5,087 Systems Administrator jobs in the United States

Press Tab to Move to Skip to Content Link Search by Keyword (use Keyword for Remote Positions) Select how often (in days) to receive an alert: Systems Administrator (Systems Administrator 3) - 23738 Requisition Number:23738 Required Travel: 0 - 10% Employment Type:Full Time/Salaried/Exempt Anticipated Salary Range:$76,513.00-$105,000.00 Security Clearance:Secret Level of Experience:Senior This opportunity resides with Global Security (GS). Mission Technologies’ Global Security (GS) group comprises live, virtual, constructive (LVC) solutions; fleet sustainment; nuclear and environmental; and Australia business. As a trusted partner to our military customers, HII designs, develops and operates the largest LVC enterprise that prepares warfighters for cross-domain battle. With advanced technologies to enable mission readiness, HII understands that preparation requires full coordination—not readiness in piece-parts. For more than 40 years, the U.S. Navy has entrusted HII to maintain and modernize the vast majority of its fleet. With a holistic approach to life-cycle maritime defense systems—from small watercraft to submarines, surface combatants and aircraft carriers—HII ensures a high state of readiness. HII supports the Department of Energy’s national security mission through the management and operation of its sites, as well as the safe cleanup of legacy waste across the country. HII meets clients’ toughest nuclear and environmental challenges. Meet HII’s Mission Technologies Division Our team of more than 7,000 professionals worldwide delivers all-domain expertise and advanced technologies in service of mission partners across the globe. Mission Technologies is leading the next evolution of national defense – the data evolution - by accelerating a breadth of national security solutions for government and commercial customers. Our capabilities range from C5ISR, AI and Big Data, cyber operations and synthetic training environments to fleet sustainment, environmental remediation and the largest family of unmanned underwater vehicles in every class. Find the role that’s right for you. Apply today. We look forward to meeting you. HII-Mission Technologies Division is seeking a Systems Administrator to join our Data Engineering Team in support of the Department of Defense (DoD). This role is ideal for an experienced system administrator who wants to expand skills in cloud engineering, with a focus on supporting data engineering workflows. This person will work regular U.S. Eastern business hours remotely from anywhere in the U.S. • Monitor system performance and ensure high availability and security—ensure Business Intelligence solution, virtual workspaces (VDI and Azure Virtual Desktop), and other mission-critical systems and applications are operational during business hours. • Identify issues related to software or systems, troubleshoot, and provide solutions to ensure seamless operation for the team. • Install, configure, and maintain operating systems (Windows, Linux)—apply patches/updates and implement security controls. • Coordinate data acquisition via SFTP or API calls from remote systems, and maintain working relationships with data source staff. • Provide technical support to internal users. • Document system configurations and operating procedures. • Support and administer ETL processes moving acquired data into a data warehouse. • Administer and maintain Tableau Server and Salesforce, ensuring optimal performance and functionality. • Perform environment audit and configuration scripting (e.g., PowerShell for tasks such as gathering software inventories across all systems). Minimum Qualifications • 6 years relevant experience with Bachelors in related field; 4 years relevant experience with Masters in related field; or High School Diploma or equivalent and 10 years relevant experience. • 6 years of IT experience and a completed Bachelor’s degree in Information Systems/Technology, Mathematics, Operations Research, Statistics, or Engineering. • Proven experience as a System Administrator—3+ years work experience installing, configuring, and managing Microsoft Windows Server. • Proven capacity to be productive and self-initiated while working remotely from the rest of the team. • Excellent problem-solving and communication skills. • Must possess and maintain an active Secret Security Clearance. • Active CompTIA Security+ certification. • Microsoft Windows Server certified (e.g., Windows Server Hybrid Administrator Associate or MCSE: Windows Server Admin). • Must be able to complete the Azure Administrator certification within 3 weeks of hire. • Must be able to complete the Salesforce Administrator certification within 6 weeks of hire. Preferred Requirements • Working knowledge of scripting in PowerShell. • Linux administration experience. • Experience with cloud platforms (Azure and/or AWS) and managing environments within them. • Proficiency in implementing security controls (such as STIG) and remediating vulnerabilities. • Experience with T-SQL queries. • Experience with managing Tableau Server. • Experience supporting VDI and Azure Virtual Desktop environments. • Experience using Git. Physical Requirements Adequate visual acuity and manual dexterity for meeting the requirements of the Systems Analyst discipline. HII is more than a job - it’s an opportunity to build a new future. We offer competitive benefits such as best-in-class medical, dental and vision plan choices; wellness resources; employee assistance programs; Savings Plan Options (401(k)); financial planning tools, life insurance; employee discounts; paid holidays and paid time off; tuition reimbursement; as well as early childhood and post-secondary education scholarships. Bonus/other non-recurrent compensation is occasionally offered for qualified positions, and if applicable to this role will be addressed by the recruiter at the screening phase of application. The listed salary range for this role is intended as a good faith estimate based on the role's location, expectations, and responsibilities. When extending an offer, HII's Mission Technologies division takes a variety of factors into consideration which include, but are not limited to, the role's function and a candidate's education or training, work experience, and key skills. Why HII We build the world’s most powerful, survivable naval ships and defense technology solutions that safeguard our seas, sky, land, space and cyber. Our workforce includes skilled tradespeople; artificial intelligence, machine learning (AI/ML) experts; engineers; technologists; scientists; logistics experts; and business administration professionals. Recognized as one of America’s top large company employers, we are a values and ethics driven organization that puts people’s safety and well-being first. Regardless of your role or where you serve, at HII, you’ll find a supportive and welcoming environment, competitive benefits, and valuable educational and training programs for continual career growth at every stage of your career. Together we are working to ensure a future where everyone can be free and thrive. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, physical or mental disability, age, or veteran status or any other basis protected by federal, state, or local law. Do You Need Assistance? If you need a reasonable accommodation for any part of the employment process, please send an e-mail to and let us know the nature of your request and your contact information. Reasonable accommodations are considered on a case-by-case basis. Please note that only those inquiries concerning a request for reasonable accommodation will be responded to from this email address. Additionally, you may also call 1- for assistance. Press #3 for HII Mission Technologies. #J-18808-Ljbffr

