Your Complete Guide to Finding a Mainframe Job in 2025
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Employers hiring for people with expertise in z/OS also frequently require knowledge of Mainframe, DB2, COBOL, and IBM Z. This is based on data from over 262 z/OS listings.
Based on 103 job openings, the average salary for z/OS professionals is $119,387. Specific salaries vary depending on experience and role.
z/OS is IBM’s flagship mainframe operating system, evolving from earlier systems such as OS/390. It was designed to manage large-scale workloads with high availability, workload management, and advanced security.
z/OS remains central to enterprise mainframe environments, supporting COBOL, PL/I, Java, and modern DevOps tooling. It is widely used in financial services, government, healthcare, and large-scale transaction processing environments where uptime and data integrity are critical.
The demand for z/OS professionals remains steady. Companies like Kyndryl, ensono, JPMorganChase, and Rocket Software together with 114 more are actively hiring in the space.
z/OS expertise is in demand globally. These are the 5 countries with the most z/OS job listings.
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