Sign up to access all features of our service.
  • Job search
  • Favorites
  • Create a CV
    New
  • Salaries
  • Subscriptions

System Administrator

Cornerstone Defense

System Administrator

System Administrator Herndon, VA Active TS/SCI with Polygraph

Company Overview: Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government. Realizing early on that our most prized assets are our employees, we continually focus our attention on improving the overall work/life experience they have supporting the mission. Our Team is pushed every day to use their industry leading knowledge to provide end-to-end solutions to combat our nation's toughest and most secure problems. If you are looking for a place to not only be professionally challenged, but encouraged and supported by a company that cares, don't look any further than Cornerstone Defense.

Job Responsibilities:
  • Support a small group of end users who use our system and several other systems that we support
  • Monitor system performance and troubleshoot issues, sometimes under time pressure
  • Analyze system performance, identify bottlenecks, and document proposed optimizations to improve overall system efficiency and responsiveness
  • Maintain accurate documentation of system configurations, procedures, and troubleshooting steps
  • Interface with customers and represent the entire System Admin Team during high impact operations
Required Skills:
  • 5+ years of related work experience
  • Experience in System Administration (i.e. Linux/Unix or Windows platforms)
  • Experience in communicating with customer representatives in a variety of forums, in both written and spoken form, regarding technical subjects
  • Willingness to successfully complete on-the-job (OJT) training to confirm ability to perform assigned duties and tasks
  • Willingness and ability to work variable shifts, including days, nights, weekends, and holidays
Desired Skills:
  • Experience managing and maintaining servers, workstations, and related infrastructure components
  • Experience with Active Directory, Group Policy, DNS, DHCP, and other core services.
  • Advanced troubleshooting skills and problem-solving abilities and able to diagnose and resolve complex technical issues
  • Expertise in on-premises virtualization (AHV, VMWare ESXi, Hyper-V, etc.) or cloud expertise (AWS or Azure)
  • Experience with VDI infrastructure, monitoring infrastructure, securing infrastructure
  • Experience with documenting technical details in Confluence and task tracking in Jira
  • Cloud, INFOSEC, or any recent IT certifications
  • Previous shift-work experience

Company Benefits: Cornerstone Defense offers a comprehensive list of benefits, designed to give employees and their families several options to choose from when selecting benefits that best fit their needs. These offerings include not only a full suite of the traditional Medical/Dental/Vision insurances, but also a number of other benefits and perks to include, but not limited to: A 401(K) plan with a company match, tuition and training assistances, paid vacation/leave, a fitness reimbursement program, college savings plan, commuter benefits, financial advisory services, flex spending accounts, health savings accounts, STD/LTD coverage, life and AD&D insurance, employee assistance programs, life financial planning assistance, and legal resources.

Vacancy posted 3 days ago
Similar jobs that could be interesting for youBased on the System Administrator in Herndon, VA vacancy
  • $81.5k - $138.55k

    Join ICF’s IT Modernization Team — Where Innovation Meets ImpactOur IT Modernization division is seeking a skilled GitHub System Administrator to support enterprise software delivery and DevOps transformation initiatives. In this role, you will administer, configure, and... 
    Suggested
    Full time
    Contract work
    Work experience placement
    Work at office
    Remote work

    ICF

    Reston, VA
    2 days ago
  • $103.8k - $218.1k

    Job Title: Classified Systems Administrator and ISSOJob Category: Information TechnologyTime Type: Full timeMinimum Clearance Required to Start: SecretEmployee Type: RegularPercentage of Travel Required: Up to 10%Type of Travel: Continental US* * *The OpportunityCACI is... 
    Suggested
    Contract work
    Work experience placement
    Flexible hours

    CACI International

    Herndon, VA
    1 day ago
  • $105.1k - $231.1k

    Job Title: Infrastructure/Systems AdministratorJob Category: Information TechnologyTime Type: Full timeMinimum Clearance Required to...  ...Opportunity:Join our dynamic team as an Infrastructure/Systems Administrator and play a crucial role in maintaining and enhancing our IT... 
    Suggested
    Contract work
    Work experience placement
    Flexible hours

    CACI International

    Sterling, VA
    2 days ago
  •  ...effective installation and performance of advanced operating system hardware and software on servers. • Install new software releases...  ...projects • Thorough knowledge of good server and system administration principles Additional InformationAll your information will be... 
    Suggested
    Work experience placement

