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Position Summary We are seeking a talented Senior Mainframe Systems Programmer to support our exciting projects involving the z/OS operating system and related system software. In this key role, you will install, test, implement, and maintain z/OS systems, while also debugging and tuning system software to ensure optimal performance. This is not an Applications Programming position, so hands-on experience with z/OS components and supporting products like tape management, scheduling, and security is essential. Key Areas of Focus for this Role Participate in On-call Schedule. Incident / Problem resolution. Responsibilities and Tools Involved: Incident, change, and problem handling. Configuration and customization of the systems. Setup of system parameters. Communication with vendors for support and issue resolution. Contribute to technical projects and initiatives. Demonstrate a solid understanding of z/OS and its related software products. Perform PARMLIB configuration and JES2 customization. Support problem-solving and implementation of changes in z/OS environments. Utilize TSO/ISPF, SDSF, and JCL effectively. Exhibit strong written and verbal communication skills. Display analytical and problem-solving capabilities. Ideal Candidate Profile To succeed in this role, candidates must meet the following qualifications: Over 10 years of experience in a mainframe environment within a large enterprise, or a combination of education and relevant experience. A Bachelors degree or equivalent work experience. In-depth knowledge of z/OS installation and maintenance, including SMP/E. Proficient in TSO/ISPF, SDSF, JCL, and Unix System Services (USS). Familiarity with USS file system management and security. A team player with the ability to handle stress effectively during Major Incidents or emergencies. Excellent interpersonal, verbal, and written communication skills. Strong customer service orientation at a management level. Self-motivated with strong analytical and problem-solving skills. Proficient planning and organizational skills. A proactive approach and eagerness to learn. Other Desired Qualifications Ability to perform advanced Mainframe System Programmer tasks. Experience with moderately complex ISV installations. Knowledge of z/OS security and systems programming functions. Understanding of z/OS services structure, Parallel Sysplex, and Catalog management. Why Join Us? At Ensono, we strive to create a workplace where talent thrives. We support innovation, collaboration, and continuous learning while promoting diversity and inclusion. Enjoy the flexibility of working remotely or from our offices, as we value your work-life balance. Benefits Include: Unlimited Paid Days Off. Three health plan options through Blue Cross Blue Shield. 401k with company match. Eligibility for various insurance and flexible spending accounts. Paid Maternity, Paternity, and Sabbatical Leave. Education Reimbursement and Student Loan Assistance. Wellness programs and flexible work schedules. As of now, the estimated salary range for this role is between $80,000 and $148,000 annually, dependent on experience and other factors. In addition to salary, we offer an annual bonus plan and potential for equity grants. Ensono is committed to equal employment and building a diverse workforce. All qualified applicants will receive consideration, without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or protected veteran status. If you require accommodation during the application process, please inform your recruiter.