Mainframe z/OS Systems Programmer

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

While the role exists within the broader Software Engineering family, day-to-day 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 self-sufficient within the mainframe platform
• Apply engineering standard methodologies to analyze, design, and maintain z/OS system-level solutions
• Leverage established standards, best practices, and automation to support mission-critical mainframe workloads
• Identify complex system-level problems and implement reliable, supportable solutions in a highly regulated production environment
• Review, verify, and validate system-level 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 hands-on 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 system-resident 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 on-call rotations and ITIL-aligned 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, The hiring team will assess candidates against the following skills:
• Communicates complex technical information clearly across both technical and non-technical audiences.
• Designs and supports systems with a strong customer-first mindset, particularly for mission-critical platforms.
• Designs, implements, and maintains enterprise-class 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.

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 large-scale systems
• Working knowledge of scripting or programming concepts for automation
• Familiarity with authentication, authorization, certificates, and vulnerability management

Required z/OS / Mainframe Experience

• Extensive hands-on 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/RMF-based 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 cloud-to-mainframe integration or CI/CD concepts as applied to z/OS
• Strong troubleshooting, documentation, and communication skills under sustained production pressure