z/OS Mainframe Systems Programmer in London

At NTT DATA, we know that with the right people on board, anything is possible. The quality, integrity, and commitment of our employees are key factors in our company's growth, market presence and our ability to help our clients stay a step ahead of the competition. By hiring the best people and helping them grow both professionally and personally, we ensure a bright future for NTT DATA and for the people who work here.

NTT DATA is currently looking for a z/OS Mainframe Systems Programmer remote for our growing team in the UK and rest of Europe.

About the role

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
• MFS
• AS
• 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
• MFS
• AS

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.

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 centres 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 50 countries. We also offer clients access to a robust ecosystem of innovation centres as well as established and start-up partners. NTT DATA is a part of NTT Group, which invests over $3 billion each year in R&D.

Whenever possible, we hire locally to NTT DATA offices or client sites. This ensures we can provide timely and effective support tailored to each client's needs. While many positions offer remote or hybrid work options, these arrangements are subject to change based on client requirements. For employees near an NTT DATA office or client site, in-office attendance may be required for meetings or events, depending on business needs. At NTT DATA, we are committed to staying flexible and meeting the evolving needs of both our clients and employees.

NTT DATA recruiters will never ask for payment or banking information and will only use @nttdata.com, @nttdatafed.com and @talent.nttdataservices.com email addresses. If you are requested to provide payment or disclose banking information, please submit a contact us form.

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