A Looker developer designs, builds, and maintains data models using Looker, a data exploration and business intelligence platform. They create customized data experiences by developing dashboards, reports, and visualizations for business users to facilitate data-driven decision-making. They work closely with data engineers and analysts to ensure data accuracy and availability. They also troubleshoot and resolve issues related to data integrity and usability. Their role involves understanding business requirements, translating them into LookML (Looker's modeling language), and optimizing performance for end users. They often play a key role in promoting data literacy across the organization.