Mainframe Network Engineer (z/OS, IPsec/TLS) – Hybrid UK/Europe

NTT DATA; Sheffield; Hybrid; GBP 55,000 - 95,000; Full time

Job summary

NTT DATA in the United Kingdom is seeking an experienced IBM z/OS Network Engineer to support mainframe networks and transmission products within a multi-functional team.

You will participate in a 24x7 rota, manage VTAM/VTAM PU/LU, configure IPsec, and ensure secure SNA/TCP/IP networks under z/OS. The role offers hybrid work with UK/Europe flexibility and a comprehensive benefits package.

Qualifications

• Experience administering file transmission products such as Connect:Direct and FTP.
• 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 such as IPSec, TLS/SSL, and certificates.
• Experience with problem management from initial diagnosis through 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 such as NetMaster, and multi-session manager products such as TUBES and 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 organisational skills.
• Flexibility and adaptability.
• Ability to create and maintain strong working relationships with colleagues and customers.
• Business awareness and understanding of IT business requirements.
• Willingness to keep up to date with developments in new technology.
• Understanding of information legislation such as the Data Protection Act.
• Experience working as a z/OS Systems Specialist in the IT industry.

Responsibilities

• Support IBM mainframe networks and transmission products and infrastructure as part of a multi-functional team.
• Participate in a support rota providing 24x7 cover.
• Perform TCPIP port reserves, including additions, deletions, and changes.
• Perform VTAM updates, including additions, deletions, and changes.
• Manage OSA adapters in a complex mainframe environment.
• Perform VTAM PU/LU updates, including Enterprise Extenders (EE).
• Implement AT-TLS rules, including digital certificate management.
• Configure and manage IPSEC policies, including permit/deny rules and VPN IPsec tunnels.
• Carry out trace, debug, and error analysis.
• Communicate regularly with technical, applications, and operational staff to ensure network connectivity and security, including some after-hours and weekend work.

Skills

File transmission

z/OS knowledge

Network security

Problem management

Change management

SNA/TCP/IP on z/OS

NetMaster

TUBES

Supersession

VTAM

OSA-Express

Cisco familiarity

Communication skills

Teamwork

Deadline management

Organisational skills

Adaptability

Data Protection Act awareness

Tools

NetMaster

TUBES

Supersession

VTAM

OSA adapters

IPsec policies

Job description

NTT DATA in the United Kingdom is seeking an experienced IBM z/OS Network Engineer to support mainframe networks and transmission products within a multi-functional team.

You will participate in a 24x7 rota, manage VTAM/VTAM PU/LU, configure IPsec, and ensure secure SNA/TCP/IP networks under z/OS. The role offers hybrid work with UK/Europe flexibility and a comprehensive benefits package.