Senior Linux System Administrator/System Engineer with Security Clearance

Cornerstone Defense; Annapolis (MD); On-site; USD 190,000 - 210,000; Full time

Benefits offered by this job

Medical, Dental and Vision Plans

401(k)

HSA and FSA options

Tuition Reimbursement and Training

Life and Disability Insurance

Job summary

Cornerstone Defense is seeking a Senior Linux System Administrator/System Engineer to support a high-visibility mission environment. The role focuses on expert administration, engineering, and sustainment of Linux-based systems across secured facilities, with emphasis on CentOS/RHEL, JBoss/WildFly, virtualization, automation, and security compliance.

You will collaborate across mission teams to maintain system reliability, availability, and compliance in a fast-paced setting.

Qualifications

• 10+ years' experience administering Linux in mission environments.
• CentOS/RHEL administration experience.
• Installation, configuration, and sustainment of JBoss/WildFly.
• VMware VM creation, configuration, and operations.
• CompTIA Security+ certification required.

Responsibilities

• Administer and engineer Linux-based systems across secure facilities.
• Support and sustain mission-critical environments to ensure reliability and compliance.

Skills

Linux System Administration

Oracle Database Design

JBoss/WildFly Administration

VMware

Security+ Certification

Automation with Ansible

Scripting (Shell/Python)

Tools

Red Hat Ansible

VMware vSphere

Job description

Title: Senior Linux System Administrator/System Engineer

Location: Annapolis Junction

Compensation Range: $190

210k

Clearance: Active TS/SCI w/ Polygraph needed to apply

Company Overview

Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government. Realizing early on that our most prized assets are our employees, we continually focus our attention on improving the overall work/life experience they have supporting the mission. Our Team is pushed every day to use their industry leading knowledge to provide end-to-end solutions to combat our nation's toughest and most secure problems. If you are looking for a place to not only be professionally challenged, but encouraged and supported by a company that cares, don't look any further than Cornerstone Defense.

Benefits Overview

• Medical, Dental and Vision Plans


• Generous PTO Policy


• 401(k)


• HSA and FSA options


• Life and Disability Insurance


• Tuition Reimbursement and Training


• Perks at Work Discount Program


• Referral Program


• Leads Generation Program


• CollegeAmerica 529


• Fitness Reimbursement Program


• Travel Assistance


• Norton Lifelock Benefit Solutions


• Life Planning Financial & Legal Services

Description

The Sr. System Administrator / System Engineer supports a high-visibility, mission-critical environment by providing expert-level administration, engineering, and sustainment of Linux-based systems across secure facilities. This role requires deep technical proficiency in CentOS/RHEL environments, enterprise middleware (JBoss/Wildfly), virtualization, automation, and secure system operations. The engineer will collaborate across mission teams, and provide support to maintain system reliability, availability, and compliance. The position demands a strong independent work ethic, adaptability, and broad familiarity with modern infrastructure components including storage, networking, security, and scripting.

Required Skills

• 10 + years' experience administering to, and engineering solutions with Oracle's database. Extensive experience with database design and modeling; as well as the collection and interpretation of customer requirements relevant to database migration, troubleshooting, performance observation and tuning.


• Minimum 10 years of experience as a Linux System Administrator or Systems Engineer supporting mission environments.


• Extensive hands-on experience with:


• CentOS / RHEL administration


• Installation, configuration, and sustainment of JBoss/Wildfly


• VMware VM creation, configuration, and operations


• Strong ability to work independently in fast-paced, mission-oriented environments.


• CompTIA Security+ certification required

Desired Skills

• Experience with Red Hat Ansible for automation and configuration management.


• Storage administration


• Networking fundamentals


• Security compliance and hardening


• Authentication systems (e.g., LDAP, Kerberos)


• Scripting (Shell, Python preferred)


• Physical server administration

Additional Desired Skills or Familiarization

• Oracle Database or related DBA experience


• Working with JavaScript Object Notation (JSON)