Mainframe Network Lead

Job Description:

Mainframe Network System Programmer About DXC DXC helps global companies run their mission-critical systems and operations while modernizing IT, optimizing data architectures and ensuring security and scalability across public, private and hybrid clouds. The world’s largest companies and public sector organizations trust DXC to deploy services to drive new levels of performance, competitiveness, and customer experience across their IT estates.

Our more than 125,000 people in 70-plus countries are entrusted by our customers to deliver transformative technologies to ensure the success, safety and well-being of businesses and people around the world. By combining strengths and expertise globally, we create solutions and deliver greater outcomes for customers across their entire IT estate. Learn more about how we deliver excellence for our customers and colleagues at DXC.com.

About the Team / Offering – Global Infrastructure Services – Infrastructure Services DXC Global Infrastructure Services (GIS) manages and modernizes IT infrastructure for the world’s largest enterprises through agentic, platform-led operations. We deliver cloud, security, workplace, infrastructure and business-process services that shift operations from reactive support to proactive, outcome-driven service delivery at scale, with human-in-the-loop governance.

DXC Infrastructure Services deliver agentic operations through DXC OASIS to manage large-scale, mission-critical environments. Autonomous, policy-governed agents anticipate issues, optimize performance, and support remediation with human-in-the-loop control, shifting operations from reactive support to pre-emptive, resilient service delivery.

About the Role The Mainframe Network System Programmer is a senior professional responsible for the administration, security, availability, and performance of network infrastructure within IBM z/OS environments. This role is critical to ensuring the connectivity and continuity of business-critical services, managing key technologies such as TCP/IP, VTAM/SNA, Communications Server, and high-availability solutions.

In this position, the successful candidate will install, configure, and maintain z/OS network software and services, optimize TCP/IP and VTAM/SNA environments, and ensure the security and resilience of enterprise-scale, mission-critical infrastructure. The role requires strong troubleshooting skills to resolve complex connectivity and performance issues, as well as active participation in migrations, infrastructure upgrades, and disaster recovery activities.

The ideal candidate is a highly specialized IBM Z/Mainframe networking expert with deep technical expertise combined with leadership, problem-solving, and stakeholder management skills. This individual will collaborate with cross-functional technical teams and vendors, provide technical leadership and mentoring, and participate in a 24x7 on-call rotation to support global operations. Fluency in English is essential for effective collaboration within international teams and global projects.

Essential Job Functions

Install, configure, upgrade, and maintain z/OS network software and services

Manage and optimize TCP/IP and VTAM/SNA environments for performance and reliability

Ensure network security, resilience, and operational stability across mainframe environments

Troubleshoot complex connectivity and performance issues using z/OS diagnostics and monitoring tools

Support migrations, infrastructure upgrades, and disaster recovery activities

Collaborate with cross-functional technical teams and vendors on network infrastructure initiatives

Provide technical leadership and mentoring to junior team members

Participate in a 24x7 on-call rotation to support business-critical services

Implement and manage network security technologies including AT-TLS, TLS certificates, IPsec, and secure file transfer protocols

Develop and maintain automation scripts using REXX, CLIST, or USS Shell to streamline operations

Basic Qualifications

8+ years of experience in Mainframe Network Systems Programming or Administration

Fluent English (written and spoken) is mandatory

Strong expertise in IBM z/OS Communications Server, TCP/IP, VTAM/SNA, APPN/HPR, and Enterprise Extender

Experience with network security technologies including AT-TLS, TLS certificates, IPsec, IP filtering, SSH, and secure file transfer protocols

Knowledge of VIPA/DVIPA, Sysplex Distributor, Parallel Sysplex networking, and high-availability environments

Hands-on experience with z/OS commands, TSO/ISPF, JCL, network diagnostics, monitoring, and performance tuning

Experience with disaster recovery, incident management, change management, and production support

Automation and scripting s