Senior Systems Admin & SME - Windows/Linux, Secret Clearance

Apex Systems; Norco (CA); On-site; USD 115,000 - 135,000; Full time

Benefits offered by this job

Medical

Dental

Vision

401K

ESPP

HSA

EAP

Job summary

Apex Systems is seeking a Systems Administrator SME to support a federal defense program at NSWC Corona in Norco, CA. The role requires senior expertise in enterprise IT, security, and server management within a mission-critical environment.

The candidate will collaborate with engineers, cybersecurity teams, and program stakeholders to modernize infrastructure, improve reliability, and ensure compliance. DoD 8570 IAT II certification is required.

Qualifications

• Education & experience options as listed: HS+12+ years in systems administration; or BA with 8+ years; or MS with 5+ years.
• Experience in patching, server operations, and enterprise infrastructure.
• DoD 8570 IAT Level II Certification required.

Responsibilities

• Administer and support Windows and Linux/Unix environments, servers, storage, and network infrastructure.
• Serve as SME for systems and network operations, leading upgrades and security initiatives.
• Install, patch, configure, and upgrade hardware, software, OS, and enterprise apps.
• Monitor performance, troubleshoot complex issues, and implement fixes.
• Maintain network security technologies: firewalls, antivirus, IDS/IPS.
• Support cybersecurity compliance, vulnerabilities, IAVs, and accreditation with ISSO.
• Manage accounts, access, documentation, and CM activities.
• Develop IT policies and operational docs.
• Provide Tier II/III support and end-user training.
• Evaluate system enhancements for reliability, performance, and security.

Skills

Windows/Linux administration

Server deployment & lifecycle

Network troubleshooting

Firewall/IDS/AV

Active Directory

Microsoft Office support

Vulnerability remediation

System monitoring

Documentation & processes

IT security best practices

Education

High School Diploma/GED + 12+ years exp

Bachelor’s Degree in related field + 8+ years

Master’s Degree in related field + 5+ years

Job description

Apex Systems is seeking a Systems Administrator SME to support a federal defense program at NSWC Corona in Norco, CA. The role requires senior expertise in enterprise IT, security, and server management within a mission-critical environment.

The candidate will collaborate with engineers, cybersecurity teams, and program stakeholders to modernize infrastructure, improve reliability, and ensure compliance. DoD 8570 IAT II certification is required.