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# Senior Systems Administrator-TS

- **Company:** TEKSYSTEMS INC.
- **Location:** Dallas, TX, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Active Directory, Cyber Security, Linux System Administration, Linux Servers, System Center Configuration Manager, Windows Servers, Vmware
- **Published:** October 12, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9235805/senior-systems-administrator-ts

## About the Role

We are seeking an experienced Senior Systems Administrator to support enterprise IT infrastructure within a highly secure and mission-critical environment. This role is ideal for a seasoned professional with strong Windows and Linux administration experience, a cybersecurity-focused mindset, and the ability to provide both hands-on technical support and technical leadership., * Expert-level Windows and Linux systems administration experience.

 * Experience with MECM/SCCM, VMware, Active Directory, and Windows Server.
 * Strong enterprise infrastructure and endpoint management experience.
 * Security+ or equivalent IAT Level II certification required.
 * Experience in government, defense, or regulated environments.
 * Active Top Secret Clearance required.
Preferred Experience

 * CISSP or advanced security certifications.
 * RMF and DFARS compliance experience.
 * Enterprise virtualization and infrastructure management.
 * Technical leadership and mentoring experience.

## Description

* Administer and support enterprise Windows and Linux server environments.
 * Manage MECM, VMware, Active Directory, and Windows Server environments.
 * Perform advanced troubleshooting and resolve complex infrastructure issues.
 * Support RMF and DFARS compliance requirements.
 * Provide technical leadership and mentorship to junior team members.
 * Collaborate with cross-functional teams to improve system stability, performance, and security.