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NTT DATA Logo NTT DATA · IT - Administration

Zos Mainframe Systems Programmer

United Kingdom, Sheffield · Job Posted June 01, 2026
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Job Description

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).

Job Responsibility

  • 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

Requirements

  • 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
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