zOS Mainframe Systems Programmer

NTT America, Inc.; Sheffield; On-site; GBP 70,000 - 90,000; Full time

Job summary

NTT DATA in the UK is seeking an experienced z/OS Mainframe Systems Programmer to join a growing team in the UK. The role is hybrid: remote plus Sheffield site, offering exposure to one of the world’s largest z/OS environments.

You will upgrade and support the z/OS OS and ISV products from IBM and CA, work closely with other engineering teams, and manage LPAR resources, DASD/tape, and network connectivity. Strong automation skills and proven problem-solving capabilities are essential.

Qualifications

• Multiple years of z/OS systems programming experience.
• Strong Parallel Sysplex skills and z/OS architecture knowledge.
• Experience with RACF, JCL and OS/390-style tooling.
• Familiarity with IBM/CA product installation and system upgrades.

Responsibilities

• Upgrade, maintain and support the z/OS operating system and ISV products.
• Collaborate with engineering teams to keep systems stable and up-to-date.
• Manage hardware and resources across LPARs; DASD and tape allocation.
• Configure and support mainframe connectivity (VTAM, TCP/IP).
• Perform OS/product upgrades using SMP/E and z/OSMF workflows.

Skills

z/OS

Parallel Sysplex

TSO/ISPF

JCL

RACF

System-level automation

Tools

JES2/JES3

DFSMShsm

RMF/SMF

z/OSMF

Job description

Competitive salary | UK: Hybrid: remote + Sheffield

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 (hybrid: remote + Sheffield) for our growing team in the UK.

Overview

NTT DATA are seeking an experienced z/OS Mainframe Systems Programmer to work on major projects, in one of the largest z/OS Mainframe environments globally. The role involves upgrading and supporting the z/OS operating system and ISV products, mainly from IBM and Computer Associates (CA).

Responsibilities

• Upgrading, maintaining and supporting the z/OS operating system
• Upgrading, maintaining and supporting ISV products particularly from vendors: IBM and Computer Associates (CA)
• Working closely with the other Engineering teams to ensure the systems that are built are stable, available, up to date and running as effectively and efficiently as possible
• Managing hardware and logical resources across LPARs:
• DASD and tape allocation via HCD/HCM
• LPAR configuration in HMC
• Security administration using RACF or equivalent
• Ensuring data integrity and swift recovery with:
• DFSMShsm policies and recall management
• FDR/ABR for high-speed backups
• FlashCopy or virtual tape replication for near-instant restores
• Optimizing system throughput and response times utilizing:
• RMF and SMF report analysis
• OMEGAMON or BMC MainView dashboards
• WLM classification and tuning
• Configuring and supporting mainframe connectivity:
• VTAM and SNA definitions
• TCP/IP stack on z/OS
• OSA adapter and Coupling Facility communication
• Executing OS and product upgrades with industry-standard utilities:
• SMP/E for PTF, APAR, and deliverable management
• z/OSMF workflows for streamlined maintenance
• Broadcom (e.g., Topaz), IBM, and BMC tooling for fix management and compliance reporting

Skills

• Multiple years of z/OS systems programming experience
• Should have very strong Parallel Sysplex skills
• z/OS, TSO/ISPF, USS, SDSF, JCL, RACF
• Installation of several different IBM and CA products
• Extensive experience of installing many IBM and CA products
• Deep mastery of z/OS architecture, including IPL procedures, JES2/JES3 configurations, Sysplex management, SMF data collection, and parmlib customization.
• Proficient in writing and debugging system-level routines and automation:
• Assembler for exits and control blocks
• REXX for scripting and batch utilities
• JCL for job submission, parameterization, and workflow control
• Managing hardware and logical resources across LPARs:
• DASD and tape allocation via HCD/HCM
• LPAR configuration in HMC
• Security administration using RACF or equivalent
• Analytical troubleshooting of abends, storage hangs, and performance anomalies using:
• Dump analysis with IPCS
• SLIP and trace tools
• System logs and console messages
• Ensuring data integrity and swift recovery with:
• DFSMShsm policies and recall management
• FDR/ABR for high-speed backups
• FlashCopy or virtual tape replication for near-instant restores
• Performance Monitoring
• Networking Knowledge
• Executing OS and product upgrades with industry-standard utilities:
• SMP/E for PTF, APAR, and deliverable management
• z/OSMF workflows for streamlined maintenance
• Broadcom (e.g., Topaz), IBM, and BMC tooling for fix management and compliance reporting
• Project Management & Hardware Refresh
• Planning and leading hardware refreshes, feature activations, and migrations with minimal downtime, including IPL scheduling, vendor coordination, and change-control governance.
• Producing clear system diagrams, runbooks, and upgrade plans, while collaborating with application teams, storage, networking, and security groups.
• Documentation and Communication
• Should have ideally worked in a Bank or organisations with large installations
• Should be confident, able to work independently and start contributing from day one
• Must have excellent problem-solving skills and be a true team player
• Will need to provide off hours support for the implementation of software changes, when required
• Staying current on IBM Redbooks, z/OS release notes, firmware updates, and attending vendor training (IBM, Broadcom, BMC) or industry conferences.

Work setup

Hybrid working: remote + on client site (Sheffield)

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 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 50 countries. We also offer clients access to a robust ecosystem of innovation centers 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.

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