This is a contract position for a Mainframe Network Engineer based in Phoenix, Arizona, with an expected duration of 12+ months. The role focuses on designing, configuring, implementing, and supporting network connectivity for IBM mainframe environments, ensuring 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
Ensure stable communication between mainframe systems and distributed servers, external vendors/partners, internal enterprise applications, and middleware platforms
Diagnose and resolve connectivity issues involving IP routing, port communication, session failures, DNS resolution, and firewall-related blocks
Support file transfer protocols such as FTP, SFTP, and other secure data exchange solutions
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
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Assist with firewall rule validation, port usage reviews, and vulnerability remediation
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
Qualifications
Demonstrated experience with z/OS Communications Server administration and configuration
Strong knowledge of TCP/IP, VTAM, SNA, and related mainframe networking protocols
Experience with Enterprise Extender (EE) and TN3270 connectivity
Proficiency in troubleshooting mainframe network connectivity issues
Experience with file transfer protocols including FTP and SFTP
Understanding of network security principles, SSL/TLS, and secure transmission standards
Familiarity with firewall configuration and network security compliance
Experience supporting Disaster Recovery and business continuity initiatives
Ability to work effectively with cross-functional teams including security and infrastructure teams
