Mainframe Network Engineer Administration

Job Title: Mainframe Network Engineer (Hybrid Role)Location – Phoenix, AZ (3 days onsite and 2 days WFH )Duration – 6-12+ months with extensionThe 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.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:o Distributed serverso External vendors/partnerso Internal enterprise applicationso Middleware platforms• Diagnose and resolve connectivity issues involving:o IP routingo Port communicationo Session failureso DNS resolutiono 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.