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Core System Administrator Jobs (NOW HIRING)

System One

System Administrator

Jessup, MD · On-site

$150K/yr

System Administrator - TS/SCI w/ Full Scope Polygraph (FSP) Location: Annapolis Junction, MD Work ... core Linux system administration and operational sustainment work. What You'll Do * Monitor ...

System One

System Administrator

Annapolis Junction, MD · On-site

$150K/yr

System Administrator - TS/SCI w/ Full Scope Polygraph (FSP) Location: Annapolis Junction, MD Work ... core Linux system administration and operational sustainment work. What You'll Do * Monitor ...

Entarian

System Administrator

Honolulu, HI · On-site

$65K - $120K/yr

The C2 System Administrator will provide technical expertise, implementation, maintenance ... Understanding of core network protocols (TCP/IP), LANs/WANs, routers, switches, firewalls, and load ...

Entarian

System Administrator

Honolulu, HI · On-site

$65K - $120K/yr

The C2 System Administrator will provide technical expertise, implementation, maintenance ... Understanding of core network protocols (TCP/IP), LANs/WANs, routers, switches, firewalls, and load ...

Entarian

$65K - $120K/yr

The C2 System Administrator will provide technical expertise, implementation, maintenance ... Understanding of core network protocols (TCP/IP), LANs/WANs, routers, switches, firewalls, and load ...

System One

System Administrator

Annapolis Junction, MD · On-site

$150K/yr

System Administrator - TS/SCI w/ Full Scope Polygraph (FSP) Location: Annapolis Junction, MD Work ... core Linux system administration and operational sustainment work. What You'll Do * Monitor ...

System One

System Administrator

Annapolis Junction, MD · On-site

$150K/yr

System Administrator - TS/SCI w/ Polygraph Location: Annapolis Junction, MD Work Model: 100% Onsite ... core Linux system administration and operational sustainment work. What You'll Do * Monitor ...

System One

System Administrator

Annapolis Junction, MD · On-site

$150K/yr

System Administrator - TS/SCI w/ Polygraph Location: Annapolis Junction, MD Work Model: 100% Onsite ... core Linux system administration and operational sustainment work. What You'll Do * Monitor ...

System One

System Administrator

Annapolis Junction, MD · On-site

$150K/yr

System Administrator - TS/SCI w/ Full Scope Polygraph (FSP) Location: Annapolis Junction, MD Work ... core Linux system administration and operational sustainment work. What You'll Do * Monitor ...

System One

System Administrator

Annapolis Junction, MD · On-site

$150K/yr

System Administrator - TS/SCI w/ Full Scope Polygraph (FSP) Location: Annapolis Junction, MD Work ... core Linux system administration and operational sustainment work. What You'll Do * Monitor ...

Entarian

System Administrator

Honolulu, HI · On-site

$65K - $120K/yr

The C2 System Administrator will provide technical expertise, implementation, maintenance ... Understanding of core network protocols (TCP/IP), LANs/WANs, routers, switches, firewalls, and load ...

Foxconn Assembly LLC

System Administrator

San Jose, CA · On-site

We are seeking a skilled and dedicated System Administrator to join our IT team. This role is crucial for maintaining the stability, security, and efficiency of our core IT infrastructure, directly ...

Entarian

System Administrator

Honolulu, HI

$65K - $120K/yr

The C2 System Administrator will provide technical expertise, implementation, maintenance ... Understanding of core network protocols (TCP/IP), LANs/WANs, routers, switches, firewalls, and load ...

Uw

System Administrator

Seattle, WA · On-site

The System Administrator must ensure system stability, data integrity, and structured change ... Configure and support core modules such as ITSM (Incident, Problem, Change), Service Catalog ...

AVUM INC

System Administrator

Malibu, CA · On-site

$100K - $130K/yr

Position Summary Maintains Avum's development environment networks, systems, and applications at the core level. Serves as on-premises system administrator for physical infrastructure and provides ...

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Showing results 21-40

All JobsCore System Administrator Jobs

Core System Administrator information

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$41K

$88.9K

$137.5K

How much do core system administrator jobs pay per year?

As of Sep 10, 2026, the average yearly pay for core system administrator in the United States is $88,927.00, according to ZipRecruiter salary data. Most workers in this role earn between $70,000.00 and $104,000.00 per year, depending on experience, location, and employer.

What is a core system administrator?

Core System Administrators are IT professionals responsible for managing and maintaining the essential computer systems and servers that support an organization’s critical operations. They install, configure, monitor, and troubleshoot core infrastructure such as operating systems, networks, databases, and security protocols. Their role ensures that all foundational systems are secure, reliable, and running efficiently, often involving regular updates, backups, and emergency response to technical issues. Core System Administrators play a key role in minimizing downtime and supporting the technological needs of a business.

What are the key skills and qualifications needed to thrive as a core system administrator?

