Job Name: Mainframe System Programmer - Company: Atos Location: Mexico – Remote Lunes – Viernes On Call availability 24/7 for emergencies Job Type: Full-time Role Overview: The Mainframe System Programmer is responsible for the installation, maintenance, problem diagnosis, and administration of the z/OS Mainframe operating system. This role ensures system stability, performance, and compliance with Atos security standards while supporting continuous service improvement. The position requires close collaboration with internal teams and includes participation in an on-call rotation. Key Responsibilities: Install, upgrade, and administer the z/OS operating system, including RSU maintenance Perform system changes in accordance with company regulations, security standards, and internal controls Provide IPL support and resolve JES2/JES3 issues Maintain TSO/ISPF environments, including CLIST, REXX, and PROC maintenance Perform MVS tuning and manage PARMLIB Create and manage LPARs Execute SM...