and stakeholders to understand and fulfill data requirements. They also troubleshoot and resolve any issues related to database performance and functionality. Additionally, they may be involved in database migration, testing, and documentation. Their work supports the efficient storage, retrieval, and manipulation of data, which is crucial for business intelligence, decision-making, and other operations.