Senior Systems Administrator Secret or Top Secret Clearance

S2i2 Inc; Arlington (VA); On-site; USD 100,000 - 106,000; Full time

Job summary

S2i2 Inc is hiring a Senior Systems Administrator for our Pentagon-area, Arlington, VA on-site site. You will ensure operational stability, security, and maintenance of server and network systems in the DISA JSP environment.Responsibilities include configuring Windows servers, managing Active Directory, DNS, DHCP, VMware, patching, log monitoring, backups, and DIARMF compliance.

The role requires Active clearance and willingness to work nights/weekends if needed.

Qualifications

• Active clearance (Secret or Top-Secret) is required.
• DoD 8140/8570 IAT II (Security+ CE or higher) certified.
• Bachelor's degree in IT or engineering.
• Minimum 5 years of Windows server administration experience.
• Experience with AD/DNS/DHCP and VMware.
• Experience patching and maintaining DoD STIGs.
• Enterprise workstations, servers, and VMs support.
• Understanding of DIARMF will help.
• Ability to work nights/weekends if needed.

Responsibilities

• Perform day-to-day maintenance of servers and networks, review audit logs and backups.
• Ensure server/workstation security, apply patches and STIGs.
• Install and configure Windows Server OS and services.
• Manage Active Directory, DNS, DHCP and VMware configurations.
• Provide technical support for workstations, servers, and VMs.
• Monitor system health and respond to incidents during the shift.
• Maintain configuration and process documentation.
• Support DIARMF activities and cybersecurity standards.
• Serve as a technical resource for junior admins on shift.

Skills

Clearance

Windows Server

Active Directory

DNS/DHCP

VMware

DIARMF

Patch management

Shift work

Education

B.S. in IT/engineering

Tools

ACAS

HBSS

Tanium

Remedy ITSM

PowerShell

Job description

Job Title: Senior Systems Administrator

Location: Pentagon, Arlington, VA On-Site

Clearance: Active Secret or Top-Secret Clearance

Salary: $100K - $106K

Application Deadline: November 30, 2026

Description

The Senior Systems Administrator is responsible for the operational stability, security and maintenance of server and network systems in the DISA Joint Service Provider Platform Services environment. The position installs and configures operating systems, provides system and network support, manages Active Directory, DNS and DHCP, performs patch management and upgrades, monitors logs, maintains backups, and ensures compliance with DoD Security Technical Implementation Guides. The senior administrator works with limited supervision, leads troubleshooting on the assigned shift, and serves as a technical resource for junior administrators.

Responsibilities

• - Perform day to day maintenance and operations, including review of audit logs, backups, and maintenance of the network equipment inventory.

• - Ensure server and workstation security, apply patches and upgrades, and maintain compliance with DoD STIGs.

• - Install and configure Windows server operating systems and supporting services.

• - Manage and configure Active Directory, DNS, DHCP and VMware virtualization.

• - Provide technical support for network systems, including workstations, servers and virtual terminals.

• - Monitor system health and respond to incidents during the assigned shift; elevate and document per JSP procedures.

• - Maintain system configuration documentation and system process and procedure documentation.

• - Support DoD Information Assurance Risk Management Framework (DIARMF) activities and maintain cybersecurity standards.

• - Serve as a technical resource for junior administrators on the shift.

Required qualifications

• Active Secret or Top-Secret Clearance

• DoD 8140 / 8570 IAT Level II certification (Security+ CE or higher), current and verified before submission.

• Bachelor of Science in Information Technology or an engineering field.

• Minimum 5 years of experience administering Windows server environments.

• Experience managing and configuring Active Directory, DNS, DHCP and VMware.

• Experience applying patches and maintaining DoD STIG compliance across servers and workstations.

• Experience providing technical support for workstations, servers and virtual terminals in an enterprise environment.

• Understanding of the DoD Information Assurance Risk Management Framework (DIARMF).

• Able to work the assigned shift, including nights or weekends if the vacancy is on a non day shift.

Preferred qualifications

• Experience in a DoD or DISA 24 by 7 operations or watch floor environment.

• Experience with ACAS, HBSS or ENS, and Tanium.

• Experience with an enterprise ITSM ticketing system such as Remedy.

• Scripting experience with PowerShell.

About S2i2

S2i2 is a growing company with a supportive and inclusive culture and many opportunities for professional development and growth. We have created a supportive, family-like work environment where contributions are recognized. Regular company updates and open lines of communication with leadership fosters collaboration within the company.

We are proud to include:

• Support to achieve professional certifications and degrees

• Leadership that is accessible to all employees

• Regular company updates

• Client networking social engagements

• Monthly team-building activities (past examples: Top Golf)

• Supporting our community - including veterans

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, disability, age, sexual orientation, gender identity, national origin, veteran status, or genetic information.