Mainframe Network Engineer – z/OS & Secure Connectivity

NTT DATA, Inc.; Dublin; On-site; EUR 65,000 - 90,000; Full time

Job summary

NTT DATA is seeking a skilled z/OS Systems Specialist to join a large-scale IBM mainframe environment. You will support the z/OS networking and host subsystems, ensuring data/IP security and system integrity.

You’ll work within a multi-functional team, participate in 24x7 support rotas, and manage VTAM, OSA adapters and IPsec/TLS configurations. Strong problem-solving and collaboration skills are essential.

Qualifications

• Experience 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) and how they relate to file transmission.
• Experience of problem management from initial diagnosis through to resolution.
• Understanding of the Change Management process.
• 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 manager products such as TUBES and Supersession.
• Experience of managing mainframe printing products.
• General z/OS systems programming experience.
• Knowledge of System z hardware including the OSA-Express network cards.
• Excellent problem-solving and analytical skills.
• Good communication, teamwork and negotiation skills.
• Familiarity with the Cisco Network Solutions.
• The ability to work to tight deadlines under pressure.
• Good organisational skills.
• Flexibility and adaptability.
• The ability to create and maintain strong working relationships with colleagues and customers.
• Business awareness and understanding of business requirements of IT.
• A willingness to keep up to date with developments in new technology.
• An understanding of information legislation, such as the Data Protection Act.
• Experience of working as a z/OS Systems Specialist in the IT industry.

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

Mainframe network

TCP/IP

VTAM

IPsec

NetMaster

TUBES

Supersession

Connect:Direct

FTP

TLS/SSL

Cisco networking

data protection act

problem management

change management

SNA/TCP-IP

Tools

OS utilities

z/OS utilities

Job description

NTT DATA is seeking a skilled z/OS Systems Specialist to join a large-scale IBM mainframe environment. You will support the z/OS networking and host subsystems, ensuring data/IP security and system integrity.

You’ll work within a multi-functional team, participate in 24x7 support rotas, and manage VTAM, OSA adapters and IPsec/TLS configurations. Strong problem-solving and collaboration skills are essential.