Senior Systems Administrator

General information

Requisition # R66293 Locations USA-NV-Fallon 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 Fallon, NV. This is an onsite position.

Responsibilities include but are not limited to:

• Implementing and maintaining secure configurations for operating systems and network devices in accordance with Defense Information Systems Agency (DISA) approved Security Technical Implementation Guides (STIGs)

• Administering and supporting boundary protection devices, including managed switches, proxy servers, routers, firewalls, cryptographic devices, and intrusion detection systems

• Conducting vulnerability assessments using Assured Compliance Assessment Solution (ACAS) to identify, document, and remediate security findings

• Utilizing DISA STIGs and the Security Content Automation Protocol (SCAP) Compliance Checker to validate system compliance and enforce security baselines

• Incorporating automated benchmarks and security controls within DoD Host-Based Security Systems (HBSS) to strengthen endpoint protection

• Analyzing assessment results and collaborating with stakeholders to prioritize and implement corrective actions that enhance overall network security posture

Minimum Qualifications: 

• B.S. Computer Science, Information System Management from an ABET accredited institution or IA/CS technology field with 5+ years of IT / Systems Administration related experience.  In lieu of a degree, 9 years of experience as an IT technician on DoD classified networks is acceptable

• Experience as a Computer/server systems administrator in a Windows environment

• Experience implementing operating systems and network devices security configuration in accordance with Defense Information Systems Agency (DISA) approved Security Technical Implementation Guides

• Demonstrated experience in:  administering boundary devices (i.e. managed switches, proxy servers, routers, firewalls, cryptography, and intrusion detection systems), correcting flaws and implementing technical controls in the hardware or software installed within a network environment, and managing campus-scale (multiple buildings, hundreds of users) server installation

• DoD Information Assurance Vulnerability Management Program (IA VMP) experience

• Possess DoD Ap