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) Subject Matter Expert (SME) 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

Provide end-to-end support for Mainframe Host Network Systems (HNS), including incident resolution, problem management, and performance optimization
Act as a Network Communications SME, supporting enterprise-grade mainframe customer environments
Administer and maintain z/OS Communication Server components (VTAM & TCP/IP stack)
Perform advanced problem determination using traces, dumps, and logs
Manage and support Policy Agent (PAGENT) configurations and policy-based networking
Provide expertise in TCP/IP configuration, tuning, and troubleshooting
Analyze and resolve network connectivity, performance, and latency issues across host systems
Support VTAM definitions, resources, and session management
Perform network trace analysis (IP traces, packet traces, VTAM traces) to diagnose complex network issues
Participate in project implementations, migrations, and transformation initiatives involving host networking
Ensure system stability, security, and compliance for communication subsystems
Collaborate with cross-functional teams (z/OS SysProg, storage, distributed teams, network engineering)
Support customer escalations and provide timely resolution within SLA commitments

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

10+ years of Experience in Mainframe Networking / HNS support
Proven experience as a Subject Matter Expert in HNS / VTAM / TCP-IP on z/O 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 and our communities. We focus on ensuring all Kyndryls feel included and we welcome people of all cultures, backgrounds, and experiences. Even if you don’t meet every requirement, we encourage you to apply. We believe in growth, and we’re excited to see what you can bring. At Kyndryl, employee feedback has told us that our number one driver of employee engagement is belonging. That sense of belonging — being a valued, respected, trusted member of the team — is fundamental to our culture and fueling great experiences for our customers. This dedication to welcoming everyone into our company means that Kyndryl gives you the ability to thrive and contribute to our culture of empathy and shared success. That’s The Kyndryl Way.

What You Can Expect

Your career with us isn’t just a job—it’s an adventure with purpose. We offer a dynamic, hybrid-friendly culture that supports your well-being and empowers you to grow. Our Be Well programs are thoughtfully designed to support your financial, mental, physical, and social health—because we know that when you feel your best, you do your best.

From your very first day, you’ll dive into impactful work that powers the systems our customers rely on every day. You won’t just contribute—you’ll make a difference, tackling meaningful projects that sharpen your skills and fuel your growth.

We’re here to champion your journey. With powerful tools to chart your career path, personalized development goals aligned with your ambitions, and continuous feedback to keep you inspired and on track, you’ll have everything you need to thrive and evolve. You’ll develop in-demand skills to grow your career and achieve your ambitions with access to cutting-edge learning opportunities—from certifications with Microsoft, Google, and Amazon to coaching and hands-on experiences. And through it all, you’ll be part of a culture that values empathy, restless learning, and a devotion to shared success.

We want you to thrive here—and we’re committed to helping you do just that. Ready to make an impact? Join us and help shape what’s next.

Get Referred!

If you know someone that works at Kyndryl, when asked ‘How Did You Hear About Us’ during the application process, select ‘Employee Referral’ and enter your contact's Kyndryl email address.

Mainframe Host Network Support (HNS) – SME