zOS Mainframe Systems Programmer

Salary: £55,000 - 95,000 per year

Requirements:

Multiple years of z/OS systems programming experience

Very strong Parallel Sysplex skills

Strong experience with z/OS, TSO/ISPF, USS, SDSF, JCL, and RACF

Experience installing several IBM and CA products

Deep mastery of z/OS architecture, including IPL procedures, JES2/JES3 configurations, Sysplex management, SMF data collection, and parmlib customization

Proficiency in writing and debugging system-level routines and automation in Assembler, REXX, and JCL

Experience managing hardware and logical resources across LPARs

Analytical troubleshooting skills for abends, storage hangs, and performance anomalies

Performance monitoring knowledge

Networking knowledge

Experience planning and leading hardware refreshes, feature activations, and migrations with minimal downtime

Ideally worked in a bank or an organisation with large installations

Confidence to work independently and start contributing from day one

Excellent problem-solving skills and the ability to be a true team player

Willingness to provide off-hours support when required

Responsibilities:

Upgrade, maintain, and support the z/OS operating system

Upgrade, maintain, and support ISV products, particularly from IBM and Computer Associates (CA)

Work closely with other engineering teams to ensure systems are stable, available, up to date, and running efficiently

Manage DASD and tape allocation across LPARs using HCD/HCM

Configure LPARs in HMC

Perform security administration using RACF or equivalent

Ensure data integrity and swift recovery using DFSMShsm policies and recall management, FDR/ABR backups, and FlashCopy or virtual tape replication

Optimize system throughput and response times using RMF and SMF report analysis, OMEGAMON or BMC MainView dashboards, and WLM classification and tuning

Configure and support mainframe connectivity including VTAM and SNA definitions, TCP/IP stack on z/OS, and OSA adapter and Coupling Facility communication

Execute OS and product upgrades using SMP/E and z/OSMF workflows

Use Broadcom, IBM, and BMC tooling for fix management and compliance reporting

Plan and lead hardware refreshes, feature activations, and migrations with minimal downtime, including IPL scheduling, vendor coordination, and change-control governance

Produce clear system diagrams, runbooks, and upgrade plansCollaborate with application teams, storage, networking, and security groups

Stay current on IBM Redbooks, z/OS release notes, firmware updates, and vendor training or industry conferences

Technologies:

AI

Cloud

Firmware

Hardware

IBM

Support

Security

Swift

TCP/IP

More:

We are NTT DATA, 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 worlds leading AI and digital infrastructure providers, with 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. We have experts in more than 50 countries and offer clients access to a robust ecosystem of innovation centers and established and start-up partners. This is a full-time hybrid role based remotely and on client site in Sheffield, with a comprehensive, locally competitive benefits package. We prioritize our peoples health and wellbeing, and we hire locally where possible to support timely and effective client service.

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