We are seeking a motivated and detail-oriented Entry-Level Systems Administrator to join our IT and Infrastructure team. In this role, you’ll assist in maintaining and monitoring the organization’s IT systems, cloud services, and internal tools. You’ll gain hands-on experience while ensuring a stable, secure, and efficient digital environment for both remote and internal teams.

Key Responsibilities:

Assist in the setup, configuration, and maintenance of user accounts, workstations, and servers

Monitor system performance and troubleshoot basic hardware, software, and connectivity issues

Support internal staff with IT tickets, password resets, access requests, and application support

Help manage cloud-based environments (e.g., Google Workspace, Azure, AWS)

Maintain accurate documentation of system configurations and procedures

Monitor system alerts and escalate issues to senior IT staff as needed

Ensure security protocols and best practices are followed, including updates and patching

Qualifications:

Associate’s or Bachelor’s degree in Information Technology, Computer Science, or a related field

Familiarity with Windows, macOS, and/or Linux operating systems

Basic understanding of networking, cloud platforms, and system administration tasks

Strong problem-solving skills and attention to detail

Excellent communication skills and a team-oriented mindset

Ability to work independently and manage multiple tasks

Willingness to learn new systems and technologies

Preferred (Not Required):

IT certifications such as CompTIA A+, Network+, or Microsoft Certified: Azure Fundamentals

Experience with Google Workspace, Office 365, or remote desktop management tools

Familiarity with ticketing systems (e.g., Jira, Zendesk, Freshservice)

What Pleio Offers:

A mission-driven culture focused on improving lives

Mentorship and real-world IT experience in a supportive team environment

Career development and training opportunities

Competitive compensation and remote work flexibility

Exposure to modern cloud-based infrastructure and healthcare IT systems

Administrative tasks, Updating client information in computer system, Running and processing multiple documents utilizing Microsoft Word, Excel, and Access, Inputting purchase orders, Other various administrative tasks, Inputs information from a variety of sources into a computer database. May take customer orders and enter them into a pre-established tracking system, Assignments will be sent to you via e-mail or IM and you will report directly to your immediate supervisor.Can you handle that if trained towards it.

This is strictly an online and work from home job the working hours are flexible and you can choose to work from home or anywhere of your choice.

