In this role you will support a large-scale z/OS mainframe network, focusing on secure host communication subsystems. You'll join a multi-functional team providing 24x7 coverage and work on configuring, maintaining, and securing mainframe network services. You will interact with technical, applications, and operations teams to ensure connectivity and security, with opportunities to handle complex problems and stay current with evolving technologies. This position offers a meaningful chance to contribute to enterprise-scale mainframe operations within a globally diverse organization. Support IBM mainframe networks and transmissions infrastructure
Participate in 24x7 support rota
Perform TCPIP Port Reserves (Add/Delete/Change)
Perform VTAM updates (Add/Delete/Change)
Manage OSA Adapters in a complex mainframe environment
Perform VTAM PU/LU updates including Enterprise Extenders
Implement AT-TLS rules and manage digital certificates
Configure and manage IPSEC policies (permit/deny, VPN/IPsec tunnels)
Trace, debug and perform error analysisCoordinate with technical,



applications and operations staff to ensure network connectivity and security, including after hours and weekends as needed
Experience administering file transmission products such as Connect: Direct and FTP (or equivalent user experience)
Knowledge of z/OS and z/OS utilities
Understanding of z/OS networking services and related software/protocols
Understanding of network security disciplines (IPSec, TLS/SSL, certificates)
Experience in problem management from diagnosis to resolution
Understanding of Change Management processes
Ability to customize and manage secure SNA and TCP/IP networks under z/OS
Knowledge of mainframe network management tools (e.g., NetMaster) and multi-session tools (TUBES, Supersession)
Experience with mainframe printing products
Knowledge of System z hardware including OSA-Express NICs
Excellent problem-solving and analytical skills
Strong communication, teamwork and negotiation skil

📌 Network/Datacenter Engineer (Barcelona)
🏢 Ntt Data
📍 Barcelona