A Kibana developer designs and implements user interfaces for Kibana, a data visualization and exploration tool used for log and time-series analytics. They utilize technologies like JavaScript, HTML, and CSS to create interactive visualizations and dashboards to present data from Elasticsearch. They work on improving Kibana's performance, adding new features, and fixing bugs. They also collaborate with other teams to understand user requirements and ensure the tool meets these needs. Additionally, they may write tests to ensure the reliability and stability of the software. They often work in an Agile environment, continuously improving the software based on user feedback.