Senior Systems Administrator - Generalist

Mission Technologies, a division of HII; Springfield (VA); On-site; USD 105,000 - 155,000; Full time

Job summary

Mission Technologies, a division of HII, is seeking a senior Systems Administrator to secure and optimize Windows and Linux environments supporting critical enterprise and mission workloads. You will apply cross‑platform expertise to ensure systems are reliable, performant, and compliant with standards.

The role requires TS/SCI clearance and DoD 8140 credentialing within 6 months, with strong background in Active Directory, DNS, LDAP, and security baselines.

Qualifications

• 7+ years of hands-on systems administration of enterprise servers and related applications.
• 5+ years administering a complete Microsoft AD domain and forest functional level.
• Experience applying security configurations based on SRGs and STIGs.
• Must meet DoD 8140/CSWF for 451‑Intermediate or be willing to obtain within 6 months.
• TS/SCI clearance required with ability to obtain CI Poly.

Responsibilities

• Administer, secure, and optimize Windows and Linux environments supporting enterprise workloads.
• Manage and troubleshoot Windows Server and Linux distributions, AD, DNS, DHCP, and LDAP.
• Perform installations, patching, lifecycle maintenance, and integrate with networks and storage.
• Develop automation to streamline operations and support system hardening and vulnerability remediation.
• Mentor junior admins and participate in design reviews and deployments.

Skills

Windows Server

Red Hat Enterprise Linux (RHEL)

Active Directory

Exchange Server

SQL Server

PowerShell scripting

Education

Bachelor's degree in related field

Master's degree preferred

Tools

Citrix

Cisco

Splunk

SolarWinds

ServiceNow

Ansible

Job description

Requisition Number: 29085

Required Travel: 0 – 10%

Employment Type: Full Time/Salaried/Exempt

Anticipated Salary Range: $105,000.00 – $155,000.00

Security Clearance: TS/SCI

Level of Experience: Mid

This opportunity resides with Warfare Systems (WS), a business group within HII’s Mission Technologies division. Warfare Systems comprises cyber and mission IT; electronic warfare; and C5ISR systems.

HII works within our nation’s intelligence and cyber operations communities to defend our interests in cyberspace and anticipate emerging threats. Our capabilities in cybersecurity, network architecture, reverse engineering, software and hardware development uniquely enable us to support sensitive missions for the U.S. military and federal agency partners.

Meet HII’s Mission Technologies Division

Our team of more than 7,000 professionals worldwide delivers all‑domain expertise and advanced technologies in service of mission partners across the globe.

Mission Technologies is leading the next evolution of national defense – the data evolution – by accelerating a breadth of national security solutions for government and commercial customers. Our capabilities range from C5ISR, AI and Big Data, cyber operations and synthetic training environments to fleet sustainment, environmental remediation and the largest family of unmanned underwater vehicles in every class.

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 its classified nature and the sensitivity of the operational environment, an active TS/SCI security clearance will be required.

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‑Intermediate or be willing to obtain the appropriate credential within 6 months.
• TS/SCI clearance required with ability to obtain CI Poly.

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.

Pay & Experience Levels

• Systems Administrator 3: $105,000 – $145,000 – 7 years relevant experience with Bachelor’s in related field; 4 years with Master’s; or High School Diploma with 10 years relevant experience.
• Systems Administrator 4: $120,000 – $160,000 – 10 years relevant experience with Bachelor’s; 8 years with Master’s; or High School Diploma with 14 years relevant experience.

The listed salary range for this role is intended as a good faith estimate based on the role’s location, expectations, and responsibilities. When extending an offer, HII’s Mission Technologies division takes a variety of factors into consideration including, but not limited to, the role’s function and a candidate’s education or training, work experience, and key skills.

Equal Employment Opportunity

All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, physical or mental disability, age, veteran status or any other basis protected by federal, state, or local law.

Do You Need Assistance?

If you need a reasonable accommodation for any part of the employment process, please send an e‑mail to [e-mail] and let us know the nature of your request and your contact information. Reasonable accommodations are considered on a case‑by‑case basis. Please note that only those inquiries concerning a request for reasonable accommodation will be responded to from this e‑mail address. Additionally, you may also call 1‑844‑849‑8463 for assistance. Press #3 for HII Mission Technologies.