z/OS Mainframe Systems Programmer

NTT DATA, Inc.; Dublin; On-site; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Benefits package

Job summary

NTT DATA is seeking an experienced z/OS Mainframe Systems Programmer to join our enterprise infrastructure team in Ireland. The role focuses on installation, upgrade, maintenance, and support of the IBM z/OS operating system and related IBM/CA software across large, mission-critical environments.

The ideal candidate will have deep z/OS expertise, Parallel Sysplex administration skills, and a track record of delivering stable, highly available mainframe services in complex banking or financial

Qualifications

• 10+ years of hands-on experience in z/OS Systems Programming.
• Deep knowledge of: z/OS Operating System, SMP/E, TSO/ISPF, USS, SDSF, JCL, RACF.
• Strong expertise in Parallel Sysplex implementation and support and its architecture.
• Extensive experience installing, configuring, supporting and maintaining IBM and CA/Broadcom mainframe products.
• Experience in large enterprise environments, preferably Banking/Financial Services.

Responsibilities

• Install, configure, customize, upgrade, and maintain IBM z/OS operating systems.
• Manage and support IBM and CA/Broadcom system software across enterprise environments.
• Plan and execute OS upgrades and software maintenance using SMP/E.

Skills

z/OS

SMP/E

TSO/ISPF

USS

SDSF

JCL

RACF

Parallel Sysplex

Tools

IBM & CA/Broadcom mainframe products

Job description

Make an impact with NTT DATA

Join a company that is pushing the boundaries of what is possible. We are renowned for our technical excellence and leading innovations, and for making a difference to our clients and society. Our workplace embraces diversity and inclusion – it’s a place where you can grow, belong and thrive.

Make an impact with NTT DATA

Join a company that is pushing the boundaries of what is possible. We are renowned for our technical excellence and leading innovations, and for making a difference to our clients and society. Our workplace embraces diversity and inclusion – it’s a place where you can grow, belong and thrive.

Your day at NTT DATA

We are seeking an experienced z/OS Mainframe Systems Programmer to join our enterprise infrastructure team. This role is responsible for the installation, upgrade, maintenance, and support of the IBM z/OS operating system and a broad range of ISV products, primarily from IBM and Computer Associates (CA/Broadcom).

The ideal candidate will possess deep technical expertise in z/OS Systems Programming, strong Parallel Sysplex administration skills, and extensive experience working within large-scale, mission-critical environments such as banking and financial services organizations. The successful candidate will be a self-starter who can work independently, troubleshoot complex technical issues, and contribute effectively from day one.

This position requires excellent communication skills, strong analytical thinking, collaboration with cross-functional teams, and participation in planned after-hours activities related to system upgrades, maintenance, and implementations.

In this role, You will

• Install, configure, customize, upgrade, and maintain IBM z/OS operating systems.
• Manage and support IBM and CA/Broadcom system software products across enterprise environments.
• Plan and execute operating system upgrades and software maintenance activities using SMP/E.
• Administer and support large-scale Parallel Sysplex environments to ensure high availability and performance.
• Perform system performance monitoring, capacity planning, and resource optimization.
• Analyse and resolve complex system-level issues involving z/OS, middleware, and infrastructure components.
• Work closely with application support, infrastructure, security, and operations teams to ensure platform stability.
• Implement software maintenance, fixes, service packs, and vendor-recommended updates.
• Support disaster recovery, business continuity, and high-availability initiatives.
• Maintain system security controls and ensure compliance with organizational standards.
• Create and maintain technical documentation, procedures, and operational runbooks.
• Participate in root cause analysis and problem management activities.
• Provide technical guidance and mentoring to junior team members.
• Support production implementations and planned maintenance activities, including off-hours and weekend work when required.

Required Qualifications

• 10+ years of hands‑on experience in z/OS Systems Programming.
• Deep knowledge of:
  • z/OS Operating System
  • SMP/E
  • TSO/ISPF
  • UNIX System Services (USS)
  • SDSF
  • JCL
  • RACF
• Strong expertise in Parallel Sysplex implementation and support as well as Parallel Sysplex architecture and administration
• Extensive experience installing, configuring, customizing, supporting and maintaining multiple IBM and CA/Broadcom mainframe products.
• Experience working in large enterprise environments, preferably within Banking or Financial Services.
• Strong troubleshooting and problem-solving capabilities.
• Ability to independently manage complex technical assignments.
• Excellent verbal and written communication skills.
• Experience supporting mission-critical production environments with stringent SLA requirements.

Desired Qualifications

• Experience with ACF2 Security Administration.
• Knowledge of GDPS (Geographically Dispersed Parallel Sysplex) environments.
• Working knowledge of:
  • Assembler
  • REXX
  • OMEGAMON
  • RMF
  • SMF
  • SAS
• Experience with automation and operational tooling in mainframe environments.
• Understanding of disaster recovery and high‑availability architectures.
• Exposure to hybrid infrastructure environments and modernization initiatives.
• Industry certifications related to IBM Z Platforms or Mainframe Systems Programming are desirable.

Job Expectations

• Deliver stable, secure, and highly available mainframe infrastructure services.
• Participate in change management, release management, and implementation activities.
• Provide on‑call and after‑hours support for critical production changes and incident resolution.
• Ensure adherence to enterprise security, compliance, and operational standards.
• Collaborate with global teams and stakeholders across infrastructure, applications, and business units.
• Drive continuous improvement initiatives focused on system reliability, performance, and automation.
• Maintain thorough documentation of system configurations, procedures, and technical implementations.
• Demonstrate ownership, accountability, and a proactive approach to issue resolution.
• Act as a trusted technical expert for z/OS platform services and system software products.

Primary Skillset

• z/OS
• SMP/E
• TSO/ISPF
• USS (UNIX System Services)
• SDSF
• JCL
• RACF
• Parallel Sysplex
• Installation, customization, and support of IBM and CA/Broadcom products

Secondary Skillset

• ACF2
• GDPS
• RACF Administration
• Assembler
• REXX
• OMEGAMON
• RMF
• SMF
• SAS

Benefits

Our people are the most critical component of our long‑term success and their health and wellbeing are our priority. You will enjoy a comprehensive, locally competitive benefits package.

Workplace type:

About NTT DATA

NTT DATA is a $30+ billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world’s leading AI and digital infrastructure providers, with unmatched capabilities in enterprise‑scale AI, cloud, security, connectivity, data centers and application services. Our consulting and industry solutions help organizations and society move confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more than 70 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start‑up partners. NTT DATA is part of NTT Group, which invests over $3 billion each year in R&D.

Equal Opportunity Employer

NTT DATA is proud to be an Equal Opportunity Employer with a global culture that embraces diversity. We are committed to providing an environment free of unfair discrimination and harassment. We do not discriminate based on age, race, colour, gender, sexual orientation, religion, nationality, disability, pregnancy, marital status, veteran status, or any other protected category. Join our growing global team and accelerate your career with us. Apply today.

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