Senior Systems Administrator

**MANTECH** seeks a motivated and skilled **Senior Systems Administrator** to join our sustainment team in **Chantilly, VA.** In this role, you will support a mission-critical enterprise environment by ensuring the continued health, performance, and compliance of complex network and system infrastructures. You will help drive key Operations and Maintenance (O&M) activities while leveraging strong technical expertise and collaborative problem-solving to maintain optimal system functionality.

**Responsibilities include, but are not limited to:**

+ Provide hands-on O&M support for enterprise systems, including break-fix resolution and routine sustainment tasks
+ Monitor system performance, health, and availability using enterprise tools such as ServiceNow and JIRA
+ Collaborate with engineering and Assessment & Authorization (A&A) teams to apply patches, perform upgrades, and ensure RMF compliance
+ Support Identity and Access Management (IdAM) initiatives,...