Network Engineer, Information Security

Position Summary

Walmart is looking for a senior‑level engineer to assist in the design, implementation, and modernization of our Network Access Control (NAC) capabilities. This role will drive a multi‑year strategy that spans 802.1x deployment, TACACS automation, posture enforcement, and the development of infrastructure‑as‑code strategy. The ideal candidate combines deep NAC expertise with strong automation and infrastructure‑as‑code skills, and is comfortable working across large, distributed, multi‑vendor environments.

At Walmart, we prioritize innovation and data security. Our team is dedicated to maintaining a secure operating environment and preserving the trust of our customers, associates, and stakeholders. We combine a range of services and expertise to prevent fraud, detect threats, and manage digital risk and access. Our focus is on mitigating attack risks, securing cloud transformation, and fostering a culture of security and reliability within our team.

• Help lead the technical execution of Walmart’s NAC strategy, including major initiatives in 802.1x, TACACS, and ZTA posture enforcement.
• Design, deploy, and support NAC policies and controls across campus, stores, and distribution centers.
• Build and maintain automation workflows that eliminate repetitive operational tasks.
• Develop infrastructure‑as‑code modules and workflows to manage NAC systems and supporting infrastructure in a modern, declarative way.
• Partner closely with teams across Global Tech and Info Sec to deliver integrated solutions.
• Troubleshoot complex NAC issues involving RADIUS, TACACS+, switch port behavior, endpoint posture, and authentication flows across Cisco and Juniper environments.
• Contribute to the evaluation of platforms including viability assessments, POCs, and architectural recommendations.
• Create technical documentation, diagrams, and playbooks to support both operational teams and leadership.

• Extensive hands‑on experience with 802.1x for wired and wireless networks, including authentication flows, EAP methods, and switch port enforcement.
• Deep understanding of Cisco ISE architecture and configuration, including RADIUS, TACACS+, policy sets, profiling, and posture assessment.
• Experience working in mixed network environments, including Cisco Catalyst/NX‑OS and Juniper EX/Mist.
• Practical experience automating infrastructure or network operations using tools appropriate to the environment, such as:
• Background in infrastructure as code using tools like Terraform or similar, with the ability to manage infrastructure through version‑controlled declarative configuration.
• Scripting or orchestration frameworks used in network automation.
• API‑driven automation for network and security platforms.
• Solid networking background to include access layer switching, load‑balancing, firewalls, and routing.
• Familiarity with Zero Trust concepts and how NAC fits into device posture, identity, and least‑privilege access models.
• Experience designing RBAC models and command authorization workflows for network infrastructure.
• Strong communication skills and the ability to work cross‑functionally in a large enterprise.
• Experience running technology evaluations, vendor assessments, or RFP/RFI processes is a plus.

Imagine working in an environment where one line of code can make life easier for hundreds of millions of people. That’s what we do at Walmart Global Tech. We’re a team of software engineers, data scientists, cybersecurity experts, and service professionals within the world’s leading retailer who make an epic impact and are at the forefront of the next retail disruption.

People are why we innovate, and people power our innovations. We are people‑led and tech‑empowered. We train our team in the skillsets of the future and bring in experts like you to help us grow. We have roles for those chasing their first opportunity as well as those looking for the opportunity that will define their career. Here, you can kickstart a great career in tech, gain new skills and experience for virtually every industry, or leverage your expertise to innovate at scale, impact millions and…