Mainframe Network Engineer

About the role

The Mainframe Network Engineer is responsible for the design, configuration, implementation, and support of network connectivity for IBM mainframe environments. This role ensures reliable, secure, and high-performing communication between mainframe systems, distributed platforms, external partners, and enterprise applications.

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 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, External vendors/partners, Internal enterprise applications, Middleware platforms. Diagnose and resolve connectivity issues involving: IP routing, Port communication, Session failures, DNS resolution, 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.

Requirements

• Minimum 5+ years of experience in mainframe networking or z/OS communications support.
• Familiarity with JCL, TSO/ISPF, SDSF.
• Solid knowledge and experience on TCP/IP on z/OS, VTAM, SNA / Enterprise Extender, TN3270, FTP / SFTP and TLS.
• Experience in supporting transmission products such as Connect Direct.

Preferred Experience

• 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.

Skills

• IBM mainframe or networking certifications are a plus.

Benefits

• State-of-the-art resources and Fortune 100 clients.
• Opportunities for innovation, building new capabilities, new relationships, new processes, and new value.
• Employee learning programs with access to certifications from leading providers.
• Volunteering and giving platform to donate, start fundraisers, volunteer, and search non-profits.
• Investment in employee success through learning and development programs.