Senior Linux System Administrator

ASEC • Patuxent River, MD

2d • $135,000 - $155,000 • Onsite

About The Position

As the Senior Linux System Administrator, you will be responsible for ensuring secure configurations, producing accreditation artifacts, and maintaining hardened baselines, all with a focus on reliability and long-term system assurance. The ideal candidate is not only technically strong, but also thoughtful, process-oriented, and one who takes a careful, methodical approach to systems management.

Requirements

• 7 years of experience as a system administrator/IT technician supporting DoD classified networks is required.
• Must have a deep level of knowledge and experience with Red Hat Enterprise Linux (RHEL).
• Demonstrated experience with Confluence and Jira, required.
• Ability to build positive, collaborative relationships across teams and with external partners.
• Effective communicator with strong verbal and written skills.
• Proactive, self-directed work style with the ability to operate independently.
• Analytical thinker with proven problem-solving capabilities.
• Highly organized, with the ability to balance competing priorities in a fast-paced environment.
• U.S. citizenship and an active DoD Top Secret clearance.
• Selected candidate will be subject to a government security investigation and must meet eligibility requirements for access to classified information.

Nice To Haves

• A bachelor's degree in a STEM related area of study may be considered in lieu of the full 7 years of experience.
• Familiarity with SolarWinds monitoring and auditing tools, preferred.
• Familiarity with the Red Hat Ansible Automation Platform, preferred.
• Qualified candidates will have the MS Certified Solutions Associate (Windows Server 2016 or later), Red Hat Certified System Administrator, or VMware Certified Professional and one of the following industry certifications: SecurityX/CASP+, CCNA, CCNP Security, CCSP, GCED, GCIA, GCLD, GDSA, GFACT.
• A master's degree or Ph.D. in Engineering, Cybersecurity, Data Science, Information Systems or Information Technology, or Software Engineering may be considered in lieu of one of the listed certifications, however Security+ will be required.

Responsibilities

• Ensuring secure and compliant Linux operating system configurations by applying Defense Information Systems Agency (DISA) Security Technical Implementation Guides (STIGs) to prevent misconfiguration and audit issues.
• Managing vulnerability assessments with Assured Compliance Assessment Solution (ACAS) and EvaluateSTIG, producing accreditation artifacts to maintain Authorization to Operate (ATO) compliance and demonstrate security assurance.
• Maintaining and securing VMware ESXi hypervisors, including patching and hardening host systems to ensure platform reliability.
• Automating all routine administrative tasks — including provisioning, configuration management, patching, compliance checks, and reporting — using Red Hat Ansible Automation Platform, improving consistency and reducing manual error.
• Applying Red Hat Enterprise Linux (RHEL) updates on a monthly basis to maintain a secure, up-to-date environment.
• Refining processes to align with policy, reduce overhead, and collaborating with DevOps and security teams to support modern automation practices.
• Releasing RHEL hardened system templates on a quarterly basis with required documentation and ATO submission, ensuring standardized and compliant deployments.
• Monitoring Linux and ESXi environments for performance, availability, and security issues to sustain system health and resilience.
• Supporting Risk Management Framework (RMF) compliance (FISMA, NIST 800-53, DoD SRG), ensuring alignment with policy and accreditation requirements.
• Maintaining accurate technical documentation in Confluence and using Jira Software for task tracking, ensuring procedural clarity and reducing knowledge gaps.
• Operating and maintaining SolarWinds monitoring and auditing tools to proactively detect anomalies and maintain system integrity.

Benefits

• 100% employee-owned company.
• Comprehensive benefits package, including 11 paid holidays, medical/dental/vision coverage, HSA/FSA options, disability insurance, and more!
• 401(k) with company match
• Tuition assistance for undergraduate and graduate education

What This Job Offers

• Job Type: Full-time
• Career Level: Senior