CyberSecurity/SysAdmin
Cornerstone Defense
Systems Administrator
Active Secret w/ Polygraph needed to apply* 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. 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.
Benefits Overview: Cornerstone Defense offers a very comprehensive benefits package including, but not limited to: Medical, Dental and Vision Plans * Generous PTO Policy * 401(k) * HSA and FSA options * Life and Disability Insurance * Tuition Reimbursement and Training * Perks at Work Discount Program * Referral Program * Leads Generation Program * CollegeAmerica 529 * Fitness Reimbursement Program * Travel Assistance * Norton Lifelock Benefit Solutions * Life Planning Financial & Legal Services
Network Infrastructure
Networking concepts, protocols, and security methodologies
Network traffic flow (TCP/IP, OSI, ITIL)
Performance tuning tools and techniques
Remote access technologies
Network protocols (TCP/IP, DHCP, DNS, directory services)
File system implementations (NTFS, FAT, EXT)
IT security principles (firewalls, DMZs, encryption)
Network security architecture (topology, protocols, defense-in-depth)
Cybersecurity principles, threats, and vulnerabilities
National/international cybersecurity laws, regulations, and policies
Organizational IT security policies (account management, access control)
Data security standards (PII, PCI, PHI)
System administration, network, and OS hardening techniques
Software-based protection tools (firewalls, antivirus, anti-spyware)
Enterprise IT architecture
Cloud Computing
Service models (SaaS, IaaS, PaaS)
Deployment models (private, public, hybrid)
Cloud security strategy and architecture
$90k
...Exceptional Performance! Chenega Services & Federal Solutions, a Chenega Professional Services ' company, is looking for an IT Systems Administrator to provide network infrastructure support services to the Department of the Navy's Commander, Operational Test and...Suggested- ...reasonably be assigned.) Involved in all phases of test system design, including requirements generation, hardware design, software... ...Experience: 10+ years of IT experience 5 of system administration supporting Windows in network environment. Experience with networking...SuggestedSeasonal workRemote work
- ...Job Description: Job Summary We are seeking a mission-driven HCL Domino Systems Administrator to support 24/7/365 operations, maintenance, and sustainment of enterprise-level messaging systems supporting global fleet and communications operations. This role ensures...SuggestedRemote workNight shift
- ...Systems Administrator I Tamayo Federal Solutions, LLC is seeking qualified Systems Administrator I. The qualified candidate should have experience/knowledge in the following areas: Design architecture including software, hardware, and communications to support...Suggested
- ...Systems Administrator - Multiple Locations (Norfolk, Quantico, Springfield) Join LCE and become part of a 100% employee-owned, mission-focused DoD government contractor, that takes pride in a culture where every individual has a genuine stake in our success. Employee...SuggestedFor contractorsWork experience placementLocal areaImmediate startRelocationFlexible hours
- ...The Systems Administrator provides enterprise IT and network infrastructure support to the Naval Surface Warfare Center (NSWC) . This role is responsible for the administration, maintenance, security, and performance of Government information systems supporting mission...Local areaRemote work
- ...The Sr. Systems Administrator is at the forefront of deploying and supporting new technologies at HRT. In support of the strategic initiatives following the established project plan under the direction of the Director of Technology Services, implement and support datacenter...Seasonal workWork at officeLocal areaRemote work
$70k - $80k
...over 20 years’ Cybersecurity and Government Contracting experience. Watershed is looking for a Senior Network and Computer Systems Administrator to install, configure, and support an organization's local area network (LAN), wide area network (WAN), and Internet systems...Contract workLocal areaMonday to Friday- ...Overview Client First Technologies is currently seeking a Systems Administrator to support an upcoming contract. The Systems Administrator provides technical expertise supporting the operation, maintenance, and security of enterprise IT systems. This role ensures...Full timeContract work
- ...Systems Administrator III Tamayo Federal Solutions, LLC is seeking qualified Systems Administrator III. This position will: Play a crucial role in managing and optimizing complex IT systems supporting naval ship and submarine maintenance operations Oversee...
$60k - $65k
...Veteran Owned Small Business with over 20 years’ Cybersecurity and Government Contracting experience. Watershed is looking for a Systems Administrator to Install, configure, and support an organization's local area network (LAN), wide area network (WAN), and Internet systems...Contract workLocal areaMonday to Friday$65k - $90k
Overview: SimVentions is 100% employee-owned and proudly ranked among Virginia’s Best Places to Work year after year! The Systems Administrator / IT Operations Specialist will support the day-to-day operations, maintenance, monitoring, and administration of a secure,...Contract workTemporary workCasual workRemote workFlexible hours- ...System Administrator / C4I Systems Support Candidate will support a variety of platforms to include: GCCS, C2PC, C2BMC, JADOCS, ASSET, CAS, BFFT, TBMCS, ADSI and TACVIEW. The candidate will perform engineering and administration duties on Windows and Linux platforms...
