A CentOS developer is responsible for developing, testing, and maintaining applications on the CentOS platform, a free, open-source operating system based on the Linux kernel. They work on server installations, system configurations, and troubleshoot system issues. They also manage system updates and monitor performance to ensure optimal function. In addition, they may be involved in creating shell scripts for task automation and performing system backups. Furthermore, they work in collaboration with other developers and IT staff, ensuring seamless integration of new applications with existing systems, and often provide technical support and guidance to users and administrators.