Senior System Administrator
$190k - $210kCornerstone Defense LLC
Title: Senior System Administrator Location: Annapolis Junction, MD Compensation Range: $190 -$210K Clearance: Active TS/SCI 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. 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. Benefits Overview 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 Position Description Provide support for implementation, troubleshooting and maintenance of Information Technology (IT) systems. Manages IT system infrastructure and any processes related to these systems. Provides support to IT systems including day-to-day operations, monitoring, and problem resolution for all the client / server / storage / network devices, mobile devices, etc. Provides Tier 1 (Help Desk) and Tier 2 (Escalation) problem identification, diagnosis, and resolution of problems. Provides support for the escalation and communication of status to agency management and internal customers. Provides support for the dispatch system and hardware problems and remains involved in the resolution process. Configures and manages UNIX and Windows operating systems and installs / loads operating system software, troubleshoot, maintains integrity and configures network components along with implementing operating system enhancements to improve reliability and performance. Qualifications Bachelor's degree in Computer Science or related discipline from an accredited college or university is required. Five (5) years of additional SA experience may be substituted for a bachelor's degree. Ten (10) years’ experience as a SA in programs and contracts of similar scope, type, and complexity is required. Responsibilities Provide support for implementation, troubleshooting and maintenance of IT systems. Provide support for implementation, troubleshooting and maintenance of IT systems. Provide Tier 1 (Help Desk) problem identification, diagnosis and resolution of problems. Manage the daily activities of configuration and operation of IT systems. Provide assistance to users in accessing and using IT systems. Provide Tier 1 (Help Desk) and Tier 2 (Escalation) problem identification, diagnosis and resolution of problems. Provide support to IT systems including day-to-day operations, monitoring and problem resolution for all the client/server/storage/network devices, mobile devices, etc. Provide support for the escalation and communication of status to agency management and internal customers. Optimize system operations and resource utilization and perform system capacity analysis and planning. Provide in-depth experience in trouble‑shooting IT systems. Provide detailed analysis and feedback to agency management and internal customers for escalated tickets. Provide support for the dispatch system and hardware problems and remains involved in the resolution process. Configure and manage UNIX and Windows (or other applicable) operating systems and install/load operating system software, troubleshoot, maintain integrity of and configure network components, along with implementing operating systems enhancements to improve reliability and performance. Required Skills Three (3) years of experience installing, configuring, maintaining, troubleshooting, and using system security (container security, virtual machine security, security boundary enforcement), configuration, and reporting tools. Experience with Windows/UNIX administration and configuration Three (3) years of experience with the following tools is strongly preferred: ELK, Tripwire, VMware, RedHat SELinux security tool suite. #J-18808-Ljbffr Cornerstone Defense LLC
$168k - $250k
...information theft and augment protections for our customers systems. If you are looking to join a company that provides... ...consider joining our team! Peterson is seeking a talented Senior Systems Administrator . Provides day to day systems administration and support...Senior$115k - $175k
...a small company with the impact of a big mission. Riverstone is seeking a motivated, career, and customer-oriented Senior Systems Administrator to join our team at Annapolis Junction, Maryland . This is an onsite position. Primary Responsibilities: • Provides...SeniorHourly payContract workWork experience placement$120.8k - $265.8k
...Job Title: Senior Systems Administrator Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type: Regular Percentage of Travel Required: Up to 10% Type of Travel: Local The Opportunity...SeniorFull timeContract workWork experience placementLocal areaImmediate startFlexible hours- ...Que Technology Group, Inc., is seeking a Senior System Administrator to provide High Performance Computing (HPC) services in the form of HPC enhanced sustainment capabilities. Responsibilities include, but are not limited to: Provide support for implementation...SeniorTemporary workImmediate start
$125k - $180k
...Modern Technology Solutions, Inc. (MTSI) is hiring a Senior Systems Administrator in Annapolis Junction, Maryland. Qualified candidates must be U.S. citizens with a TS/SCI clearance and Full Scope Polygraph. Responsibilities: *Provide support for implementation...SeniorFull timeContract workImmediate startWorldwideFlexible hours$135k - $174k
Intelliforce-IT Solutions Group, LLC., located in Maryland, is seeking a System Administrator for Mission Compute Infrastructure. The role involves managing advanced compute infrastructure, notably NVIDIA platforms, and entails real ownership of systems and workflows....Senior$170k - $175k
A leading technology consulting firm is seeking a Senior System Administrator with an active TS/SCI clearance and polygraph. The role involves implementing and maintaining IT systems, providing Tier 1 and Tier 2 support, and managing daily operations across various environments...Senior- A technology services provider is seeking a Senior System Administrator to deliver enhanced High Performance Computing services. This role involves troubleshooting and managing IT systems, ensuring optimal performance for various devices. The ideal candidate will have ten...Senior
- Cornerstone Defense LLC is seeking an Expert System Administrator in Annapolis Junction, MD. Candidates must have an active TS/SCI clearance and a minimum of 15 years of experience in system administration. The role entails supporting the implementation and maintenance...Senior
- A leading technology firm in Maryland seeks a Senior System Administrator to provide High Performance Computing services. The ideal candidate must have a Bachelor's degree in a technical discipline and at least 10 years of relevant experience. Responsibilities include IT...Senior
