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Citi Logo Citi · IT - Administration

Global Head of Mainframe and Host System Service

United States, Irving 250000.00 - 500000.00 USD / Year · Job Posted May 28, 2026
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Job Description

The Global Head of Mainframe and Host System Service provides strategic leadership for enterprise-wide mainframe infrastructure (z/OS, z/TPF, z/VM, LinuxOne, Unisys, Tandem, I-Series and Stratus Technologies), storage systems (DS8K, VMAX, TS7700 and FS9K), and middleware (CICS, Websphere, MQ, DB2) and Network Software. This role leads infrastructure strategy, modernization, performance, high availability, budget, and vendor management, ensuring resilient, secure 24/7 operations.

Job Responsibility

  • Develop and execute a multi-year technology roadmap for mainframe hardware (IBM Z) and software (z/OS, z/TPF, z/VM, LinuxOne) to support digital transformation and high-volume transaction processing
  • Oversee the performance, availability, and capacity planning of z/17 processors and Coupling Facilities, critical storage (DS8K, FlashCopy technologies, FS9K, and TS7700 virtual tape)
  • Manage large data base estate of mission critical database predominantly DB2
  • Ensure high availability and optimization of middleware, including CICS transaction servers, Websphere and MQ Series messaging
  • Lead 24/7 global operations, implementing automation (z/OSMF, System Automation), disaster recovery (BCP), and system security compliance
  • Drive modernization initiatives, manage the mainframe technology budget, manage vendor relationships (IBM, Broadcom etc), and lead technical teams
  • Work closely with BISO’s and Internal Audit to insure all aspects of Security and Vulnerability management are rigorously managed and reported on

Requirements

  • 10+ years in mainframe systems management, with at least 5+ years in a senior leadership role over large-scale, complex z/OS environments
  • Deep technical knowledge of z/17 Processors, z Operating systems, Hardware Configuration Management, z/OS, z/VM, LinuxOne, and IBM and Dell storage technologies (DS8K, VMAX TS7700)
  • Extensive experience with IBM DB2, CICS, and MQ
  • Proven ability to manage global teams, vendor relationships, and budgetary responsibilities

Nice to have

  • Experience in banking, finance, or high-volume transaction industries
  • Experience in hybrid cloud initiatives linking mainframe to public cloud

What we offer

  • medical, dental & vision coverage
  • 401(k)
  • life, accident, and disability insurance
  • wellness programs
  • paid time off packages, including planned time off (vacation), unplanned time off (sick leave), and paid holidays
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