Mainframe Host Network Support Specialist

Who We Are

At Kyndryl, we run and reimagine the mission-critical technology systems that drive advantage for the world’s leading businesses.  We are at the heart of progress; with proven expertise and a continuous flow of AI-powered insight, enabling smarter decisions, faster innovation, and a lasting competitive edge. For our people—Kyndryls—that means doing purposeful work that powers human progress. Join us and experience a flexible, supportive environment where your well-being is prioritized and your potential can thrive.

The Role

As a Mainframe Host Network Support (HNS) at Kyndryl, you’ll solve complex problems and identify potential future issues across the spectrum of platforms and services. You’ll be at the forefront of new technology and modernization, working with some of our biggest clients – which means some of the biggest in the world.

There’s never a typical day as a System Administrator at Kyndryl, because no two projects are alike. You’ll be managing systems data for clients and providing day-to-day solutions and security compliance. You’ll oversee a queue of assignments and work directly with technicians, prioritizing tickets to deliver the best solutions to our clients.

One of the benefits of Kyndryl is that we work with clients in a variety of industries, from banking to retail. Whether you want to broaden your knowledge base or narrow your scope and specialize in a specific sector, you can find your opportunity here. You’ll also get the chance to share your expertise by recommending modernization options, identifying new business opportunities, and cultivating relationships with other teams and stakeholders. Does the work get challenging at times? Yes! But you’ll collaborate with a diverse group of talented people and gain invaluable management and organizational skills, which will come in handy as you move forward in your career.

Key Responsibilities:

• Lead end-to-end Host Network Services (HNS) support for enterprise mainframe environments.
• Ensure stability, availability, and performance of host network infrastructure.
• Serve as the Subject Matter Expert (SME) for VTAM, TCP/IP, and Communication Server technologies.
• Perform advanced troubleshooting using traces, dumps, packet analysis, and diagnostic tools.
• Drive root cause analysis (RCA) and implement permanent fixes for recurring network issues.
• Manage VTAM configurations, session management, and TCP/IP stack tuning for optimal performance.
• Configure and maintain PAGENT policies while supporting network communication services.
• Conduct deep-dive network diagnostics using IPTRACE, NETSTAT, OSA traces, VTAM traces, and related tools.

Your future at Kyndryl
Every position at Kyndryl offers a way forward to grow your career, from Junior System Administrator to Architect. We have opportunities for Cloud Hyperscalers that you won’t find anywhere else, including hands-on experience, learning opportunities, and the chance to certify in all four major platforms. One of the benefits of Kyndryl is that we work with clients in a variety of industries, from banking to retail. Whether you want to broaden your knowledge base or narrow your scope and specialize in a specific sector, you can find your opportunity here.

Who You Are

You’re good at what you do and possess the required experience to prove it. However, equally as important – you have a growth mindset; keen to drive your own personal and professional development. You are customer-focused – someone who prioritizes customer success in their work. And finally, you’re open and borderless – naturally inclusive in how you work with others.

Required Technical and Professional Expertise

• 7+ years in Mainframe Networking / HNS support
• Strong hands-on experience with VTAM, TCP/IP on z/OS, and z/OS Communication Server
• Expertise in PAGENT (Policy Agent) and strong understanding of network protocols, routing concepts, and SNA/IP networking in mainframe environments
• Proven experience in advanced troubleshooting, including packet trace analysis, performance tuning, debugging, and resolution of complex production incidents
• Solid knowledge of Host Networking Services (HNS) system programming concepts
• Strong understanding of high availability architectures, failover mechanisms, and resilience configurations
• Ability to manage and support mission-critical enterprise production environments
• Demonstrated experience in root cause analysis and technical pro…