Mainframe Network Engineer

Job Description

Job Description

Overview

CTG is seeking a Mainframe Network Engineer for our client.

Location: Phoenix, AZ metro area (Hybrid)
Duration: 6 months with option to convert after 6 months
Citizenship: US Citizens (USC), Permanent Residents (PR), and other EAD holders only (no visa-dependent candidates)

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.

• 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.

• 5+ years of experience in mainframe networking or enterprise infrastructure support
• Strong expertise in IBM mainframe communications (VTAM, TCP/IP, SNA, TN3270, FTP)
• Experience with z/OS networking and subsystem configuration
• Strong troubleshooting, performance tuning, and RCA skills
• Knowledge of enterprise network security principles
• Experience supporting hybrid mainframe and distributed/cloud environments
• Strong documentation and communication skills

• Bachelor’s degree in Computer Science, Information Technology, Engineering, or related field preferred (or equivalent experience)

Excellent verbal and written English communication skills and the ability to interact professionally with a diverse group are required.

CTG does not accept unsolicited resumes from headhunters, recruitment agencies, or fee-based recruitment services for this role.

To Apply: Please apply directly via the provided requisition link. Kindly forward to any interested parties.