Mainframe Host Network Support (HNS)

About the role

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. 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.

Responsibilities

• Technical Leadership & Delivery
• Lead end-to-end HNS support for enterprise mainframe environments
• Own stability, availability, and performance of host network systems
• Act as primary SME for VTAM, TCP/IP, and Communication Server
• Provide advanced troubleshooting using traces, dumps, and packet analysis
• Drive root cause analysis (RCA) and permanent fixes for recurring issues
• Network & System Expertise
• Manage and support:
• VTAM configuration and session management
• TCP/IP stack tuning and performance optimization
• PAGENT policy configurations
• Perform deep-dive analysis using:
• IPTRACE, NETSTAT, OSA traces
• VTAM traces and network diagnostics
• Your future at Kyndryl

Requirements

• 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 problem resolution
• Experience working in customer-facing roles and managed services/global delivery environments
• Preferred Technical and Professional Experience
• Experience with advanced networking technologies such as Enterprise Extender (EE), HiperSockets, and OSA adapters
• Knowledge of security protocols including AT-TLS and IPSec
• Exposure to automation tools and scripting (e.g., REXX, Ansible, or similar)
• Experience with monitoring tools and AIOps platforms
• Prior experience working in large-scale global delivery environments
• Being You
• The "Kyn" in Kyndryl means kinship, which represents the strong bonds we have with each other, our customers an

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