Mainframe z/OS System Programmer

A well-established enterprise technology organization is seeking a Mainframe z/OS Systems Programmer to join its infrastructure team in Phoenix, Arizona.This is a full-time hybrid position requiring three days onsite per week. The environment includes IBM z/OS, RACF, JES2/JES3, REXX, NetView, DB2, CICS, IMS, MQ, and enterprise automation platforms that support mission-critical business operations.

This opportunity is ideal for experienced mainframe professionals who enjoy solving complex infrastructure challenges, improving system reliability, and contributing to modernization initiatives. The organization is investing in automation, performance optimization, security enhancement, and long-term platform stability. Candidates will have the opportunity to work within a large-scale enterprise environment while maintaining strong technical ownership of mission-critical systems. Required Skills & Experience Experience administering IBM z/OS environments

Strong knowledge of JES2 and/or JES3

Experience with TSO/E, ISPF, and USS

RACF administration and security management experience

Knowledge of RMF, SMF, and SDSF performance monitoring tools

Experience performing z/OS upgrades and maintenance activities

Strong troubleshooting and root-cause analysis skills

Experience supporting enterprise change management processes

Automation experience using REXX, CLIST, NetView, or SA z/OS

Desired Skills & Experience Experience supporting DB2 environments

Experience supporting CICS, IMS, or MQ

Capacity planning and performance engineering background

ServiceNow experience

Disaster recovery planning and testing experience

Exposure to mainframe modernization programs

What You Will Be Doing Administer and maintain IBM z/OS operating systems

Implement system upgrades, patches, and maintenance activities

Monitor platform health and optimize performance

Support security, compliance, and access management initiatives

Create and maintain automation solutions

Troubleshoot and resolve production incidents

Participate in change implementation activities

Develop and maintain operational documentation

Tech Breakdown 40% IBM z/OS Administration

25% Performance & Capacity Management

20% Automation & Scripting

15% Security, Compliance & Change Management

Daily Responsibilities 75% Hands-on Technical Work

5% Mentorship & Knowledge Sharing

20% Team Collaboration