Senior System Administrator – TS/SCI Poly; On-Call
Listed on 2026-11-05
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IT/Tech
Systems Administrator, Cybersecurity, IT Support
Cornerstone Defense is seeking a System Administrator in Herndon, VA with Active TS/SCI with Polygraph to support a small group of end users and multiple systems. The role requires strong system administration skills across Linux/Unix and Windows platforms, excellent communication with customers, and flexibility to work day, night, weekend, and holiday shifts.
The position emphasizes maintaining documentation, monitoring performance, and contributing to performance optimizations.
This opportunity is for the Senior System Administrator – TS/SCI with Poly (On-Call) role at Cornerstone Defense LLC.
This role, Senior System Administrator – TS/SCI with Poly (On-Call) at Cornerstone Defense LLC, could be your next career step.
Are you ready to take on the Senior System Administrator – TS/SCI with Poly (On-Call) role at Cornerstone Defense LLC?
We would love to welcome a new Senior System Administrator – TS/SCI with Poly (On-Call) to our group in Herndon, VA, United States.
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