Senior Systems Administrator – Windows & Linux, TS/SCI

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

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.