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

To apply, please visit https://s2i2.com/careers/

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; escalate 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:
• 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.
• 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