UNIX Systems Administrator

ERT, Inc.; Yorktown (VA); On-site; USD 80,000 - 110,000; Full time

Job summary

Sev1Tech is seeking a UNIX Systems Administrator to support NAVSUP Ordnance Information System (OIS) on a mission-critical program. You will provide full infrastructure and platform support from Mechanicsburg, PA or Yorktown, VA, on-site five days a week.

Applicants must have a Top Secret clearance and UNIX server experience, with DoD cybersecurity certifications. The role emphasizes reliability, incident response, and collaboration across teams.

Qualifications

• Active Top Secret clearance required to start.
• U.S. citizenship required for Federal Clearance.

Responsibilities

• Provide full infrastructure and platform support for NAVSUP OIS systems.
• Install, monitor, troubleshoot, and optimize UNIX servers and configurations.
• Maintain system security posture in line with DoD/Navy guidance (RMF, STIG).
• Plan, perform disaster recovery, backups, and data integrity checks.
• Collaborate with cross-functional teams to ensure mission-critical reliability.

Skills

UNIX administration

Security+ or equivalent

System monitoring

Disaster recovery

On-call support

Education

Bachelor's degree in CS/IS/Engineering

Tools

STIG/IAVA

ACAS

RMF

AWS SysOps

Job description

UNIX Systems Administrator

• ID: 2026-9913
• Type: Full Time W/Benefits Ret Match
• Location: US-VA-Yorktown
• Secondary Location: US-PA-Mechanicsburg
• Security Clearance: Top Secret

Overview / Job Responsibilities

Sev1Tech is looking for a UNIX Systems Administrator for the Naval Supply Systems Command (NAVSUP) Ordnance Information System (OIS) to provide technical expertise on a mission-critical program whose purpose is to develop, modernize, enhance, operate, and maintain services for OIS mission critical systems. The UNIX Systems Administrator will provide full infrastructure and platform support of critical systems and applications out of Mechanicsburg, PA, or Yorktown, VA (preferred).

This is a full time, 5-days / week onsite position, either in Mechanicsburg PA, or Yorktown VA

Salary Range: $80,000 - $110,000

The Systems Administrator (UNIX) primary responsibilities include:

• Operations experience on a largescale computer system or a multiserver LAN.
• Applies extensive technical expertise and has full knowledge of other related disciplines.
• Develop technical solutions to complex problems which require the regular use of ingenuity and creativity.
• Optimizes system operation and resource utilization and performs system capacity analysis and planning.
• Install, update, troubleshoot, monitor, optimize and maintain system(s)/server(s) and associated configurations.
• Manage system/server resources including performance, capacity, availability, serviceability, and recoverability of UNIX systems for production as well as development, test and COOP platforms.
• Conduct periodic system maintenance including cleaning, disk checks, routine reboots, data dumps, and testing.
• Provide system software maintenance and enhancement support which shall include evaluating and optimizing systems software, analyzing new software releases to determine impact on existing applications, maintaining, testing, and debugging system software, installing releases, and maintaining various utilities, providing assistance to users of systems software, and preparing and editing system documentation.
• Complete After Action Reports (AAR) for all abnormal operations or other required reporting for system incidents.
• Develop and document OIS systems administration standard operating procedures and comply with organization systems administration standard operating procedures.
• Be responsible for Cybersecurity and security posture across all systems/servers and maintain baseline system security according to organizational policies. This responsibility includes, but not limited to maintaining the Information Assurance Vulnerability Management (IAVM) and Security Technical Implementation Guides (STIG), Computer Network Defense (CND) Directives, and all other DoD/Navy Cybersecurity instructions as they become applicable, such as Risk Management Framework (RMF), to keep servers in compliance at both primary and failover sites.
• Provide after-hours support as needed. On-call support is split across System Administrator team throughout the year.
• Manage accounts, network rights, and access to systems and equipment per OIS Access Control Plan.
• Plan, execute, and verify data redundancy and system recovery procedures.
• Monitor scheduled backups and restore files (server baselines), as requested.
• Other duties as needed

Minimum Qualifications

• Must have fully adjudicated DOD T5 background check (Top Secret Clearance) to start; U.S. Citizen required only for Federal Clearance Requirement
• Certification Requirement: Directive 8570.1/8140 - IAT II:
  • Baseline cert (required to start): Security+ (or CCNA- Security, SSCP, CySA+, or GICSP)
  • Computing Environment Cert (must obtain within 3 months if not in hand): CompTIA Server +, or Solaris 7 (or newer), or AWS SysOps Administrator Associate or similar equivalent Cloud environment certification.
• Bachelor's degree (or equivalent experience) in Computer Science, Information Systems, Engineering, Business, or other related technical discipline.
• Minimum seven (7) years' experience in administrating UNIX Server operating systems, including maintaining, troubleshooting, performance monitoring, and disaster recovery.
• Experience in evaluating, developing, and/or analyzing information systems (IS) or information technology (IT) applied to information architectures, to include the use of client-server systems, distributed databases, both wide-area and local-area communications. Must be a self-starter, strong leader, and have the ability to work independently with little supervision.

Desired Qualifications

• ACAS scan and remediation experience
• HBSS experience
• Knowledge of Navy IT systems, specifically Naval Ordnance Information System
• SAFe experience and knowledge

About Us

Formed through the strategic union of Sev1Tech and ERT, Entarian is a premier provider of mission-critical engineering and technology solutions. Founded on a legacy of excellence dating back to 1993, Entarian is a product of an evolved and fully diversified engineering and federal technology leader. From deep space to defense and civilian missions, Entarian delivers secure, mission-aligned digital solutions that drive national resilience and operational effectiveness. We don't just support modernization; we define it.

Join the Mission and Start your Career Journey:

Entarian is an Equal Opportunity and affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status.