Senior Systems Administrator

General information

Requisition # R67726 Locations USA-Remote Work Posting Date 05/13/2026 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!

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.
• Possession and maintenance of relevant certifications such as Microsoft Certified: Windows Server, RHCSA, RHCE, or VCP.
• Must maintain a DoD 8140 IAT Level II certification to comply with mission security and baseline requirements.

Preferred Qualifications:

• Familiarity with the USACE IT environment, regulatory requirements, and data security best practices.

Clearance Requirements:

• Must possess a Secret security clearance prior to starting this position.

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

The projected compensation range for this position is $137,100.00-$244,100.00. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories. In addition, MANTECH invests in its employees beyond just compensation. MANTECH’s benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections. MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation. If you need a reasonable accommodation to apply for a position with MANTECH, please email us at [email protected] and provide your name and contact information.