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# Sr. Linux/Network Engineer

- **Company:** ECS Limited
- **Location:** Sierra Vista, AZ, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Data Analysis, Network Operating System (NOS), Cisco IOS, Cyber Security, Computer Networks, System Configuration, Data Centers, Linux, File Systems, Monitoring of Systems, IPv4, IPv6, Virtual Private Networks (VPN), Linux Servers, Network Architecture, Routing, Package Management Systems, Red Hat Enterprise Linux, Ansible, Server Virtualization, VMware Virtualization, VMware VSphere, Network Routers, Nx-os, Firewalls (Computer Science), SC Clearance, Selinux, Information Technology, Docker, Vmware
- **Published:** November 11, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9305665/sr-linuxnetwork-engineer

## About the Role

* Minimum Top-Secret clearance is required
 * Compliance with DoD 8140 / 8570 IAT Level II certification prior to start date
 * 5+ years support in Network and IT Security
 * CCNA or equivalent / CCNP preferred
 * Red Hat Certified System Administrator (RHCSA)
 * Security+ or equivalent
 * Bachelor's Degree in a computer science related field or 6 years' experience

Desired Skills

 * Experience with building, troubleshooting, operating, and maintaining IT Networks
 * In-depth understanding and practical knowledge of IPv4/IPv6, ACLs, Routing, Switching, and Firewalls
 * Experience managing and supporting SDDC's such as VMware NSX-T Data Center
 * Comprehensive understanding of Operating Systems, such as Extreme Network OS, Cisco IOS/IOS-XE/NX-OS, Linux, Windows
 * Basic understanding of VMware products, such as vSphere and vRealize: Log Insight (vRLI), Network Insight (vRNI), and Operations (vROps)
 * Experience in Extreme VDX Series Switches or similar technology is a huge plus
 * Experience managing and supporting RHEL7/8 and CentOS7 servers in a DoD environment.
 * Comprehensive understanding of network infrastructure.
 * In-depth understanding and practical knowledge of NFS filesystems, SELinux, and RPM package management.
 * Experience with building and troubleshooting virtual servers in a VMware virtual environment.
 * Experience securing Linux servers to DoD STIG standards.
 * Experience with Docker containers or similar technology is a huge plus.
 * Experience with Ansible automation or similar technology is a huge plus.
 * Experience Red Hat Satellite servers is a huge plus.

## Description

As an Infrastructure/Linux Engineer, you will support ECS's Army Endpoint Security Solution (AESS) program. ECS is seeking a talented Sr. Linux/Network Engineer to work in the Sierra Vista, AZ area and perform the following duties.

 * Hands-on configuring and managing Routers, Switches, Firewalls, and Virtual Private Networks (VPNs)
 * Deploy, configure, and maintain virtual Linux servers on secure and unsecure networks.
 * Perform routine maintenance and updates on servers to resolve performance and security issues.
 * Participate/troubleshoot performance issues on 3rd party Linux applications.
 * Provide documentation such as STIG Checklists, CRQs/RFCs, and Diagrams
 * Utilize CRM tools to request/track changes to the servers and infrastructure
 * Communicate technical information to team members regarding server performance and sizing issues
 * Troubleshoot and analyze data/packet flows using TCPDUMPs, PCAPs and other analytics
 * Implement/operate diagnostics and monitoring tools to detect/prevent/repair anomalous server behavior.
 * Perform ad hoc projects support, analysis, and reporting as needed
 * Some travel to CONUS and OCONUS locations may be required.