IBMz Network Engineer

NTT
Madrid
Workplace: OnsiteFull timeFunction: IT Operations (Systems/Network Admin)Skills: ["Problem-solving","Analytical skills","Communication","Teamwork","Negotiation","Organizational skills","Adaptability"]

Support IBM mainframe z/OS network connectivity and security for a large-scale z/OS systems platform. Configure and maintain host communication subsystems, manage TCP/IP and VTAM changes, and administer OSA adapters, PU/LU updates, and routing/integration components. Participate in a 24x7 support rota, implement AT-TLS and IPsec policies, troubleshoot network issues, and coordinate with technical and operational teams to maintain secure, reliable transmissions.

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FursaFursa
NTT
NTT
3 days ago

IBMz Network Engineer

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Last checked: 2 days agoStatus: Live

Job Summary

Support IBM mainframe z/OS network connectivity and security for a large-scale z/OS systems platform. Configure and maintain host communication subsystems, manage TCP/IP and VTAM changes, and administer OSA adapters, PU/LU updates, and routing/integration components. Participate in a 24x7 support rota, implement AT-TLS and IPsec policies, troubleshoot network issues, and coordinate with technical and operational teams to maintain secure, reliable transmissions.
Location: Madrid
Workplace: Onsite
Employment Type: Full time
Job Function: IT Operations (Systems/Network Admin)

Key Responsibilities

  • •Support a large-scale z/OS systems platform by administering IBM mainframe networks and transmissions infrastructure.
  • •Perform and control TCP/IP Port Reserves (additions, deletions, changes) and execute VTAM updates (additions, deletions, changes).
  • •Manage OSA adapters in a complex mainframe environment and perform VTAM PU/LU updates including Enterprise Extenders (EE).
  • •Implement AT-TLS rules and configure/manage IPsec policies (permit/deny rules and VPN IPsec tunnels).
  • •Trace, debug, and troubleshoot network connectivity and security issues, coordinating with technical, applications, and operational staff (including after-hours/weekend work as needed).

Key Requirements

  • •Experience administering file transmissions products such as Connect:Direct and FTP, or strong user experience with these products.
  • •Knowledge of z/OS and z/OS utilities, including z/OS networking services, structure, and related software and protocols.
  • •Understanding of network security disciplines (IPSec, TLS/SSL, digital certificates) as they relate to file transmission.
  • •Experience managing mainframe networks under z/OS, including TCP/IP and secure SNA/TCP/IP networks, plus mainframe network management tools (e.g., NetMaster, TUBES, Supersession).
  • •Problem management experience from diagnosis through resolution, with familiarity of the change management process.
Experience:MainframeZ/OSNetwork securityFile transmissionsIT industry
Skills:Problem-solvingAnalytical skillsCommunicationTeamworkNegotiationOrganizational skillsAdaptability
Tech Stack:Z/OSZ/OS utilitiesIBM mainframeTCP/IPVTAMVTAM PU/LUOSA adaptersOSA-ExpressEnterprise Extenders (EE)AT-TLSIPsecTLS/SSLCertificatesConnect:DirectFTPNetMasterTUBESSupersessionSNACisco Network Solutions

Company Brief

NTT
Dimension Data, operating under NTT Ltd, provides managed IT services, cloud and data center solutions, networking, cybersecurity, and digital transformation services to enterprise customers worldwide.
Industry: Professional Services
Company Size: Enterprise (1,001+ employees)
Revenue: USD 1B+
Growth: Established Company
Valuation: Public Company (Market Cap in USD)
Headquarters: London, United Kingdom
Founded: 1983
WebsiteLinkedIn