Mainframe Connectivity Engineer

Relha LLC; Phoenix, Northern (AZ, KY); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Kyndryl is seeking a Mainframe Network Engineer to design, configure, implement, and support 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 technologies such as TCP/IP, VTAM, SNA, Enterprise Extender, TN3270, FTP/SFTP, and TLS, and will collaborate with security teams, participate in DR exercises,

Qualifications

• Minimum 5+ years of experience in Typically 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 (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 and internal enterprise applications.
• Diagnose and resolve connectivity issues involving IP routing, port communication, and firewall-related blocks.
• Support file transfer protocols such as FTP, SFTP, and other secure data exchange solutions.
• Work with network security teams to enforce secure communication protocols and compliance.

Skills

Mainframe networking

TCP/IP

VTAM

SNA / Enterprise Extender

TN3270 connectivity

TLS security

Troubleshooting

On-call readiness

Education

IBM mainframe networking certifications

Tools

z/OS Communications Server

JCL/TSO/ISPF/SDSF

Enterprise Extender / SNA

TLS/SSL implementation

FTP/SFTP

Job description

Kyndryl is seeking a Mainframe Network Engineer to design, configure, implement, and support 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 technologies such as TCP/IP, VTAM, SNA, Enterprise Extender, TN3270, FTP/SFTP, and TLS, and will collaborate with security teams, participate in DR exercises,