    Xinnovit

    Herndon, VA
    4 days ago
  • $112k - $179k

    ResponsibilitiesJob Summary:We are seeking a highly skilled and experienced System Administrator to join our team. This position will require the candidate to work closely with government customers, contractor Project Lead, Information Systems Security Officer (ISSO),... 
    Suggested
    Contract work
    For contractors
    Shift work

    Peraton Corporation

    Herndon, VA
    4 days ago
  • $86.6k - $181.8k

    Job Title: DevSecOps Systems AdministratorJob Category: Information TechnologyTime Type: Full timeMinimum Clearance Required to Start...  ...maintaining a critical DoD system? Join our team as a Systems Administrator! You will get to use your technical skills to implement and... 
    Contract work
    Work experience placement
    Flexible hours

    CACI International

    Reston, VA
    4 days ago
  • $146k - $194k

     ...technology, and business model of the 21st century’s most innovative companies to the defense industry, Anduril is changing how military systems are designed, built and sold. Anduril’s family of systems is powered by Lattice OS, an AI-powered operating system that turns... 
    Full time
    Work experience placement
    Immediate start

    Anduril Industries

    Reston, VA
    2 days ago
  • Company DescriptionArtech Information Systems is the #12 Largest IT Staffing Company in the U.S. and an employer of choice for over 7,000 consultants. We recruit world-class talent for IT, engineering, and other professional jobs at 70+ Fortune and Global 500 companies... 
    Full time

    Artech

    Reston, VA
    1 day ago
  • $90.3k - $189.6k

    Job Title: Systems AdministratorJob Category: Information TechnologyTime Type: Full timeMinimum Clearance Required to Start: TS/SCI...  ...Local* * *The OpportunityCACI is seeking a Classified Systems Administrator to support and maintain mission-critical classified information... 
    Contract work
    Work experience placement
    Local area
    Flexible hours

    CACI International

    Sterling, VA
    1 day ago
  •  ...POSITION OVERVIEW The Senior Systems Administrator ensures the stable operation of Customer's computer software systems and network connections in support of the DoD. This role is responsible for planning, installing, configuring, maintaining, and optimizing network software... 
    Contract work
    Local area
    Remote work

    BaseCamp Consulting & Solutions

    Reston, VA
    21 hours ago
  •  ...Overview Leidos has an opening for a Systems Administrator in Reston, Virginia. Responsibilities include installation, configuration, administration, support and maintenance of systems, including associated hardware. Responsibilities may include management of systems infrastructures... 
    Work experience placement

    Leidos

    Reston, VA
    1 day ago
  •  ...Sr Systems Administrator Be Challenged and Make a Difference In a world of technology, people make the difference. We believe if we invest in great people, then great things will happen. At AnaVation, we provide unmatched value to our customers and employees through... 
    Temporary work
    Immediate start

    AnaVation LLC

    Reston, VA
    2 days ago
  •  ...Technology and Business consulting services. We are in search of a highly motivated candidate to join our talented Team. Job Title: Systems Administrator II Location: Reston, VA Job Location: Assist in server operations, resolving customer issues for Unix/Linux based... 

    Ampcus

    Reston, VA
    2 days ago
  •  ...System AdministratorReston, VA, USA Full-time Clearance: Top Secret/SCIJob DescriptionAs a systems administrator on our program, you will:Provide resolve break fix tickets and ensure customers receive the highest level of customer support.Help customers overcome tough... 
    Full time

    Beyond SOF

    Reston, VA
    2 days ago
  • $82.55k - $110.05k

     ...Excellence * Leadership * Transparency * Member-Driven we need you on our team! We are seeking a reliable and detail-oriented Systems Administrator to oversee, maintain, and secure our core IT infrastructure. In this role, you will manage both on-premises and Cloud... 
    Local area
    Flexible hours

    American College of Radiology

    Reston, VA
    2 days ago
  •  ...Responsibilities Support the National Programs Intelligence Systems & Application Operating Unit. Perform installation, configuration...  ...with 3+ years of experience. Proven experience in system administration, specifically with Linux, including RHEL and Ubuntu, and UNIX... 

    Jobtailor

    Herndon, VA
    23 hours ago
  •  ...Overview VTG is seeking a skilled Systems Administrator to manage, maintain, and support enterprise IT infrastructure. This role is responsible for ensuring the reliability, security, and performance of servers, networks, and systems while supporting day-to-day operations... 

