Junior Systems Administrator

Remote from: USA
Salary, yearly, USD: 59,100 - 98,000
Department: DevOps & Infrastructure
Employment type: Full Time,
Job posted: 21 May 2026
Apply before: 21 Jun 2026
Experience level: Entry-Level
Junior
Views / Applies: 24 / 3

ManTech delivers technology-driven innovation, develops game-changing solutions, and delivers mission-focused technologies for defense and federal civilian agencies.

Defense & Space
1968

Actively Hiring

AI Summary

This Junior Systems Administrator position with MANTECH supports the CASTLE-NET Program for the U.S. Army Corps of Engineers. The role involves managing IT infrastructure including Windows, Linux, and VMware environments, with responsibilities in installation, configuration, maintenance, and security. It is a fully remote position requiring a Secret security clearance and IAT Level II certification. The job is suited for entry-level candidates with a bachelor's degree or equivalent experience, offering a chance to work on defense-related projects. MANTECH emphasizes innovation and customer-focused IT support.

Job Complexity

Easy Hard

AI Insight This is a junior-level role requiring 0+ years of experience, making it accessible for entry-level candidates. The technical requirements are foundational, and the security clearance is a standard requirement for defense contractors.

Salary Analysis

AI Insight The offered salary range of $59,100-$98,000 is competitive for a junior systems administrator role, with a median of $78,550. The market range for similar positions in the US is $55,000-$90,000, placing this offer slightly above average, particularly considering the remote work option and defense sector benefits.

Key Skills

Windows Server Linux Administration VMware vSphere PowerShell Bash Python Patch Management Security+ ITIL Remote Support

Cover Letter Sample

Dear Hiring Manager,

I am writing to express my strong interest in the Junior Systems Administrator position at MANTECH. With a Bachelor's degree in Information Technology and foundational experience in Windows, Linux, and VMware environments, I am eager to contribute to the CASTLE-NET Program and support the U.S. Army Corps of Engineers' IT needs. My hands-on experience with scripting languages like PowerShell and Bash, along with a commitment to maintaining security and performance, aligns well with the responsibilities outlined.

I hold a Security+ certification (IAT Level II) and am prepared to obtain a Secret clearance. I am drawn to MANTECH's mission of safeguarding the nation through innovative technology and am excited about the opportunity to work remotely while delivering world-class IT support. Thank you for considering my application; I look forward to discussing how I can add value to your team.

Sincerely,
[Your Name]

Possible Interview Questions

Describe your experience with Windows Server and Linux administration. What are the key differences you've encountered?

I have experience managing Windows Server environments including Active Directory, Group Policy, and DNS. For Linux, I've worked with Red Hat and CentOS, focusing on user management, file permissions, and shell scripting. Key differences include the command-line interface focus in Linux versus GUI tools in Windows, and package management (yum/apt vs. MSI).

How do you approach troubleshooting a server performance issue?

I start by checking system resources (CPU, memory, disk I/O) using tools like Task Manager or top. Then I review logs (Event Viewer or syslog) for errors. I identify recent changes and test connectivity. If needed, I use performance monitoring tools to pinpoint bottlenecks and apply fixes like restarting services or adjusting configurations.

Explain your understanding of virtualization technologies, specifically VMware vSphere.

VMware vSphere is a hypervisor that allows multiple virtual machines to run on a single physical host. I understand how to create and manage VMs, configure resource allocation (CPU, memory), and use features like vMotion for live migration. I also know about snapshot management and high availability clusters.

Can you walk us through a time you automated a repetitive task using a scripting language?

In a previous internship, I used PowerShell to automate user account creation in Active Directory. The script imported a CSV file, created user objects, set initial passwords, and added users to security groups. This reduced manual effort by 80% and minimized errors.

What security measures do you consider important when administering systems?

I prioritize regular patch management, enforcing strong password policies, and disabling unnecessary services. I also use firewalls, implement least privilege access, and monitor logs for suspicious activity. Compliance with standards like NIST and maintaining IAT Level II certification ensures I stay updated on security best practices.

General information

Requisition # R67752 Locations USA-Remote Work Posting Date 05/19/2026 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 Junior 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:

Contribute to the management and maintenance of the IT infrastructure, ensuring reliability, performance, and security across various systems including Windows, Linux, and VMware environments.
Involves the installation, configuration, maintenance, and support of servers and virtualized environments, working closely with IT teams, application developers, and stakeholders to develop configurations, troubleshoot issues, and ensure compliance with organizational policies and best practices.
Ensuring system security, performance, and availability, as well as maintaining comprehensive documentation of system configurations and procedures.
Deliver world-class IT services and responsive, dependable customer support.
Exceed the expectations of U.S. Army Corps of Engineers (USACE) OCIO/G-6 IT end-users.
Deliver vital solutions and strengthen the IT foundation with secure, innovative, and modernized technological solutions.

Minimum Qualifications:

Requires a Bachelor’s degree (or equivalent work experience) in Information Technology, Computer Science, or a related field. In lieu of Bachelor’s degree, Associate degree +2 years relevant experience, or 4 years relevant experience is acceptable.
0+ years of experience position in systems administration for Windows, Linux, or VMware environments.
Possesses basic knowledge of relevant operating systems (e.g., Windows Server, Red Hat, CentOS) and virtualization technologies (e.g., VMware vSphere, ESXi).
Understanding of scripting languages (e.g., PowerShell, Bash, Python) and knowledge with system monitoring, patch management, and performance tuning.
Maintain relevant certifications (e.g., Microsoft Certified: Windows Server, RHCSA, RHCE, VMware Certified Professional – VCP).
Must maintain a 8140 IAT Lvl II certification.

Preferred Qualifications:

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

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 with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations.

The projected compensation range for this position is $59,100.00-$98,000.00. 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.

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