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.
$73.45k - $132.78k
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...SuggestedFull timeWork experience placement$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...SuggestedContract workWork experience placementFlexible hours$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...SuggestedContract workWork experience placementLocal areaFlexible hours$122k - $253k
...provides technically advanced full-spectrum cyber, data operations, systems integration and intelligence mission support services to meet... ...**This position is CONTINGENT upon contract award**The System Administrator (SysA) as part of the Platform Team delivers technical...SuggestedFull timeContract work$102.85k - $139.15k
Systems Administrator (Experienced or Senior)Company:The Boeing CompanyBoeing Defense, Space & Security (BDS), Maritime and Intelligence Systems (M&IS), seeks a System Administrator (Experienced or Senior) (Shift Work) to join our Mission Operations team in Herndon, VA....SuggestedPermanent employmentFull timeVisa sponsorshipWork visaRelocation packageFlexible hoursShift workNight shift- ...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...Work experience placement
$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...Contract workWork experience placementFlexible hours- 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
$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 timeWork experience placementImmediate start$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),...Contract workFor contractorsShift work- ...BRPosted: 2026-07-06Location: Herndon, VirginiaClearance: TS/SCI w/Poly SPCompany: Lockheed MartinDescription:• Provide Domain/Systems Administrator Engineer of the Mission LAN, and oversee the maintenance, optimal function, and patching of the LAN’s operating system, and...Full timeFor contractorsWork at officeRemote workMonday to FridayFlexible hours
$145k - $165k
...Overview Systems Administrator Herndon, VA TS/SCI with Poly At Bcore, our strength comes from how we deliver impact to the mission. Whether it’s architecting critical IT solutions, producing actionable intelligence, or developing cutting edge technology, we succeed because...$86k - $114k
...Systems Administrator Reston, Virginia, United States Anduril Industries is a defense technology company with a mission to transform U.S. and allied military capabilities with advanced technology. By bringing the expertise, technology, and business model of the 2...Full timeWork experience placementImmediate start$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 timeLocal area$85k - $130k
...ve described you and your dream workplace, please apply and share in the many benefits and opportunities we offer. Senior Systems Administrator Ensures the stable operation of DLA's computer software systems and network connections. This includes planning,...For contractorsLocal areaRemote work- ...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...
- ...Location: Herndon, Virginia Type: Contract Job #3954 Title: Systems Administrator SME Location: Herndon, VA *Clearance: *Active TS/SCI w/ Polygraph needed to apply * Company Overview: Cornerstone Defense is the Employer of Choice...Contract work
- ...We are seeking a skilled and detail-oriented Systems Administrator to support and maintain enterprise Windows and Linux server environments in a fast-paced, mission-focused organization. This role is responsible for building, configuring, securing, and monitoring systems...Contract work
- ...BT-350 - Systems Administrator Skill Level: Senior Herndon, VA (fully on-site, no remote option) **Please do NOT apply if you do not have an active Poly clearance. Those without a Poly will not be considered.** Required Skills: Demonstrated experience...Remote work
$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 areaFlexible hours$150k - $180k
...position specific requirements which may impact salary Position Overview Amatriot is seeking an experienced Senior Systems Administrator to support the National Programs Intelligence Systems & Application Operating Unit. The SITE III ITS Task Order effort is charged...Full timeLocal areaWeekend work- ...Systems Administrator Location: Herndon, VA Experience: Midlevel /Senior Required US Citizenship Requirements a. Manage the Sponsor’s Research and Development (R&D) environment in the Sponsor’s cloud environments. b. Provide level O&M services, troubleshooting...
- ...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 workWork at office3 days per week
- ...with the competition and the evolving fields of technology. Currently we have an immediate need to add an experienced: Systems Administrator Location: Herndon, VA (on-site client environment) Clearance: TS/SCI with polygraph Compensation: Competitive,...Immediate startShift work
- ...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 workImmediate start
$92k - $185k
...Security Clearance Active TS/SCI with FS Polygraph required Position Apogee's ideal Systems Administrator will provide support for a comprehensive suite of applications. The necessary support & services include systems administration & Tier 2 help desk support in a 24/...Temporary workFlexible hoursShift work$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 timeContract workTemporary workPart timeWork at officeLocal areaRemote workMonday to FridayWeekend workDay shiftAfternoon shift- ...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 timeTemporary workFor contractorsLocal areaRemote workFlexible hours
- ...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 workFor contractorsImmediate startFlexible hours
$85k - $95k
...Macdill AFB, Florida, United States Position Title: Systems Administrator Iron Bow Technologies is for people who believe trust is paramount, transformation is embraced, and the future is here, because "What we do matters"! We are a next generation solutions provider,...Contract workShift work
Do you want to receive more vacancies?
Subscribe and receive similar vacancies to System Administrator. Be the first to apply!
- system admin Herndon, VA
- application system administrator Herndon, VA
- computer systems administrator Herndon, VA
- systems administrator Herndon, VA
- server administrator Herndon, VA
- enterprise administrator Herndon, VA
- IT infrastructure administrator Herndon, VA
- IT administrator Herndon, VA
- junior system admin
- hpc system administrator

