Mainframe z/OS Network Engineer

NTT Limited; Madrid; On-site; EUR 65,000 - 90,000; Full time

Job summary

NTT DATA is seeking an experienced z/OS Systems Specialist to join our Madrid mainframe team. You will support the z/OS host communications subsystems and related products in a large-scale environment, ensuring security and data integrity across TCP/IP, VTAM, and IPsec policies.

You will work in a multi-functional team, participate in 24x7 coverage, and coordinate changes via ITIL-aligned processes. Strong problem solving and collaboration with operations and applications will be essential.

Qualifications

• Experience in administering file transmissions products such as Connect:Direct and FTP, or as a user of these products.
• 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).
• Experience of problem management from initial diagnosis through to resolution.
• Understanding of the Change Management process.

Responsibilities

• Being part of a multi-functional team, supporting IBM mainframe networks and transmissions products and infrastructure.
• Participation in support rota providing 24x7 cover.
• Perform TCPIP Port Reserves (Additions, Deletions, Changes)
• Perform VTAM updates (Additions, Deletions, Changes)
• Manage OSA Adapters in a complex mainframe environment
• Perform VTAM PU/LU updates (Additions, Deletions, Changes) including Enterprise Extenders (EE)
• Implement AT-TLS rules (digital certificate management).
• Configure and manage IPSEC policies (permit/deny rules, VPN- ipsec tunnels)
• Trace, Debug and Error Analysis
• Communicate regularly with technical, applications and operational staff to ensure Network connectivity and security (may involve some after hours and weekend work)

Skills

z/OS systems programming

Mainframe networking

Connect Direct FTP

IPsec TLS certificates

Problem management

Change management

Network security

VTAM updates

NetMaster

TUBES

Supersession

SNA TCPIP

Tools

Connect Direct

FTP client

NetMaster

TUBES

Supersession

Job description

NTT DATA is seeking an experienced z/OS Systems Specialist to join our Madrid mainframe team. You will support the z/OS host communications subsystems and related products in a large-scale environment, ensuring security and data integrity across TCP/IP, VTAM, and IPsec policies.

You will work in a multi-functional team, participate in 24x7 coverage, and coordinate changes via ITIL-aligned processes. Strong problem solving and collaboration with operations and applications will be essential.