- Power3 Solutions is seeking a System Administrator III to provide support for the implementation and maintenance of IT systems. This role includes troubleshooting and managing infrastructure while ensuring optimal performance. The ideal candidate will have at least ten...Senior
- HRB is looking for a System Administrator III located in Annapolis Junction, MD. The role requires TS/SCI clearance and involves managing IT systems, providing day-to-day support, and optimizing system performance. Ideal candidates will have ten years of experience in...Senior
- Stanley Reid & Company is seeking a System Administrator for a role based at Ft. Meade, Maryland. Ideal candidates will have a Bachelor's Degree in a technical field and over 5 years of relevant experience. The position demands a TS/SCI clearance with a Full-Scope Polygraph...SeniorHourly pay
- A technology-focused defense contractor in Annapolis Junction, MD is seeking a System Administrator II with TS/SCI clearance. This role encompasses responsibility for implementation, troubleshooting, and maintenance of IT systems, including providing essential Tier 1 and...SeniorFor contractors
- Power3 is looking for a System Administrator III in Annapolis Junction, MD. The candidate will provide support for implementation, troubleshooting, and maintenance of IT systems while managing system infrastructure. Responsibilities include Tier 1 and Tier 2 problem resolution...Senior
- A technology firm is seeking a Senior System Administrator to manage CNO capabilities and foster a high-performance operational IT environment. The ideal candidate must be a U.S. citizen with an active clearance and possess a Bachelor’s degree in a relevant field. This...Senior
$172k - $210k
A technology services firm is seeking a Systems Administrator with extensive experience in Linux and Windows environments. Candidates must be US citizens with an active TS/SCI security clearance. Responsibilities include supporting users, documenting security processes,...Senior- Senior Systems Administrator Location: On‑Site at Customer Location (Annapolis Junction, MD) Clearance Required: TS/SCI with Poly Are you ready to take your systems administration expertise to the next level and support mission‑critical operations? BigBear.ai is seeking...Senior
$10k
When You Love the Work You Do, Any Mission Is Possible Position: Senior System Administrator - CNO Capabilities *** (Active Clearance with a Polygraph is Required) We’re on multiple contracts and have many opportunities. It is encouraged if applicants don’t meet all...SeniorExtra incomeWork at officeFlexible hours- Overview Que Technology Group, Inc., is seeking Senior System Administrator to provide High Performance Computing (HPC) services in the form of enhanced HPC sustainment capabilities. These capabilities include Multi-vendor HPC servers, HPC clusters, and SPD servers. Responsibilities...SeniorTemporary workImmediate start
- Que Technology Group, Inc., is seeking a Senior System Administrator to provide High Performance Computing (HPC) services in the form of HPC enhanced sustainment capabilities. Responsibilities Provide support for implementation, troubleshooting and maintenance of IT systems...SeniorTemporary workImmediate start
- Innovative Systems & Solutions | Full time - Onsite Senior System Administrator - FFNN-8807 Annapolis Junction, United States | Posted on 03/17/2026 Innovative Systems & Solutions (ISS) works with a wide spectrum of talent to establish an atmosphere that stimulates creativity...SeniorFull timeTemporary workLocal areaImmediate start
- Description Lockheed Martin, Rotary Mission Systems Cyber & Intelligence invites you to step up to one of today’s most daunting... ...keeps modern life moving. Responsibilities Serve as the senior system administrator with extensive experience supporting Windows‑based...SeniorTemporary workFlexible hours
$135k - $174k
System Administrator, Mission Compute Infrastructure At Intelliforce, we support mission environments where performance, reliability, and speed are not optional. In this role, you will help sustain and evolve a high‑performance operational IT environment supporting CNO...SeniorContract workWork at officeImmediate startRelocationVisa sponsorshipFlexible hours$170k - $250k
Job Description The System Administrator III is a senior technical contributor responsible for designing, implementing, securing, and maintaining the organization’s core IT infrastructure. This role provides Tier 3 support for complex incidents, leads infrastructure projects...SeniorPermanent employmentContract workWork experience placementLocal area$137k - $169k
...RESPONSIBILITIES Monitors and manages system resources, including CPU usage, disk usage... ...efficiency. Performs system security administration functions, including creating user profiles... .... Overview We are seeking a Senior Systems Administrator to join our Task Order...SeniorFull timeContract workTemporary workLocal areaShift work$170k - $250k
**Worker Type**Regular**Job Description****Summary**The System Administrator III is a senior technical contributor responsible for designing, implementing, securing, and maintaining the organization’s core IT infrastructure. This role provides Tier 3 support for complex...SeniorPermanent employmentContract workWork experience placementLocal area$175k - $225k
...on bringing innovative solutions to the difficult mission problems facing our customers. Description The System Administrator provides support for implementation, troubleshooting and maintenance of Information Technology (IT) systems. Manages IT system...SeniorHourly payExtra incomeTemporary workImmediate startFlexible hours$128k - $214.4k
...adventure begins now-unleash your potential with MANTECH! MANTECH seeks a motivated, career- and customer-oriented Sr Cloud System Administrator to join our team in Annapolis Junction, MD. Our team delivers enterprise infrastructure capabilities for a global...SeniorHourly payContract workTemporary workWork experience placementWork at officeLocal areaRemote work- ...SECURITY CLEARANCE: TS/SCI with both Polygraphs are required POSITION : Senior Systems Administrator LCAT : Systems Administrator, Level 3 REQUISITION : MAR-SA3-10.070125 LOCATION : Ft. Meade, Maryland JOB DESCRIPTION : CSG is searching for...SeniorRemote work
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