Senior Systems Administrator

General information

Requisition # R67494 Locations USA-Remote Work Posting Date 04/30/2026 Security Clearance Required Secret Remote Type Fully Remote 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!

***This is for a future opportunity***

MANTECH seeks a motivated, career and customer-oriented Senior Systems Administrator to join our CASTLE-NET Program team.  This is a remote position.    

Be a part of an agile team to provide innovative, customer focused, and cost-effective integrated enterprise IT support services in support of the client’s vision of engineering solutions for the Nation’s toughest challenges.  

Responsibilities include but are not limited to:

• Managing and maintaining the IT infrastructure to ensure reliability, performance, and security across Windows, Linux, and VMware environments.

• Planning and leading major technology assignments while providing leadership to ensure technical requirements and project objectives are met.

• Installing, configuring, and supporting servers and virtualized environments in close coordination with IT teams, application developers, and stakeholders.

• Evaluating performance results and recommending major changes that affect short-term project growth and overall success.

• Interfacing with senior management regarding decision-making and domain knowledge that may have a critical impact on project implementation.

• Delivering world-class IT services and responsive customer support to exceed the expectations of USACE OCIO/G-6 IT end-users.

• Functioning as a technical expert across multiple project assignments to deliver secure, innovative, and modernized technological solutions.

Minimum Qualifications:

• Bachelor’s degree in Information Technology or related field; or an Associate degree with 10+ years of experience; or 12+ years of relevant experience.

• Requires 8+ years of progressively responsible experience in systems administration for Windows, Linux, or VMware environments.

• Comprehensive knowledge of operating systems such as Windows Server, Red Hat, and CentOS, as well as virtualization technologies like VMware vSphere.

• Proficiency in scripting languages including PowerShell, Bash, or Python, and experience with system monitoring and performance tuning.

• Experience creating, maintaining, and communicating complex information technology documentation and system configurations.

• Possess