Mainframe Consultant

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.