A Continuous Integration (CI) developer is responsible for integrating changes from multiple contributors into a project. They manage and troubleshoot the CI pipeline, ensuring smooth, frequent updates to the code base. Their tasks include writing scripts, setting up automated tests, managing code merges, and identifying and fixing bugs promptly. They work closely with other developers, quality assurance teams, and operations to maintain code quality and stability. Their goal is to minimize integration problems, improve code quality, and speed up software delivery. They must understand version control systems, build tools, and CI technologies like Jenkins or Travis CI.