Senior NGDE Engineer (Linux OS Engineer)

Responsibilities & Qualifications

RESPONSIBILITIES

 

The ​Senior NGDE Engineer (Linux OS Engineer) is expected to be able to accomplish the following:

• Design, deploy, configure, and maintain enterprise Linux environments (RHEL, Rocky, CentOS, Ubuntu, or equivalent). 
• Build and maintain secure Linux OS baselines in accordance with DoD STIGs, NIST, and RMF requirements. 
• Perform system hardening, patch management, and vulnerability remediation for classified environments. 
• Automate system configuration and deployment using tools such as Ansible, Puppet, or similar automation frameworks. 
• Engineer and maintain systems supporting cross-domain data transfer and multi-level security (MLS) environments. 
• Support integration and sustainment of Cross Domain Solutions (CDS) enabling secure data exchange between networks of different classification levels. 
• Collaborate with security teams to ensure proper data flow enforcement, access controls, and auditing in classified environments. 
• Troubleshoot and resolve issues impacting secure information flow between domains. 
• Support the architecture and sustainment of Next Generation Digital Environment (NGDE) platforms. 
• Integrate Linux-based services with enterprise infrastructure including identity management, container platforms, and virtualization solutions. 
• Assist in modernization initiatives including cloud integration, DevSecOps pipelines, and platform automation. 
• Implement and maintain security controls aligned with RMF, NIST 800-53, and DISA STIGs. 
• Conduct system auditing, log analysis, and compliance verification. 
• Support security assessments, ATO processes, and continuous monitoring activities. 
• Ensure all systems meet classified operational security requirements. 
• Monitor system performance, availability, and resource utilization. 
• Implement high-availability solutions and disaster recovery strategies. 
• Provide Tier III engineering support for critical Linux infrastructure. 
• Develop and maintain technical documentation, system diagrams, and standard operating procedures. 
• Participate in engineering design reviews and architecture discussions. 
• Mentor junior engineers and provide technical leadership within the Linux engineering team. 

 

REQUIRED QUALIFICATIONS

• Active TS/SCI + CI Poly clearance
• Bachelor’s degree in Computer Science, Information Systems, Engineering, or related field (or equivalent experience). 
• BS, 10-12 years of relevant experience; MS 8-10 years; PhD, 5-7 years.
• 5–7 years Linux administration experience in enterprise or government environments or 8+ years of experience in Linux system administration or engineering. 
• Security+ CE certification.
• RHCSA or RHCE certification.
• Experience implementing DISA STIGs, NIST controls, and RMF compliance requirements. 
• Ability to create SOPs, playbooks (runbooks), and architecture documentation. 
• Experience troubleshooting across multi-level classification domains.  
• Experience troubleshooting compute, network, storage.
• VMware/KVM familiarity. 
• Deep understanding of designing and implementing ITSM workflows. 
• Hands-on automation experience with Ansible, Bash, Python. 

DESIRED QUALIFICATIONS

• CKA certification
• RHEL Satellite/Foreman, Kickstart, IdM/FreeIPA, HashiCorp Vault. 
• Container/Cloud: Podman, Docker, Kubernetes, AWS/GovCloud, Azure. 
• Terraform, registry/artifact management. 
• Monitoring/SIEM: Prometheus, Grafana, ELK/OpenSearch. 
• Experience working with endpoints that support a multi-level classification environment. 
• Strong proficiency with RHEL and Debian/Ubuntu systems, services, and package management. 
• Deep expertise with enterprise Linux distributions (RHEL preferred). 
• Experience supporting classified environments and cross-domain systems. 
• Strong knowledge of: 
  • Linux system internals 
  • Networking (TCP/IP, routing, firewalls) 
  • System hardening and vulnerability management 
  • Automation tools (Ansible, Bash, Python, etc.) 

Overview

We are seeking a ​Senior NGDE Engineer (Linux OS Engineer) ​ to join our Task Order to build, harden, and sustain mission-critical Linux platforms in a highly secure enterprise on the Defense Intelligence Agency’s Solutions for the Information Technology Enterprise III (SITE III). The ​Senior NGDE Engineer (Linux OS Engineer)​ will engineer, harden, secure, and sustain mission-critical Linux platforms across a highly secure enterprise environment. Responsibilities span li