An ALM Quality Center tool developer primarily designs, develops, and maintains software applications using HP's Application Lifecycle Management (ALM) tool. They work on the Quality Center platform to manage application testing, track defects, and handle requirements. Their role includes creating test plans, designing test cases, executing tests, and documenting the results to ensure software quality. They also collaborate with software developers and project managers to identify any issues or improvements. Additionally, they may be responsible for providing training and support to other team members on the use of the Quality Center tool.