Linux System Engineer

Leidos; United States; On-site; USD 87,000 - 157,000; Full time

Job summary

Leidos in Oklahoma City, OK is seeking a Linux System Engineer to design, deploy, and optimize enterprise infrastructure supporting classified systems for AFLCMC. The role emphasizes automation, lifecycle management, and secure, scalable operations across DoD environments.

The candidate will install and manage Linux servers, ensure high availability, perform security hardening per DoD standards, and collaborate across engineering teams to modernize infrastructure while maintaining rigorous

Qualifications

• US Citizen with TS clearance and ability to obtain SCI before start date.
• DoD 8140/8570 certification or equivalent required.
• Experience with Linux and Windows, virtualization, core services, storage, networking, and systems integration.
• Ability to deploy, maintain, and troubleshoot complex environments with automation and security in mind.
• Proactive, self-starter with strong communication skills and accountability.

Responsibilities

• Install, configure, maintain, and patch Linux servers both physical and virtual.
• Monitor, troubleshoot, and optimize performance for high availability and readiness.
• Manage OS updates, security hardening, and DoD policy compliance.
• Support backups, disaster recovery, and data integrity.
• Administer system access, accounts, and security configurations.
• Collaborate with teams for deployments, software integration, and modernization.
• Document configurations and procedures; maintain documentation.
• Resolve incidents related to performance, availability, or security, and drive improvement.
• Promote knowledge sharing and cross-team collaboration.

Skills

Windows & Linux systems

Networking fundamentals

Automation & scripting

Independent / self-starter

Problem solving

Education

Bachelor's degree with 4+ years experience

Master's degree with 2+ years experience

DoD 8140 Intermediate / DoD 8570 IAM Level II

Tools

AWS

Azure

VMware ESXi

Microsoft Hyper-V

Red Hat Satellite

Ansible

ServiceNow

Jira Service Management

PKI / RSA / certificate mgmt

RS Authentication Manager

Job description

Description

The Defense Sector at Leidos is seeking a Linux System Engineer to support a fast-paced program with the Air Force Life Cycle Management Center (AFLCMC). In this role, you will design, deploy, maintain, and optimize enterprise infrastructure supporting classified mission systems. Working closely with cross-functional teams, you’ll help deliver reliable, secure, and scalable infrastructure while supporting system deployments, lifecycle management, automation, and operational readiness.

This position requires 100% on-site support in Oklahoma City, OK.

Why This Role Matters

• Modern mission systems depend on resilient, well-engineered infrastructure. As mission requirements evolve, organizations face increasing complexity from system integration, infrastructure modernization, and the need to deliver capabilities efficiently without sacrificing reliability or security.
• As a Linux System Engineer, you’ll help build and sustain the foundational platforms that enable mission success. You’ll improve automation, standardization, and operational efficiency while delivering infrastructure that is reliable, scalable, and easier to deploy, manage, and maintain across enterprise environments.

What You’ll Bring

• You have experience supporting enterprise or classified infrastructure with a strong understanding of Windows and Linux systems, virtualization, enterprise core services, storage, networking, and systems integration. You are comfortable deploying, maintaining, and troubleshooting complex environments while improving automation, reliability, and operational efficiency.
• Most importantly, you’re a self-starter who values accountability, continuous improvement, and technical excellence. You exercise sound judgment, work effectively with minimal oversight, and serve as a trusted engineering partner to both technical teams and leadership.
• If you’re looking for an opportunity to modernize mission-critical infrastructure, influence technical direction, and make a measurable impact supporting national defense, we’d like to talk with you.

Primary Responsibilities:

• Install, configure, maintain, and patch physical and virtual Linux servers.
• Monitor, troubleshoot, and optimize system performance to ensure high availability, reliability, and operational readiness.
• Manage operating system updates, security hardening, and configuration changes in accordance with DoD policies and standards.
• Support system backups, disaster recovery, and data integrity to ensure business continuity.
• Administer system access, user accounts, and security configurations.
• Collaborate with cross-functional teams to support system deployments, software integration, and infrastructure modernization.
• Maintain accurate system documentation, configuration records, and operational procedures.
• Respond to and resolve infrastructure and system issues, including performance, availability, and security-related incidents.
• Promote knowledge sharing, continuous improvement, and technical collaboration across the team.

Basic Qualifications:

• US Citizen with at least a Top Secret clearance and the ability to obtain a SCI prior to your start date
• Bachelor's degree with 4+ years of experience or Master's degree with 2+ years of experience. Additional years of experience will be considered in lieu of a degree
• DoD 8140 Intermediate certification or DoD 8570 IAM Level II certification (or higher)
• Foundational experience with cloud platforms such as AWS and Azure
• Experience administering Linux and Windows environments, including networking fundamentals and common protocols (HTTP, HTTPS, SSL/TLS, SMTP, DNS).
• Problem-solving and analytical skills, with the ability to bring structure and clarity to ambiguous or unstructured information.
• Self-starter that can work independently while possessing excellent interpersonal, verbal and written communication skills.

Preferred Qualifications:

• US Citizen with an active TS/SCI security clearance
• Linux certifications (RHCSA, RHCE, CompTIA Linux+)
• Experience administering Red Hat Satellite
• Experience with virtualization platforms, including VMware ESXi and Microsoft Hyper-V
• Experience with enterprise infrastructure services, including PKI, certificate management, RSA Authentication Manager, RDS, and VDI
• Experience automating system administration using Ansible, including developing custom playbooks
• Familiarity with ITSM platforms such as ServiceNow and Jira Service Management

If you’re looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We’re not hiring followers. We’re recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We’re already at step 30 - and moving faster than anyone else dares.

Original Posting:

August 10, 2026

Pay Range:

Pay Range $87,100.00 - $157,450.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

About Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com .

Pay and Benefits

Pay and benefits are fundamental to any career decision. That’s why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits .

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at [e-mail] .

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission .

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.