To thrive as a Core System Administrator, you need strong knowledge of operating systems (Windows, Linux/UNIX), system architecture, and troubleshooting, often supported by a degree in computer science or related certifications like CompTIA Server+ or Microsoft Certified: Windows Server. Familiarity with server management tools, virtualization platforms (e.g., VMware, Hyper-V), and monitoring systems is typically required. Exceptional problem-solving skills, attention to detail, and effective communication help you manage incidents and collaborate with IT teams. These competencies are vital to ensure infrastructure stability, security, and efficient resolution of technical issues.

How does a core system administrator typically collaborate with other IT teams within an organization?

Core System Administrators frequently work alongside network engineers, security analysts, and application support teams to ensure the stability and security of core infrastructure. This collaboration often involves coordinating on system upgrades, troubleshooting incidents that span multiple technical areas, and implementing organization-wide policies. Regular meetings and ticket-based workflows are common, allowing administrators to communicate system changes and requirements, ensuring seamless operations across all IT functions.

What states have the most Core System Administrator jobs?

States with the most job openings for Core System Administrator jobs include:

What are popular job titles related to Core System Administrator jobs?

For Core System Administrator jobs, the most frequently searched job titles are:

Infographic showing various Core System Administrator job openings in the United States as of August 2026, with employment types broken down into 1% As Needed, 84% Full Time, 12% Part Time, and 3% Contract. Highlights an 92% Physical, 2% Hybrid, and 6% Remote job distribution, with an average salary of $88,927 per year, or $42.8 per hour.

System Administrator

Jessup, MD • On-site

System One
Business Consulting Services • 5 - 10K employees
Learn more about System Oneexternal

$150K/yr

Other

Medical, Dental, Vision, Life, Retirement

Re-posted 20 days ago

Job description

System Administrator – TS/SCI w/ Full Scope Polygraph (FSP)

Location: Annapolis Junction, MD 
Work Model: 100% Onsite
Type: Direct Hire (W2)
Compensation: Up to $150,000/year 
Schedule: 40 hours/week
Clearance Required: Active TS/SCI with FSP 

About the Role

We’re hiring System Administrators at multiple experience levels to support mission-critical operations in Linux-based, high-performance environments. This role is ideal for someone who enjoys hands-on troubleshooting, optimizing system performance, and working closely with engineering and operations teams to keep essential infrastructure reliable and available.

This team includes professionals who specialize in platform, network, and storage engineering—but everyone is expected to contribute to core Linux system administration and operational sustainment work.

What You’ll Do
  • Monitor, maintain, and troubleshoot systems and infrastructure supporting mission operations
  • Install, configure, and administer Linux operating systems and applications
  • Manage file systems, networking services, and system resources
  • Troubleshoot operating system and application issues in complex environments
  • Write and maintain Bash scripts to automate administrative tasks
  • Compile, install, configure, and support software applications
  • Support automation and configuration management initiatives
  • Collaborate with engineering/operations teams to resolve issues and improve performance
  • Document configurations, procedures, and troubleshooting steps
  • Participate in upgrades, maintenance windows, and operational support activities
Required Qualifications
  • Active TS/SCI with Polygraph
  • Linux administration experience with one or more of the following:
    • RHEL, CentOS, Rocky Linux, SLES, Ubuntu
  • Experience with:
    • Linux installation/configuration
    • File system administration
    • TCP/IP networking fundamentals
    • OS and application troubleshooting
    • Bash scripting
    • Software compilation and installation
  • Strong analytical troubleshooting skills and ability to work both independently and on a team
Nice to Have (Strongly Preferred)
  • Exposure to or understanding of High-Performance Computing (HPC) environments
  • Experience supporting large-scale enterprise or mission-critical infrastructure
  • Familiarity with high-speed networking such as InfiniBand and/or Slingshot
  • Tools/Platforms:
    • Jira, Confluence, Grafana, Prometheus, Nagios, Slurm, Git, Salt, Ansible
Storage / Networking Experience (A Plus)

If you have a background in storage, networking, or infrastructure engineering, you’re highly encouraged to apply.

Storage technologies (preferred):

  • Lustre configuration/administration/troubleshooting
  • DDN Exascaler appliances
  • Storage fabric design/support
  • Storage performance tuning/optimization

Networking technologies (preferred):

  • Enterprise routing/switching (Cisco / Juniper / Arista)

Bonus (emerging tech exposure):

  • E1000 Storage Systems, ESNs, DAOS, Weka

Benchmarking/diagnostics tools:

  • IOR, iperf, FIO, lnet_selftest

System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.

#M-1
 

Ref: #851-Rockville-S1
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About System One

Sourced by ZipRecruiter

System One helps employers get work done more efficiently and economically without compromising quality. Over our 35+ year history, we've helped connect thousands of talented people with innovative companies. The excitement of a perfect fit motivates us every single day.

Industry

Business consulting services and recruiting and staffing services

Company size

5,001 - 10,000 Employees

Headquarters location

Pittsburgh, PA, US

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