Senior Systems Administrator Jobs in Denver, CO

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Senior Systems Administrator - TS/SCI with Poly

Leidos

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Aurora, Colorado, USA

Full-time

Leidos is seeking a highly skilled Senior Systems Administrator to support mission-critical operations across various laboratory environments. This role focuses on acquiring, configuring, and maintaining computer servers, operating systems, networks, and network file systems to address complex mission-specific challenges. The Senior Systems Administrator will work in dynamic lab settings, providing technical expertise, troubleshooting, and support to ensure reliable and secure IT infrastructure
Posted 47 days ago | Updated moments ago

Senior Systems Administrator Lead (Remote Opportunity)

Veterans EZ Info, Inc

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Remote

Full-time

VetsEZ is seeking a remote Senior Systems Administrator Lead to support a large-scale federal healthcare modernization program with the Department of Veterans Affairs (VA). This role will provide both technical leadership and hands-on administration of complex Windows server environments operating across hybrid infrastructures within VA and partner systems. The ideal candidate brings deep expertise in Windows-based systems, experience managing technical teams, and a strong focus on uptime, perfo
Posted 4 days ago

Senior Systems Administrator

Gridiron IT Solutions

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Remote

Full-time

Senior System Administrator A Senior System Administrator will work with external vendors and partners, internal DLA teams, end users and PM owners to prevent and correct application and/or environment outages for Enterprise Cloud Infrastructure, to ensure effective daily operation and to resolve problems as they arise. Support Task 4 Cloud Architecture Support drafting, developing, and maintaining documentation and recommendations on cloud design and usage in compliance with DoD Cloud Architec
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Posted 3 days ago

Senior Linux Systems Administrator - 10k Sign on Bonus

Leidos

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Aurora, Colorado, USA

Full-time

Leidos has a new and exciting opportunity for a Senior Linux Systems Administrator in our National Security Sector's (NSS) Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immed
Posted 15 days ago | Updated moments ago

Sr. Systems Administrator (Microsoft O365 Suite)

Kforce Technology Staffing

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Remote or Portsmouth, New Hampshire, USA

Contract, Third Party

RESPONSIBILITIES: Kforce has a client that is seeking a Senior Systems Administrator (Microsoft O365 Suite) in Portsmouth, NH. Summary: The client is seeking an experienced Senior Systems Administrator to lead the integration of acquired companies' backend systems into our existing infrastructure. These roles are critical to ensuring seamless transitions and maintaining operational continuity across platforms such as Slack, Microsoft 365, Jira/Confluence, and more. Key Responsibilities: * Lead
Posted 10 days ago | Updated 1 hour ago

Senior Systems Administrator (Linux/Windows)

GovCIO

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Remote

Full-time

Overview GovCIO is hiring for a Senior Systems Administrator (Linux and Windows) to provide on-going support for the administration of the core system applications and perform operational tasks such as monitoring system resources and perform routine maintenance tasks in support of 24x7 life cycle applications to include on-call support. Work location is in Washington, DC and will be a hybrid remote with periodic onsite customer work activities. Must be willing to work nights, have an active Sec
Posted 24 days ago | Updated 8 hours ago

G2 Directory Services Engineer / Senior Systems Administrator | Active Top Secret clearance

General Dynamics

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Remote

Full-time

Type of Requisition: Pipeline Clearance Level Must Currently Possess: Top Secret Clearance Level Must Be Able to Obtain: Top Secret Public Trust/Other Required: None Job Family: Systems Engineering Job Qualifications: Skills: Directory Services, System Administration, Technical Support Certifications: Security+ CE - CompTIA Experience: 8 + years of related experience ship Required: Yes Job Description: Transform technology into an opportunity as a Directory Services Engineer / Senior Sys
Posted 20 days ago | Updated moments ago

Senior Linux Systems Administrator - REMOTE

First American Financial Corporation

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Remote or Santa Ana, California, USA

Full-time

Who We Are Join a team that puts its People First! Since 1889, First American (NYSE: FAF) has held an unwavering belief in its people. They are passionate about what they do, and we are equally passionate about fostering an environment where all feel welcome, supported, and empowered to be innovative and reach their full potential. Our inclusive, people-first culture has earned our company numerous accolades, including being named to the Fortune 100 Best Companies to Work For list for ten conse
Posted 6 days ago | Updated moments ago

Senior Network/Systems Administrator

GovCIO

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Remote

Full-time

Overview GovCIO is currently hiring for a Senior Network/Systems Administrator with an active Secret clearance. This position will be located in Sterling, VA and will be a fully remote position. Responsibilities Establishes and maintains smooth operation of computer systems (to include operating systems, software and hardware) in networked or stand-alone configurations, maintains system integrity, and upgrades systems and/or servers as required. May create and document new methods supporting
Posted 60+ days ago | Updated 8 hours ago

Sr. ERP and CRM Systems Administrator

Eclaro

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Remote

Contract

ECLARO is a company that delivers talent. We provide fully customizable, comprehensive talent acquisition and management of seasoned professionals through a number of business models, including: Consulting, Professional Hire, Global Integrated Delivery and Managed Services. Kindly email with a Word resume along with the position ID number, your hourly rate and availability. This is Homer Ballega. I am a Recruiter with ECLARO. We are first tier suppliers of technical services to several Fortune 5
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Posted 47 days ago | Updated 25 days ago

G2 SharePoint Systems Administrator | Active Top Secret clearance

General Dynamics

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Remote

Full-time

Type of Requisition: Pipeline Clearance Level Must Currently Possess: Top Secret Clearance Level Must Be Able to Obtain: Top Secret Public Trust/Other Required: None Job Family: Systems Engineering Job Qualifications: Skills: Microsoft SharePoint Administration, SharePoint Management, System Administration Certifications: Security+ CE - CompTIA Experience: 6 + years of related experience ship Required: Yes Job Description: Transform technology into opportunity as a SharePoint / Systems A
Posted 20 days ago | Updated moments ago

Sr Global Security Systems Admin

AFLAC

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Remote

Full-time

Salary Range: $100,000 - $128,000 Job Posting End Date: 8/7/25 We've Got You Under Our Wing We are the duck. We develop and empower our people, cultivate relationships, give back to our community, and celebrate every success along the way. We do it all The Aflac Way . Aflac, a Fortune 500 company, is an industry leader in voluntary insurance products that pay cash directly to policyholders and one of America's best-known brands. Aflac has been recognized as Fortune's 50 Best Workplaces for Dive
Posted 1 day ago | Updated 8 hours ago

Systems Sr Administrator

Unisys

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Remote

Contract

CompuGain is an Information Technology and Business Consulting firm providing project-based solutions, software solutions and professional staffing services. -"Those authorized to work in the United States are encouraged to apply. We are unable to sponsor currently. Position: Systems Sr Administrator Location: Remote Length: Long Term Key Responsibilities Responsible for supporting the functionality and efficiency of one or more operating systems.* Lead teams in the delivery of second and/or th
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Posted 60+ days ago | Updated moments ago

IT Systems Engineer

Virginia Jobs

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Remote or Charlottesville, Virginia, USA

Full-time

Are you a solutions-driven IT professional with a passion for creating seamless, reliable, and innovative computing experiences? The University of Virginia's Information Technology Services (ITS) seeks an experienced systems administrator for a position in our Storage, Backup, and Archive team. Commensurate with the candidate's experience, the role will be filled at the respective level that best matches the candidate's qualifications. In this role, you will support, maintain, and automate a va