Sr Linux Administrator with Security Clearance

Job Title: Senior Linux Administrator
Location: Arlington, VA (Onsite)
Clearance: Active TS/SCI Clearance Required
Company: Quantum Science Solutions (QSS)
Compensation: Open Rate
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Position Overview
Quantum Science Solutions (QSS) supports a mission-critical program focused on modernizing network operations and maintaining a Cyber Threat Intelligence Database across multiple domains.
We are seeking a Senior Linux Administrator with strong Linux engineering, database, automation, and cloud integration experience. This role will support and optimize a complex Threat Intelligence Platform while improving system security, patching, automation, performance, and operational efficiency across enterprise environments.
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Key Responsibilities

• Engineer and maintain Linux environments, primarily RHEL 8/9/10 and AWS Linux.
• Perform OS security hardening, patching, lifecycle maintenance, backup, recovery, and configuration management.
• Develop and standardize patching methodologies across AWS, Azure, and Google Cloud environments.
• Automate administrative and patching processes to improve efficiency, security, and system performance.
• Integrate cloud-native services to improve the resilience, scalability, and performance of DevOps and patching infrastructure.
• Support PostgreSQL databases, including troubleshooting and recreating user issues to identify potential solutions.
• Evaluate and integrate AI capabilities into the Threat Intelligence Platform.
• Coordinate with CISA teams, government sponsors, tenants, and external vendors to resolve complex technical issues.
• Establish and track operational metrics, including patch compliance, deployment timelines, and automation improvements.
• Support enterprise cloud, DevOps, testing, implementation, and continuous improvement standards.

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Mandatory Skills

• U.S. Citizenship.
• Active TS/SCI clearance.
• Ability to obtain Department of Homeland Security (DHS) Suitability.
• Five (5) or more years of Linux systems administration experience; RHEL 8/9/10 preferred.
• Strong Linux engineering experience.
• Experience with PostgreSQL databases.
• Experience with performance tuning and troubleshooting across compute, network, and storage layers.
• Knowledge of general networking concepts and/or AWS networking and security.

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Preferred Skills

• Experience working in development and classified environments.
• Experience with SELinux, multilevel security systems, or Cross Domain Solutions.
• Experience coordinating with external vendors on technical issues, customer requirements, and feature requests.
• Experience with HTTP APIs and authentication using API keys and OAuth tokens.

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Education
Bachelor's degree in Computer Science, Computer Engineering, Computer Information Systems, Computer Systems Engineering, or a related technical discipline.
OR
High School Diploma with seven (7) or more years of lab management, systems administration, or directly related experience.
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Desired Certifications

• DoD 8570.1 IAT Level II
• CompTIA Linux+
• Red Hat Certified System Administrator (RHCSA)

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Why QSS?
At QSS, you'll support a mission-critical federal cybersecurity environment while helping modernize Linux, cloud, database, automation, and Threat Intelligence capabilities that strengthen CISA operations.
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Benefits Include:

• Competitive compensation with annual performance bonuses
• Premium Medical, Dental & Vision coverage
• Generous PTO plus Federal Holidays
• 401(k) with company match