An mdadm/RAID developer works on managing and maintaining RAID disk arrays in Linux environments. They utilize mdadm, a Linux utility used to manage and monitor software RAID devices. Their responsibilities include creating, managing, and troubleshooting RAID arrays, ensuring data redundancy, improving system performance, and maintaining data integrity. They also develop and implement RAID algorithms, work on error detection and correction, and perform disk recovery. They must understand various RAID levels (, , , , etc.) and their applications. Additionally, they contribute to the development, testing, and enhancement of mdadm software and other RAID technologies.