**Description**

Leidos is committed to delivering innovative solutions and supporting mission-critical operations for our customers. The DISA CESO ITSS team provides network operations and cyber defense support to the Defense Information Systems Agency (DISA), enabling secure and reliable communications for the Department of Defense (DoD) and Combatant Commands (COCOMs).

Leidos is seeking a **Senior Windows Systems Administrator (SA)** to serve as the primary Windows SA and **subject matter expert (SME)** for our team. This role focuses on ownership of our Windows environment while supporting a mixed‑OS infrastructure.

**Primary Responsibilities**

+ Serve as the senior lead and primary Subject Matter Expert (SME) for all Windows Server environments, driving technical strategy, architecture decisions, and operational excellence.
+ Design, architect, implement, and sustain enterprise Windows infrastructure.
+ Own the health, performance, and ...