Senior System Administrator

General information

Requisition # R61354 Locations USA-VA-Virginia Beach Posting Date 06/27/2025 Security Clearance Required 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 System Administrator to join our team in Virginia Beach, VA. This position is onsite.

In this role, the Senior Systems Administrator will support a secure Windows-based Information System and will assist and support the installation, operation, and maintenance of all current and future Information Systems within ManTech.

Responsibilities include, but are not limited to:

• Implement and maintain firewalls, VPNs, IDS/IPS, and monitor systems to detect intrusions and enforce IT security protocols

• Provide expert technical support, resolving complex issues and mentoring junior administrators

• Plan and execute system upgrades, manage backups, and ensure infrastructure resilience

• Monitor system performance and capacity, analyze trends, and recommend enhancements

• Develop and maintain clear technical documentation, ensuring alignment with industry standards

• Support project planning and implementation while ensuring compliance with security regulations and best practices

Minimum Qualifications:

• Bachelor's degree in Computer Science, Information Technology or related field

• 5+ years of professional experience working with computer systems, specifically Windows 10 or 11, software applications, network administration, and troubleshooting

• ACAS vulnerability management experience, i.e., using Assured Compliance Assessment Solution (ACAS) for vulnerability scanning and remediation, ensuring compliance with DoD security standards

• Advanced Hardware Optimization experience, specifically diagnosing and optimizing system hardware (e.g., CPU, memory, storage), beyond basic BIOS/UEFI and laptop hardware knowledge

Preferred Qualifications:

• Advanced expertise in developing PowerShell scripts to automate system maintenance tasks (e.g., log analysis, patch deployment), extending beyond basic scripting

• Basic knowledge of implementing Risk Management Framework (RMF) processes, including security control assessments and authorization package development, complementing STIG and patching skills

• Foundational proficiency in configuring