Mainframe Network Engineer

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.