Mainframe Network Administration

IT Primeinc LLC; Dallas (TX); On-site; USD 110,000 - 150,000; Full time

Job summary

IT Primeinc LLC in Dallas, TX seeks a seasoned Mainframe Networking Specialist to install, configure, and maintain z/OS Communications Server components and TCP/IP on z/OS. You will troubleshoot VTAM, SNA/EE, TN3270, and TLS, ensuring secure connectivity between mainframes and distributed systems.

Responsibilities include DR planning, failover validation, and coordinating with security teams to meet audit requirements.

Qualifications

• Minimum 5+ years of mainframe networking experience.
• Familiarity with JCL, TSO/ISPF, SDSF and related tools.
• Experience with TCP/IP on z/OS and VTAM/SNA/EE.
• Ability to analyze logs and traces to resolve connectivity issues.
• Experience with SSL/TLS and secure data exchange.

Responsibilities

• Install, configure, and maintain z/OS Communications Server components.
• Support and manage TCP/IP configuration on z/OS systems.
• Maintain and troubleshoot VTAM definitions and network resources.
• Configure and support EE and SNA connectivity where applicable.
• Maintain TN3270 access and session-related connectivity for end users and applications.
• Diagnose and resolve connectivity issues involving IP routing and firewall blocks.
• Support file transfer protocols such as FTP, SFTP, and other secure data exchange solutions.
• Work with security teams to enforce secure communication protocols and comply with audits.
• Participate in DR tests, failover validation, and recovery procedures.

Skills

Mainframe networking

z/OS communications

TCP/IP on z/OS

VTAM

SNA/EE

TN3270

TLS

Tools

JCL

TSO/ISPF

SDSF

Connect Direct

FTP/SFTP

Job description

Install, configure, and maintain z/OS Communications Server components.

Support and manage TCP/IP configuration on z/OS systems.

Maintain and troubleshoot VTAM definitions and network resources.

Configure and support Enterprise Extender (EE) and SNA connectivity where applicable.

Maintain TN3270 access and session-related connectivity for end users and applications.

Network Connectivity & Support:

Ensure stable communication between mainframe systems and:

Distributed servers

Internal enterprise applications

Diagnose and resolve connectivity issues involving:

IP routing

Port communication

Firewall-related blocks

Support file transfer protocols such as FTP, SFTP, and other secure data exchange solutions.

Security & Compliance:

Work closely with network security teams to enforce secure communication protocols.

Ensure compliance with enterprise security controls and audit requirements.

Support SSL/TLS certificate implementation and secure transmission standards.

Assist with firewall rule validation, port usage reviews, and vulnerability remediation.

Disaster Recovery & Resiliency:

Support network design and recovery procedures for Disaster Recovery (DR) environments.

Validate communication paths for failover systems and backup data centers.

Participate in DR tests and business continuity exercises.

Required Qualifications:

Minimum 5+ years of experience in

Typically in mainframe networking or z/OS communications support

Familiarity with JCL, TSO/ISPF, SDSF

Ability to analyze logs, traces, and dump information relevant to communications issues

Solid knowledge and experience on TCP/IP on z/OS , VTAM, SNA / Enterprise Extender, TN3270, FTP / SFTP and TLS.

Preferred Experience

Experience in supporting transmission products such as Connect Direct.

The ability to work independently as well as part of a team

Excellent troubleshooting and customer service skills

Participate in on-call rotation with the engineering teams.

The ability to follow a project through to completion, and/or to work as part of a larger team to complete the components of a complex project

IBM mainframe or networking certifications are a plus