IBMz Network Engineer

Overview

In this role you will maintain and secure a large-scale z/OS mainframe network platform. You will join a multi-functional team focused on IBM mainframe networking, ensuring reliable connectivity and data/IP security for host subsystems and product suites. You’ll handle critical configuration, issue resolution, and 24x7 support to keep transmission services running.

This is an opportunity to work at scale with established mainframe tooling while contributing to responsible innovation. You will collaborate across technical, application, and operations teams to drive stable, secure mainframe environments.

• Configure and maintain the integrity and data/IP security of the Mainframe host communication subsystems and associated products
• Support IBM mainframe networks and transmission products and infrastructure as part of a multi-functional team
• Participate in 24x7 on-call support rota
• Perform TCPIP Port Reserves (Additions, Deletions, Changes)
• Perform VTAM updates (Additions, Deletions, Changes) and PU/LU updates including Enterprise Extenders
• Manage OSA Adapters in a complex mainframe environment
• Implement AT-TLS rules (digital certificate management)
• Configure and manage IPSEC policies (permit/deny rules, VPN/IPsec tunnels)
• Trace, debug and perform error analysis
• Communicate with technical, applications and operational staff to ensure network connectivity and security (including after hours)

• Experience administering file transmission products such as Connect:Direct and FTP (or as a user)
• Knowledge of z/OS and z/OS utilities
• Understanding of z/OS networking services, structure and related software and protocols
• Understanding of network security disciplines (IPSec, TLS/SSL, certificates) and their relation to file transmission
• Experience with problem management from diagnosis to resolution
• Understanding of Change Management processes
• Ability to customize/manage secure SNA and TCP/IP networks under z/OS
• Knowledge of mainframe network management tools (NetMaster) and multi-session products (TUBES, Supersession)
• Experience managing mainframe printing products
• General z/OS systems programming experience
• Knowledge of System z hardware including OSA-Express network cards
• Excellent problem-solving and analytical skills
• Good communication, teamwork and negotiation skills
• Familiarity with Cisco Network Solutions
• Ability to work to tight deadlines under pressure
• Good organizational skills
• Flexibility and adaptability
• Ability to build strong relationships with colleagues and customers
• Business awareness and understanding of IT business requirements
• Willingness to stay updated with new technology
• Understanding of Data Protection Act
• Experience as a z/OS Systems Specialist in IT

• Good communication
• Teamwork
• Negotiation
• z/OS and z/OS utilities
• TCP/IP networking
• VTAM and Enterprise Extenders