Senior Mainframe Networking Engineer

Kyndryl Inc.; Phoenix, Northern (AZ, KY); Hybrid; USD 110,000 - 160,000; Full time

Job summary

Kyndryl Inc. is seeking a seasoned Mainframe Network Engineer in Phoenix to design, implement, and support high‑reliability network connectivity for IBM mainframe environments.

You will work with TCP/IP, VTAM, SNA, Enterprise Extender, TN3270, and secure data transfer, ensuring secure and performant operations across enterprise systems. Join a diverse team and collaborate with security, middleware, and partner groups to maintain robust mainframe networks, support disaster recovery, and drive

Qualifications

• 5+ years of experience in mainframe networking or z/OS communications support.
• Familiarity with JCL, TSO/ISPF, SDSF.
• Ability to analyze logs, traces, and dump information relevant to communications issues.
• Solid knowledge and experience on TCP/IP on z/OS, VTAM, SNA / Enterprise Extender, TN3270, FTP / SFTP and TLS.

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 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, 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.
• 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.
• Support network design and recovery procedures for disaster recovery environments.
• Validate communication paths for fail‑over systems and backup data centres.
• Participate in DR tests and business continuity exercises.

Skills

Mainframe networking

z/OS TCP/IP

VTAM/SNA

TN3270

TLS security

Education

Bachelor’s degree in CS/EE

Tools

Connect Direct

SFTP

Job description

Kyndryl Inc. is seeking a seasoned Mainframe Network Engineer in Phoenix to design, implement, and support high‑reliability network connectivity for IBM mainframe environments.

You will work with TCP/IP, VTAM, SNA, Enterprise Extender, TN3270, and secure data transfer, ensuring secure and performant operations across enterprise systems. Join a diverse team and collaborate with security, middleware, and partner groups to maintain robust mainframe networks, support disaster recovery, and drive