Senior Systems Administrator

General information

Requisition # R66450 Locations USA-VA-Chantilly Posting Date 03/16/2026 Security Clearance Required TS/SCI 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, customer-oriented Senior Systems Administrator to join our team in Chantilly, VA.  This is an onsite position.

Responsibilities include but are not limited to:

• Maintain/troubleshoot Windows servers, workstations and peripherals

• Perform Windows system administrative support to include account management, installing software and monitoring systems

• Maintain domain controllers, file and application servers

• Properly receive and triage customer incidents in the ticketing system

• Follow standard operating procedures to accurately log all tickets within the ticketing system

• Perform remote troubleshooting through diagnostic techniques

• Properly escalate unresolved tickets to the next tier of support

• Engage with customers throughout the process and follow up to ensure proper incident closure

• Ensure quality and productivity standards are maintained while meeting customer timelines

• Work schedule is 2nd shift with occasional weekends as needed

Minimum Qualifications:

• Bachelor's Degree in Information Technology, Cybersecurity, Data Science, Information Systems, or Computer Science, from an ABET accredited or CAE designated institution with 4+ years experience or 8+ years of experience as a System Administrator or in a similar role.

• DoD 8570 IAT Level II certification, ex., Security+

• Experience with network troubleshooting

• Knowledge of system security, data backup/recovery, and network monitoring

Preferred Qualifications:

• DoD 8140-451 Intermediate Certification (Cloud+ or GICSP or SSCP or GSEC)

• ITIL 4 Foundations certification

• Azure Certification

Security Clearance Requirements:

• Must have a current/active Top Secret-SCI clearance adjudicated within the last 6 years and be willing and able to obtain a polygraph.

Physical Requirements:

• The person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or