Systems Administrator

ManTech; Florida; On-site; USD 90,000 - 130,000; Full time

Job summary

MANTECH is seeking a Systems Administrator in Doral, FL to join a mission-focused IT team. You will install, configure, and maintain enterprise servers and virtualization stacks, manage AD and policies, and support security baselines across networks.

The role requires DoD-related experience, strong documentation, and collaboration with engineers and leadership to ensure high system availability. A TS/SCI clearance is required for this position.

Qualifications

• High School Diploma or GED with 7+ years in systems administration.
• Or a bachelor’s degree with 3+ years of relevant experience in IT.
• Or an associate’s degree with 5+ years of relevant experience.
• Experience administering Windows and Linux servers, AD, and VMs.
• Hands-on patch management and baseline configuration duties.

Responsibilities

• Install, configure, maintain, and troubleshoot enterprise servers and virtualized infra.
• Manage user accounts, permissions, AD structures, and group policies across networks.
• Perform patching, upgrades, and security diagnostics to ensure baseline compliance.
• Monitor performance, storage, and network services to prevent bottlenecks.
• Collaborate with cross-functional teams and site leadership for high availability.
• Maintain configuration records, technical docs, and inventories.
• Recommend process improvements to enhance IT administration and efficiency.

Skills

Windows Server administration

Linux server administration

Active Directory

Virtualized infrastructure

Patch management

Baseline configuration management

Documentation

Troubleshooting hardware/software

Security clearance knowledge

Education

High School Diploma or GED

Bachelor’s degree in Computer Science or Information Technology

Associate’s degree

Job description

MANTECH seeks a motivated, career and customer-oriented Systems Administrator to join our team in Doral, FL .

Responsibilities include but are not limited to:

• Installing, configuring, maintaining, and troubleshooting enterprise server hardware, operating systems, and virtualized infrastructure.

• Managing user accounts, system permissions, active directory structures, and group policies across mission networks.

• Performing routine system maintenance, vulnerability patching, software upgrades, and diagnostic evaluations to ensure baseline security compliance.

• Monitoring system performance, storage availability, and network services to proactively identify and resolve operational bottlenecks.

• Collaborating with cross-functional technical teams, network engineers, and site leadership to maintain high system availability.

• Maintaining accurate configuration management records, technical system documentation, and operational baseline inventories.

• Recommending and implementing continuous process improvements to streamline IT administration and enterprise system efficiency.

Minimum Qualifications:

• High School Diploma or GED with 7+ years of progressively responsible experience in systems administration.

• OR a bachelor’s degree in Computer Science, Information Technology, or a related field with 3+ years of relevant experience

• OR an associate’s degree with 5+ years of relevant experience

• Proven experience administering Windows and Linux server operating systems, Active Directory, and virtualized enterprise environments.

• Hands-on experience with system patch management, baseline configuration management, and server hardware maintenance.

• Proficiency in troubleshooting hardware, software, network services, and system access issues.

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

Preferred Qualifications:

• Relevant professional certifications such as CompTIA Security+, Microsoft Certified: Windows Server Hybrid Administrator Associate, or VMware Certified Professional (VCP).

• Direct experience supporting U.S. Military Command operations, Joint Task Force environments, or OCONUS Department of Defense deployments.

• Familiarity with DoD STIG implementation, vulnerability scanning tools, and secure baseline auditing procedures.

• Demonstrated ability to collaborate effectively across multi-disciplinary teams in dynamic, fast-paced operational settings.

Clearance Requirements:

• Must hold a current/active TS/SCI security clearance.

Physical Requirements:

• Must be able to remain in a stationary position 50%.

• Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.

• Frequently communicates with co-workers, management, and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations.

MANTECH International Corporation 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 [e-mail] and provide your name and contact information.