JOB REQUIREMENTS:

These are the requirements for the Job.
-Must be authorized to work in the U.S
-Must be fluent in communication and English
-Must have a clear criminal charge
-Must be 18+ average.

Remember, Assignments will be sent to you via e-mail or IM and you will report directly to your immediate supervisor.Can you handle that if trained towards it.

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

Responsibilities include but are not limited to:

• Provide Tier 3 technical remote and onsite support and guidance to NCTE Range end-users, addressing IT-related issues and inquiries in a timely and professional manner

• Diagnose and resolve complex technical issues related to system configurations and network connectivity for Range POR systems

• Ensure compliance with security policies, procedures, and best practices, with a focus on maintaining a secure IT environment

• Strong understanding of Group Policy Management and Active Directory in Windows environments

• Experience writing standard operating procedures (SOPs) for IT systems and processes

• Excellent troubleshooting skills and the ability to diagnose and resolve complex technical issues effectively

• Up to 25% travel can be expected

Minimum Qualifications:

• High School Diploma and a minimum of  3 years of relevant experience

• Experience in system administration, with proficiency in both Linux and Windows environments

• Must have CompTIA Security+ CE and

• Must have VMware, Windows, or Linux Operating System (OS) certification

Preferred Qualifications:

• Bachelor's degree in Computer Science, Information Technology, or related field

Clearance Requirements:

• Active Secret security clearance with the ability to obtain a Top Secret

Physical Requirements:

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

• Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer.

• The person in this position needs to occasionally move about inside the office to access file cabinets, office machinery, etc.

MANTECH seeks a motivated, career and customer-oriented Systems Administrator  to join our team onsite in San Diego, California. This is an onsite position.

Responsibilities include but are not limited to:

• Provide Tier 3 technical remote and onsite support and guidance to NCTE Range end-users, addressing IT-related issues and inquiries in a timely and professional manner

• Diagnose and resolve complex technical issues related to system configurations and network connectivity for Range POR systems

• Ensure compliance with security policies, procedures, and best practices, with a focus on maintaining a secure IT environment

• Strong understanding of Group Policy Management and Active Directory in Windows environments

• Writing standard operating procedures (SOPs) for IT systems and processes.

• Excellent troubleshooting skills and the ability to diagnose and resolve complex technical issues effectively

• Up to 25% travel can be expected

Minimum Qualifications:

• High School Diploma and 5+ years of relevant IT systems experience

• Experience in system administration, with proficiency in both Linux and Windows environments

• Must have CompTIA Security+ CE

• Must have a VMware, Windows, or Linux Operating System (OS) certification

Preferred Qualifications:

• Bachelor's degree in Computer Science, Information Technology, or related field

Clearance Requirements:

• US Citizenship required and an active Secret security clearance with the ability to obtain a Top Secret

Physical Requirements:

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

• Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer

• The person in this position needs to occasionally move about inside the office to access file cabinets, office machinery, etc.

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

Responsibilities include but are not limited to:

• Provide Tier 3 technical remote and onsite support and guidance to NCTE Range end-users, addressing IT-related issues and inquiries in a timely and professional manner

• Diagnose and resolve complex technical issues related to system configurations and network connectivity for Range POR systems

• Ensure compliance with security policies, procedures, and best practices, with a focus on maintaining a secure IT environment

• Strong understanding of Group Policy Management and Active Directory in Windows environments

• Experience writing standard operating procedures (SOPs) for IT systems and processes

• Excellent troubleshooting skills and the ability to diagnose and resolve complex technical issues effectively

• Up to 25% travel can be expected

Minimum Qualifications:

• High School Diploma and a minimum of  3 years of relevant experience

• Experience in system administration, with proficiency in both Linux and Windows environments

• Must have CompTIA Security+ CE and

• Must have VMware, Windows, or Linux Operating System (OS) certification

Preferred Qualifications:

• Bachelor's degree in Computer Science, Information Technology, or related field

Clearance Requirements:

• Active Secret security clearance with the ability to obtain a Top Secret

Physical Requirements:

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

• Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer.

• The person in this position needs to occasionally move about inside the office to access file cabinets, office machinery, etc.

MANTECH seeks a motivated, career and customer-oriented Systems Administrator  to join our team onsite in San Diego, California. This is an onsite position.

