Senior Mainframe Network Architect (z/OS) – On-Call

Dxc Technology España; Puentes Viejas; On-site; EUR 90,000 - 130,000; Full time

Job summary

DXC Technology España is seeking a senior Mainframe Network System Programmer to manage and secure z/OS network services, TCP/IP, and VTAM/SNA in a global, high-availability environment. You will lead migrations, upgrades, and disaster recovery efforts while mentoring others.

The role requires strong debugging skills, experience with security technologies, and a 24x7 on-call rotation to support international operations. English fluency is essential.

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 skills using REXX, CLIST, USS Shell, or similar tools.

Responsibilities

• 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, USS Shell to streamline operations

Skills

IBM z/OS

TCP/IP

VTAM/SNA

APPN/HPR

Enterprise Extender

TSO/ISPF

JCL

Disaster recovery

Production support

Automation scripting

Tools

REXX

CLIST

USS Shell

VIPA/DVIPA

Sysplex Distributor

Parallel Sysplex

Job description

DXC Technology España is seeking a senior Mainframe Network System Programmer to manage and secure z/OS network services, TCP/IP, and VTAM/SNA in a global, high-availability environment. You will lead migrations, upgrades, and disaster recovery efforts while mentoring others.

The role requires strong debugging skills, experience with security technologies, and a 24x7 on-call rotation to support international operations. English fluency is essential.