Linux System Administrator

Job Title: Linux System Administrator

Location: Reston

Clearance Requirement: TS/SCI w/ CI Poly

*Compensation Range: $100K - $159K

Join Plus3 IT Systems! We are at the forefront of cloud computing, providing comprehensive and cutting-edge solutions across a wide array of critical domains. But we don't stop at implementing technology; we are trusted advisors, delivering expert analysis to fully understand our clients unique challenges and objectives. Our passion is all about empowering our customers to reach their strategic goals. This mission is fueled by our exceptional teams of innovative technology practitioners, who bring deep technical skills and an unwavering commitment to excellence. At Plus3 IT, we foster agile, collaborative processes, working hand-in-hand with our clients to ensure transparency, flexibility, and ultimately, their success in the cloud.


If you're a talented and driven individual seeking a fulfilling career where your technical skills, passion, and ideas are valued, and where you'll be part of a supportive and forward-thinking team, we invite you to explore opportunities with us.

What You'll Do:

• Provision, maintain, and administer enterprise Linux environments (primarily CentOS and RHEL).
• Oversee package installation, update pipelines, and dependency management across internal systems.
• Ensure infrastructure compliance with federal security frameworks, executing RMF controls and applying DISA STIGs.
• Diagnose and resolve system performance issues, network connectivity, and storage configurations with minimal guidance.
• Maintain core networking capabilities, ensuring proper integration with system services and routing.
• Adapt quickly to changing project scopes, organizational needs, and emergency support demands.

QUALIFICATIONS

Minimum Requirements:

• US Citizen
  • Education & Experience:
    • Ph.D.: 0+ years of experience required.
    • Master's Degree: 3+ years of experience required.
    • Bachelor's of Science Degree: 5+ years of experience required
    • 4 additional years of experience may be substituted for a BS degree
• Proven experience configuring and supporting CentOS and/or Red Hat Enterprise Linux (RHEL).
• Hands-on experience working within the Risk Management Framework (RMF) and implementing Security Technical Implementation Guides (STIGs), preferred.
• Strong familiarity with RPM, YUM, DNF, and dependency resolution workflows.
• Solid understanding of core networking concepts (TCP/IP, DNS, DHCP, routing, subnets, and firewalls).
• Ability to troubleshoot technical challenges and execute complex tasks independently without heavy supervision.
• Comfort managing multiple competing priorities in a dynamic work environment.

Certifications Needed:

• Security + or higher
• Cloud certification from any of the major Cloud providers, AWS Preferred

What You'll Love About Plus3:

• Flexible Paid Vacation
• 11 Paid Holidays
• 401(k) with company match
• 100% Employer paid Health, Dental, and Vision for employees
• Professional Development/Tuition Assistance program

What You'll Bring to Plus3:

• A passion for working on cutting-edge, high-profile projects and a drive for delivering solutions
• An insatiable curiosity: you ask why, proactively exploring and sharing ideas
• A love for learning new technologies and sharing them with your team
• A keen interest in utilizing Cloud-based and Open Source tools for problem-solving
• Strong verbal and written communication skills for effective collaboration with customers, vendors, and engineering teams to solve complex business problems

EEO: At Plus3 IT Systems, we believe our success is driven by the contributions of every employee. As an Equal Opportunity Employer, we make employment decisions based solely on an individual's qualifications, skills and merit, and without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class. We are committed to providing access, equal opportunity, and reasonable accommodation for individuals with disabilities in employment, its services, programs, and activities. To request reasonable accommodation, contact View email address on click.appcast.io.

*Compensation: Actual compensation will be determined based on the candidate's specific blend of experience, qualifications, and performance location. Salaries or compensation for part-time roles may be prorated or adjusted based upon the agreed upon number of hours to be regularly worked.

Benefits: Plus3 IT Systems offers eligible employees a variety of benefits including Employer-paid health, dental, vision, life, short/long term disability, contribution to health savings account, 401(k) matching, parental leave, flexible paid vacation, and company paid holidays. A full listing of available benefits can be viewed at

Application Duration: The anticipated duration for applications is 30 days from the date of posting. Please note that this timeframe is subject to change-it may be extended or shortened-based on business requirements and the availability of qualified applicants.

Position: This is a full time position and work days are Monday through Friday. Specific work hours are established with Team Lead. Work location may vary, including onsite requirements which are outlined in the requirements and confirmed with Team Lead.