To thrive as a Mainframe Capacity Planner, you need in-depth knowledge of mainframe systems, performance analysis, and capacity management, often supported by a degree in computer science, IT, or a related field. Familiarity with tools such as IBM RMF, CA MICS, or BMC MainView, as well as certifications like ITIL or vendor-specific credentials, are highly valuable. Strong analytical thinking, problem-solving skills, and effective communication are essential soft skills for this role. These competencies are crucial to accurately forecast resource needs, optimize system performance, and collaborate effectively across IT teams.