    VTG Defense

    Herndon, VA
    4 days ago
  •  ...We are searching for a Systems Administrator to join the Reston, VA location of the Digital Engineering Department in the Cyber, Modeling, and Simulation Division of the Information Advantage Office at the Applied Research Laboratory (ARL) at Penn State. You will maintain... 
    Work at office
    Immediate start

    The Applied Research Laboratory at Penn State University

    Reston, VA
    4 days ago
  •  ...Systems Administrator Job Locations US ID 2025-4271 Category Defense Type Full Time Overview Amyx is seeking to hire a Systems Administrator for our Defense Logistics Agency client, remotely. Responsibilities... 
    Full time
    Temporary work
    For contractors
    Local area
    Remote work
    Flexible hours

    Amyx

    Reston, VA
    4 days ago
  •  ...System Administrator LOCATION Reston, VA 20190 CLEARANCE TS/SCI Full Poly (Please note this position requires full U.S. Citizenship) KEY SUMMARY We are seeking a proactive and detail-oriented System Administrator to join our team and help maintain... 
    Temporary work
    For contractors
    Immediate start
    Flexible hours

    Cymertek

    Reston, VA
    1 day ago
  •  ...IT Enterprise System Admin 5+ years of experience in an IT enterprise System Admin role or Cloud Admin position Microsoft Azure Administrator experience Microsoft Azure Network Solutions experience Windows admin skills (Active Directory, DNS, Group Policy)... 

    The Dignify Solutions, LLC

    Herndon, VA
    3 days ago
  •  ...Senior Systems Administrator Securiport LLC is a U.S. company based in Reston, VA, specializing in the design and implementation of passenger biometric recognition, immigration processing, and intelligent information reporting and management systems based on advanced... 
    Contract work
    Local area
    Monday to Friday

    SECURIPORT

    Reston, VA
    23 hours ago
  • $70k - $100k

     ...RESPONSIBILITIES Manage the day-to-day operations by monitoring system performance, configuration, maintenance, and repair. Ensure...  ...Seven years of overall professional experience in the systems administration field. Five years of overall experience in Microsoft... 
    Full time
    Contract work
    Temporary work
    Part time
    Work at office
    Local area
    Remote work
    Monday to Friday
    Weekend work
    Day shift
    Afternoon shift

    TekSynap

    Reston, VA
    2 days ago
  • $165k - $179k

     ...Systems Administrator Location: Reston, Va Clearance- TS/SCI w/FSP Salary: $165k-179k/yr The above salary range represents the range expected for the position; however, final salary offers are based on a number of factors such as the position’s responsibilities... 

    ABBTECH

    Reston, VA
    3 days ago
  • $70k - $95k

     ...the cost of IT ownership. We provide executive-level, white-glove support. Opening Solvere One is seeking highly qualified System Administrator candidates to provide support to clients. The duties of this role include ensuring clients meet Solvere One technical best practices... 
    Full time
    Local area

    Solvere One LLC

    Sterling, VA
    1 day ago
  • $104k - $166k

     ...Systems Administrator Job Locations US Requisition ID 2026-169758 Position Category Information Technology Clearance Public Trust Responsibilities Peraton is seeking a System Administrator. This position is... 
    Contract work
    For contractors
    Work at office
    Remote work
    Shift work
    Weekend work
    Afternoon shift

    Peraton

    Reston, VA
    1 day ago
  • $150k - $180k

     ...certifications in addition to other position specific requirements which may impact salary Position Overview The System Administrator manages and supports enterprise, regional, and local server environments hosting mission-critical applications and... 
    Full time
    Local area

    The Amatriot Group

    Reston, VA
    2 days ago
  •  ...Description: • Provide Domain/Systems Administrator Engineer of the Mission LAN, and oversee the maintenance, optimal function, and patching of the LAN’s operating system, and the GOTS, COTS, and custom software products running on it. • Perform system startup, shutdown... 
    Full time
    For contractors
    Work at office
    Remote work
    Relocation
    Flexible hours
    Shift work

    Lockheed Martin Corporation

    Herndon, VA
    1 day ago
  •  ...Job Title: Systems Administrator Location: Herndon, VA (Hybrid: 3 days/week onsite: Tuesday, Wednesday, Thursday) Type: 6+ months Contract Rate: $Open /hr. Job Description: The ideal candidate is a reliable, hands-on Microsoft 365 administrator with strong... 
    Contract work
    Work at office
    3 days per week

    TWO95 International

    Herndon, VA
    4 days ago
  •  ...insight and leadership to solve the nation's most critical national security challenges in the most demanding environments.This Systems Administrator position is located in Northern Virginia with flexible core hours.The Systems Administrator provides in-depth support and... 
    Work at office
    Flexible hours

    Cadre

    Reston, VA
    2 days ago

Do you want to receive more vacancies?

Subscribe and receive similar vacancies to System Administrator. Be the first to apply!