- ...Senior Systems Administrator (SharePoint) ID 2026-3391 Job Locations US-VA-Portsmouth Category Information Technology Type Regular Full-Time Overview DecisionPoint Corporation is seeking a Senior Systems Administrator (...Full timeContract workFor contractorsLocal area
- ...Senior Systems Administrator (SharePoint) Location: Norfolk, VA, US Job ID: ATR 17829 Job Description Job Title: Senior Systems Administrator (SharePoint) Job Location: Norfolk, VA (Onsite at the Naval Ship Yard) Eligibility/Clearance: ~ US Citizenship...Contract work
- ...as information technology (IT) and communications consulting, system engineering, integration, deployment and operation of state-of... ...seeking a highly skilled Cloud Infrastructure & Citrix Systems Administrator to support the Navy Maritime Maintenance Enterprise Solution...Temporary workInterim roleWork at officeLocal areaShift work
- ...Overview ISHPI is seeking a Windows Systems Administrator (on-site) to support the Command and Control (C2) Afloat Integration Support (C2AIS) for the U.S. Coast Guard Command, Control, Communications, Computers, Cyber and Intelligence Service Center (C5ISC) in Portsmouth...
- ...Position Description & Qualifications Serco seeks a Cyber Systems Administrator for its Combat Air Force Distributed Mission Operations (CAF DMO) 3.0 program in Hampton, VA. The CAF DMO 3.0 program, via its Distributed Mission Operations Network (DMON), provides world...Full timeContract workPart timeLocal areaFlexible hours
- DoD SkillBridge Intern - (GCCS-M Systems Administrator) (Active Duty Service Members) Location US-VA-Norfolk ID 2026-11173 Category Systems Administrator Position Type Regular Full-Time Application Open Date 4/30/2026...Full timeFor contractorsInternshipLocal area
- ...Linux System Administrator The Linux System Administrator will supervise and manage the daily activities of configuration and operation of Linux-based business systems supporting the NMMES program. This position requires expertise in optimizing system operations and...
- ...journey starts now-protect and innovate with MANTECH! MANTECH seeks a motivated, career and detail-oriented Technology & Systems Administrator to support our operations in Portsmouth, VA . This is an onsite position. In this role, you will be involved in...Full timeLocal areaRemote work
$75.2k - $158.1k
Job Title: TMIP-M System Administrator Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: Secret Employee Type: Regular Percentage of Travel Required: Up to 75% Type of Travel: Outside Continental US * * * The Opportunity: In...Full timeContract workWork experience placementFlexible hours$75.2k - $158.1k
...Job Title: Sr. Systems (Database) Administrator Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: TS/SCI Employee Type: Regular Percentage of Travel Required: Up to 10% Type of Travel: Continental US * *...Full timeContract workWork experience placementImmediate startFlexible hours- ...Job Type Full-time Description The Systems Administrator II - Technical Lead (Individual Contributor) will serve as a senior technical contributor and operation leader within our small, hands-on IT team. This role operates as a co-primary technical resource...Full timeCasual workLocal area
- ...Apply Description Senor Network and Computer Systems Administrator At B&A, we foster and embrace a distinct set of values that we live by and instill in all aspects of our organization: dedication, commitment, partnership, trust, and recognition...Full timeWork at officeLocal area
- ...Job Description Job Description JOB POSTING Systems Administrator I VIcom - Virginia Integrated Communication – Virginia Beach, VA Department: UCC/Networking - VB Reports to: Director of UCC/IT Integration Support Services The Systems Administrator...Full timeRemote work
$99k - $225k
...strategies. This role owns the end-to-end lifecycle for Endace systems, including design, installation, configuration, maintenance,... ...of experience in cybersecurity engineering, Linux system administration, network security, or SOC tooling ~ Experience supporting...Full timeContract workPart timeWork at officeLocal areaRemote work- ...Leads and performs the maintenance, configuration, and day to day administration of Finance software applications globally for PRA Group. These... ...integrations Support our out-source partners in monitoring system performance Review upcoming application updates and...Work experience placementLocal areaWork visa
$101k - $105k
...SharePoint Systems Administrator - Top Secret Join our dynamic IT team as a SharePoint Systems Administrator where you'll play a critical role in managing and optimizing our enterprise SharePoint infrastructure. This position requires an active Top-Secret clearance...$93.5k - $126.5k
...Trust/Other Required: None Job Family: IT Infrastructure and Operations Skills: Information Technology (IT) Systems,System Administration,System Security Certifications: MCSA: Windows Server 2012 (70-410, 70-411, 70-412) | Microsoft - Microsoft, CompTIA...Temporary workImmediate startWork from homeWorldwideFlexible hoursShift work
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