Mainframe Systems Engineer Jobs in Wisconsin (NOW HIRING)

About the Job

This is a mainframe role focused on IBM z/OS environments.

While the role exists within the broader Software Engineering family, daytoday responsibilities are exclusively centered on z/OS platform engineering and operations. Experience with distributed systems or cloud technologies is not required for success in this position.

What You'll Do

• Mentor, enable, and teach peers to be selfsufficient within the mainframe platform
• Apply engineering standard methodologies to analyze, design, and maintain z/OS systemlevel solutions
• Leverage established standards, best practices, and automation to support missioncritical mainframe workloads
• Identify complex systemlevel problems and implement reliable, supportable solutions in a highly regulated production environment
• Review, verify, and validate systemlevel changes, configurations, and automation introduced into production
• Drive continuous improvement across reliability, availability, performance, security, and operational efficiency
• Develop, maintain, and execute disaster recovery and redundancy strategies
• Partners with vendors and enterprise teams on emerging best practices, patterns, and technologies
• Proactively learn emerging platforms and related technologies
• Establish and maintain best practices related to compliance, security, privacy, and legal requirements
• Anticipate deviations from standard practices and determine practical paths forward
• Track industry trends relevant to the domain and apply them where appropriate
• Break down complex problems into manageable components and help others do the same

Mainframe / z/OS-Focused Responsibilities

• Perform handson z/OS system administration including IPLs, system startup/shutdown, parameter tuning, and system recovery
• Plan, execute, and validate IBM and ISV software installs and upgrades using z/OSMF Software Instances and Workflows
• Manage SMP/E environments including PTFs, HOLDDATA, USERMODs, and consolidation builds
• Install, analyze, and modify system exits and USERMODs, including assembler updates when required
• Build and maintain systemresident DASD volumes, system libraries, and reproducible system builds
• Configure and administer JES2
• Administer RACF security including users, groups, profiles, access controls, and policy enforcement
• Author, debug, and optimize JCL for batch processing
• Analyze SMF/RMF data for accounting, capacity planning, and system performance tuning
• Administer and tune DFSMS components including DFSMShsm and DFSMSrmm
• Configure and troubleshoot TCP/IP for z/OS and associated services
• Develop automation and tools using REXX, CLIST, and UNIX System Services scripting
• Use monitoring tools such as BMC MainView and/or Intellimagic Vision
• Support mainframe hardware environments including HMC operations, CPC/LPAR configuration, and IBM zSeries platforms
• Participate in oncall rotations and ITILaligned incident, change, and problem management
• Coordinate with vendors and ISVs for licensing, problem determination, and PTF coordination
• Create and maintain documentation, runbooks, SOPs, and operational procedures
• Mentor and train junior staff on z/OS engineering and operational practices

What You'll Bring to the Role

Note: This position requires deep experience in IBM z/OS systems programming. Candidates whose background is primarily AWS, Linux, Windows, or distributed/cloud platforms without substantial mainframe experience are unlikely to be a fit.

• Bachelor's degree or equivalent experience
• At least 4 years of relevant experience
• 5+ years of professional IT experience, primarily focused on enterprise mainframe platforms
• Experience applying DevOps concepts, Agile methodologies, and automation in mainframe environments
• Experience monitoring and tuning performance of largescale systems
• Working knowledge of scripting or programming concepts for automation
• Familiarity with authentication, authorization, certificates, and vulnerability management

Required z/OS / Mainframe Experience

• Extensive handson experience as a z/OS Systems Programmer in production environments
• Strong knowledge of z/OS internals, JES2, RACF, SMP/E, and system libraries
• Proven expertise in SMF/RMFbased performance tuning, capacity planning, and problem determination
• Experience with DASD, tape management, and SAN technologies, including Hyperswap
• Proficiency with REXX, CLIST, and USS shell scripting (additional languages a plus)
• Experience supporting Sysplex and Coupling Facility environments (preferred)
• Exposure to subsystems such as CICS, DB2, and MQ and their integration with z/OS
• Knowledge of PKI/SSL, LDAP integration, Kerberos, and mainframe security hardening
• Experience with z/OSMF, Ansible, or automation/orchestration tooling for mainframe lifecycle management
• Familiarity with cloudtomainframe integration or CI/CD concepts as applied to z/OS
• Strong troubleshooting, documentation, and communication skills under sustained production pressure

Skills You Have

The hiring team will assess candidates against the following skills:

• Communicates complex technical information clearly across both technical and nontechnical audiences.
• Designs and supports systems with a strong customerfirst mindset, particularly for missioncritical platforms.
• Designs, implements, and maintains enterpriseclass hardware, system software, networks, and data storage platforms.
• Uses monitoring and performance tools to diagnose, optimize, and stabilize system performance.
• Demonstrates deep expertise in operating system architecture, internals, and resource management.
• Develops, maintains, and documents complex programs, scripts, and automation.
• Resolves complex technical issues and drives alignment on durable solutions in production environments.

#LI-Remote #LI-Hybrid

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We believe in fairness and transparency. It's why we share the salary range for most of our roles. However, final salaries are based on a number of factors, including the skills and experience of the candidate; the current market; location of the candidate; and other factors uncovered in the hiring process. The standard pay structure is listed but if you're living in California, New York City or other eligible location, geographic specific pay structures, compensation and benefits could be applicable, click here to learn more.

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Northwestern Mutual is an equal opportunity employer that welcomes talented individuals of all backgrounds. We are committed to creating and maintaining an environment in which each employee can contribute creative ideas, seek challenges, assume leadership and continue to focus on meeting and exceeding business and personal objectives.