Mainframe Network Engineer

Mainframe Network Engineer (Hybrid 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. The engineer will work on key technologies such as TCP/IP, VTAM, SNA, Enterprise Extender, TN3270, FTP, and network security controls, supporting critical production workloads in large enterprise environments.

* This role requires employees to live in or around the Phoenix, AZ area. You will be responsible to be onsite 3 days a week. We will consider candidates who are willing to relocate to the area.

Responsibilities:

Mainframe Network Administration:

• 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.