Senior Systems Administrator - Generalist

Summary

HII’s Mission Technologies division is dedicated to delivering cutting-edge solutions that advance national security and defense objectives. This position is part of our Cyber and Intelligence division, which plays a critical role in supporting Enterprise-Level Security and Modernization efforts across IT infrastructure, cybersecurity, physical facilities, and personnel operations.                                                                              

The selected candidate will contribute to a high-impact government program focused on enhancing and securing mission-critical systems and environments. This program launched in early 2026 and due to the classified nature of the mission and the sensitivity of the operational environment, an active TS/SCI security clearance will be required.

This posting is to collect applications for current and future openings for HII Mission Technologies. Candidates will be screened as opportunities come available and selected candidates will be contacted about an opportunity. 

Systems Administrator 3: $105,000 - $145,000

Systems Administrator 4: $120,000 - $160,000

What you will do

You will serve as a senior technical resource responsible for administering, securing, and optimizing both Windows and Linux environments that support critical enterprise and mission workloads.

In this role, you apply deep cross‑platform expertise to ensure systems are designed, configured, and maintained for reliability, performance, and compliance with organizational standards.

Key responsibilities include managing and troubleshooting complex issues across Windows Server and Red Hat/other Linux distributions; performing system installations, configurations, patching, and lifecycle maintenance; and ensuring effective integration with networking, storage, virtualization, and security services.

You will develop and maintain automation to streamline routine operations, contribute to configuration baselines, and support system hardening and vulnerability remediation.

You may also participate in solution design activities such as documenting system architectures, evaluating platform improvements, and supporting deployments of new capabilities.

Additionally, you will provide guidance to junior administrators, conduct system testing, validate operational readiness, and ensure both Windows and Linux systems remain stable, secure, and aligned with enterprise and mission requirements.

What we are looking for

• 7+ years of progressively responsible hands-on systems administration of enterprise server operating systems (Windows Server, Red Hat Enterprise Linux (RHEL)) and server applications (e.g., Active Directory, Exchange, File Services, and SQL server. 
• 5+ years of experience administering a complete Microsoft AD domain and forest functional level, to include domain controllers, global catalogs, LDAP/S, DNS, and DHCP.
• Experience applying and maintaining a standard security configuration based on SRGs and STIGs.
• Must meet DoD 8140/CSWF for 451-Intermedediate or be willing to obtain the appropriate credential within 6 months
• TS/SCI clearance required with ability to obtain CI Poly

System Administrator 3: 7 years relevant experience with Bachelors in related field; 4 years relevant experience with Masters in related field; or High School Diploma or equivalent and 10 years relevant experience. 

System Administrator 4: 10 years relevant experience with Bachelors in related field; 8 years relevant experience with Masters in related field; or High School Diploma or equivalent and 14 years relevant experience. 

Preferred Requirements

• Experience leveraging scripting technologies (e.g., PowerShell, Batch, VBScript) and automated deployment tools and approaches (e.g., Ansible)
• Operating system formal training or vendor certifications from Microsoft or Red Hat.
• Formal training or vendor certifications for applications and technologies such as Citrix, Cisco, Splunk, SolarWinds, ServiceNow