Responsibilities include but are not limited to:

• Provide Tier 3 technical remote and onsite support and guidance to NCTE Range end-users, addressing IT-related issues and inquiries in a timely and professional manner

• Diagnose and resolve complex technical issues related to system configurations and network connectivity for Range POR systems

• Ensure compliance with security policies, procedures, and best practices, with a focus on maintaining a secure IT environment

• Strong understanding of Group Policy Management and Active Directory in Windows environments

• Writing standard operating procedures (SOPs) for IT systems and processes.

• Excellent troubleshooting skills and the ability to diagnose and resolve complex technical issues effectively

• Up to 25% travel can be expected

Minimum Qualifications:

• High School Diploma and 5+ years of relevant IT systems experience

• Experience in system administration, with proficiency in both Linux and Windows environments

• Must have CompTIA Security+ CE

• Must have a VMware, Windows, or Linux Operating System (OS) certification

Preferred Qualifications:

• Bachelor's degree in Computer Science, Information Technology, or related field

Clearance Requirements:

• US Citizenship required and an active Secret security clearance with the ability to obtain a Top Secret

Physical Requirements:

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

• Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer

• The person in this position needs to occasionally move about inside the office to access file cabinets, office machinery, etc.

ManTech is seeking a motivated, career and customer-oriented System Administrator to join our team in San Antonio, TX .  The team delivers enterprise infrastructure capabilities for a global workforce performing a wide range of missions in defense of our Nation. This effort is the contract vehicle for the Enterprise Infrastructure Services organization overseeing MPO’s Enterprise Information Technology (EIT). EIT is MPO’s backbone- platform for all Enterprise users. Data Center & Compute Services is the EIS enabling organization working with customers, Integrated Product Teams (IPT), and vendors to deliver select EIT.

Responsibilities Included but are not limited to:

• Design, deploy and administer virtualized platforms, using VMWare.
• Configure and manage Linux and Solaris operating systems.
• Analyze and resolve complex problems associated with server hardware, applications, and software integration.
• Troubleshoot, maintain integrity of and configure network components, along with implementation of operating systems enhancements to improve reliability and performance.

 Minimum Qualifications:

• Five (5) years or more experience as a Systems Administrator supporting the Intelligence Community in enterprise infrastructure-related programs.
• Bachelor’s degree in a technical field. Five years of additional relevant experience may be substituted for a bachelor’s degree.

 Preferred Qualifications:

• Ten(10) years or more experience as a Linux Systems Administrator.
• Experience in implementing solutions with PKI-controlled access is desired.
• Understanding networking components is desired.

• Experience with Infrastructure as Code (IaC) languages (Terraform or BICEP)

Clearance Requirements:

• Must have a current/active TS/SCI w/ Polygraph.   

Physical Requirements:  

• The person in this position must be able to remain in a stationary position 50% of the time.
• Must communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations.

ManTech seeks an experienced and passionate, career and customer-oriented System Administrator to join our team located in the San Antonio, TX area.

Responsibilities include, but are not limited to:

• Demonstrate experience creating and managing virtual environments (VMWare ESX, VCenter Administration) 
• Experience in administration of Linux
• Experience configuring and maintaining storage and file systems (NFS, EXT3/4, XFS) 
• Experience in developing and delivering briefings, technical presentations, and program documentation to senior program management 

Minimum Qualifications:

• Bachelor’s degree in computer science or a related discipline and 7 years related experience or associate’s degree in computer science or a related discipline and 11 years related experience
• Experience using Ansible
• Experience writing scripting languages (Bash, Shell, Python, Perl) 
• Proficiency in working with applicable network devices to include routers and switches, gateways and hubs 
• Experience with computer networking protocols including, but not limited to TCP, IP, UDP, HTTP, DHCP, and DNS   
• Experience working with a team to introduce and integrate new technologies into existing production environments 
• Experience with integrated processing environments such as a Storage Area Network  

Preferred Qualifications:

• Experience with DevOps tools such as Docker, Kubernetes, SALT, Puppet
• Experience with cross-domain solutions or NiFi desirable for some positions 
• Experience with computer operating systems

Clearance Requirement:

• Must have a current/active TS/SCI with Poly

Physical Requirements:

• Must be able to remain in a stationary position at least 50% of the time.
• Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.
• Constantly operate a computer and other office productivity machinery, such as, the copy machine/fax machine/computer/printer.