Mainframe Network Admin

Trident Consulting•New York, NY

1d•Remote

About The Position

The Mainframe Network Admin will manage, support, and modernize the mainframe networking environment. The role designs, configures, and supports mainframe network infrastructure, including VTAM, NCP, SNA, and TCP/IP, and troubleshoots session-level connectivity and session management using CA TPX, CL/SuperSession, and related tools. The administrator will lead end-to-end migrations of session management and networking tools to updated or consolidated platforms, maintaining session continuity and minimizing business disruption. This includes configuring session routing, security, and user access; planning, testing, and implementing cutover and rollback strategies; coordinating timelines, dependencies, and risk mitigation with vendors and internal stakeholders; monitoring session performance before and after migration; and maintaining configuration and procedure documentation. The role also ensures security, audit, and regulatory compliance and provides L2/L3 support through an on-call rotation.

Requirements

8+ years of hands-on mainframe networking experience.
Strong expertise in SNA and TCP/IP protocols.
Experience configuring, administering, routing sessions, and troubleshooting CA TPX and CL/SuperSession.
Experience migrating session management tools and network software.
Experience with session continuity and cutover/rollback planning.
Experience with VTAM, NCP, and Communications Server for z/OS.
Troubleshooting, documentation, and stakeholder communication skills.
Ability to lead migrations end-to-end, including validation.

Nice To Haves

Experience with z/OS and related mainframe operating environments.
High expertise handling tools such as CA TPX and CL/SuperSession.
Experience migrating to CL/SuperSession from other platforms.
Knowledge of network security protocols and compliance frameworks.
Experience in BFSI, healthcare, or large enterprise mainframe environments.
Experience with vendor tool transitions and vendor coordination.
L2/L3 support and on-call rotation experience.

Responsibilities

Manage, support, and modernize the mainframe networking environment.
Design, configure, and support mainframe network infrastructure, including VTAM, NCP, SNA, and TCP/IP.
Troubleshoot session-level connectivity and session management functions using CA TPX, CL/SuperSession, and related tools.
Lead and execute migrations of session management and networking tools to updated or consolidated platforms while ensuring session continuity and minimizing business disruption.
Configure CA TPX and CL/SuperSession for session routing, security, and user access.
Plan, test, and implement cutover and rollback strategies.
Coordinate timelines, dependencies, and risk mitigation with vendor teams and internal stakeholders.
Monitor session performance before and after migrations.
Maintain configuration and procedure documentation.
Ensure security, audit, and regulatory compliance.
Provide L2/L3 support on an on-call rotation.