Senior System Administrator

General information

Requisition # R66280 Locations USA-VA-Chantilly Posting Date 02/23/2026 Security Clearance Required Top Secret Remote Type Onsite Time Type Full time

Description & Requirements

Shape the future of defense with MANTECH! Join a team dedicated to safeguarding our nation through advanced tech and innovative solutions. Since 1968, we’ve been a trusted partner to the Department of Defense, delivering cutting-edge projects that make a real impact. Dive into exciting opportunities in Cybersecurity, IT, Data Analytics and more. Propel your career forward and be part of something extraordinary. Your journey starts now—protect and innovate with MANTECH!

MANTECH seeks a motivated, career and customer-oriented Senior Systems Administrator to join our team in Chantilly, VA.  This is a full-time onsite position.

Responsibilities include, but are not limited to:

• Providing Tier II IT Systems support on a wide range of technologies, including: VMware vCenter, Horizon View, Site Recovery Manager, SolarWinds, Cisco Catalyst Center (DNAC), GEMOne, HP SANs, Certificate Services, DHCP, DNS, Active Directory, Group Policies and Microsoft Windows Operating Systems 

• Diagnosing and resolving the performance, security, and/or technical challenges related to the platforms listed above

• Writing Standard Operating Procedures (SOPs) to accomplish repetitive tasks

• Participating in processes throughout all phases of the ITIL Service Lifecycle, including submitting Change Requests 

• Performing requirements analysis, requirements gathering, and integration for all platforms listed above

• Providing direction and guidance to less-experienced Systems Engineers 

• Investigating and resolving operational problems in conjunction with other engineering and technical personnel

• Working on project teams responsible for engineering and packaging releases to integrate within the customer’s production IT environment

• Willingness to occasionally work after normal duty hours (nights and weekends) to support system maintenance or service outages

Minimum Qualifications:

• Bachelor’s degree and 5+ years of IT experience 

• DoD 8570 IAT Level II/8140 level Intermediate Certification required, ex., Security+, SecurityX 

• DoD 8570 computing environment certification required within 6 months of hire ex., MCSA, VCP, or equivalent

• Experience with Microsoft Windows 2008/2012/2016/2019 Servers; Microsoft Windows 10; administering Microsoft Exchange, Active Directory, and workstation and server hardware; administering Microsoft Office 2010/2016; administering DNS, Group Policy, and PKI; administering vSphere, Horizon View, data backup, and antivirus software; basic networking including DHCP/TCPIP

• CISCO networking devices

• TACLANE encryption devices

• Knowledge of Microsoft Windows Systems, VMWare, and CISCO systems