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Introduction

The IBM mainframe (Z Systems) is responsible for most credit card transactions and is used by the many of the top insurers, banks, retailers, and airlines. IBM z/VM® is an operating system with highly secure and scalable hypervisor and virtualization technology designed to run Linux®, z/OS®, z/VSE® and z/TPF virtual machines as well as Red Hat® OpenShift® on IBM zSystems™ and IBM LinuxONE servers. z/VM provides a highly secure and scalable environment for efficiently running critical Linux applications, with support for more Linux virtual servers than any other platform in a single footprint.
The z/VM team is a worldwide team, primarily located in Poughkeepsie, NY with expansion plans in Bangalore, India. All phases of the software life cycle are performed within this team, including the design, development, test, performance, as well as supporting the product in the field with customers. Agile methodologies are used throughout the life cycle.
We are looking for qualified software engineer candidates to be part of our IBM Z Systems team, to help us take z/VM virtualization to the next level on the mainframe.

Your role and responsibilities

We are seeking a mid-level Networking/TCP/IP Developer to join our z/VM team. In this role, you will design, develop, debug, and enhance networking components within the z/VM environment, with a strong focus on TCP/IP, SSL, and network services reliability and performance. Prior experience with IBM Z or z/VM is not mandatory, but candidates should have a solid foundation in networking concepts, operating systems, and low-level debugging, along with the ability to ramp up quickly on new platforms and technologies.

You will work closely with QA, support, and system test teams to deliver robust, secure, and high-performing enterprise networking solutions.

Responsibilities
• Design, develop, and maintain TCP/IP and networking-related components in the z/VM environment.
• Debug and resolve customer- and developer-reported networking issues across development and production systems.
• Analyze network traces, logs, dumps, and packet captures to identify defects and performance bottlenecks.
• Work on SSL/TLS integration and secure communication between z/VM and guest operating systems.
• Collaborate with QA and system test teams to ensure adequate test coverage and validate fixes.
• Participate in root cause analysis (RCA) and drive long-term fixes to prevent recurrence.
• Document design changes, technical findings, and known issues for internal and customer-facing teams.
• Contribute to improving network performance, scalability, and reliability of enterprise workloads.
• Assist during critical customer situations and outages to help restore services quickly.
• Develop or enhance diagnostic, tracing, and automation tools to improve development and troubleshooting efficiency.

This role requires strong problem-solving skills, a deep interest in networking internals, and a commitment to building reliable enterprise-grade software. If you enjoy working close to the system, debugging complex networking problems, and making things work at scale, we’d love to hear from you.

Required education

Bachelor's Degree

Required technical and professional expertise

4 to 7 years of relevant experience in systems software development with a strong focus on Networking and TCP/IP on Linux/Unix-based platforms.

Must-Have Skills

Systems & Operating Systems Expertise
• Minimum 3 years of experience in systems or networking software development on Linux/Unix platforms.
• Strong experience in debugging, troubleshooting, and improving reliability of enterprise-grade systems.
• Good understanding of OS internals, process management, memory, and I/O behavior.

Networking & TCP/IP Development
• Strong hands-on experience with TCP/IP stack, network protocols (L2–L5), and distributed systems.
• Experience developing or debugging network services, socket-based applications, and communication layers.
• Ability to analyze network traces, packet captures, logs, and dumps to diagnose complex issues.

Virtualization & API Integration
• Exposure to virtualization platforms and networking in virtualized environments.
• Good understanding of REST APIs, including integration, performance, and security considerations.
• Experience working with network-based APIs and services.

Linux/Unix & Scripting Expertise
• Extensive experience working in Linux/Unix environments.
• Proficiency in Linux commands and shell scripting (Bash/KSH); Python scripting is a plus.
• Understanding of Linux internals, system performance tuning, and security concepts.

Development & Automation
• Ability to develop, enhance, and maintain diagnostic tools, test utilities, or automation to support development and troubleshooting.
• Experience working with CI/CD pipelines and integrating validation into development workflows.

Network Security & SSL
• Strong understanding of network security concepts, including SSL/TLS, authentication, and secure communication.
• Experience debugging security-related issues in networked environments.

Problem-Solving & Troubleshooting
• Proven ability to analyze and resolve complex issues across system, network, and application layers.
• Strong debugging skills using traces, logs, dumps, and performance tools.

Preferred technical and professional experience

* Experience working with complex systems and abilities to develop new features and able to fix any existing issues.

* Strong team player with good communication and interpersonal skills Proven ability to work effectively in a global team environment

* Proven command over the English language, both written and verbal

Years of Experience:
4 - 7