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IT System Administrator Jobs (On-site work)

181 Job Offers

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Intermediate Systems Administrator Operations Support Specialist
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Seeking an Intermediate Systems Administrator for an 18-month contract in North York. Provide critical Tier 1 support and administer systems like SharePoint for public sector healthcare projects. Requires 5+ years of experience with public-sector health IT and methodologies like PMI. Competitive ...
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Canada , North York
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330.15 - 369.56 CAD / Hour
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Randstad
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System Administrator Senior
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Seeking a Senior System Administrator to support HPC and data analytics for a critical research lab. This role requires extensive Linux/Windows expertise, TS/SCI clearance with polygraph, and 8+ years of lead experience. You will design, maintain, and optimize cutting-edge systems in a mission-fo...
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United States , Catonsville
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77600.00 - 176000.00 USD / Year
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Booz Allen Hamilton
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System Administrator
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Seeking a Linux System Administrator in Columbia, MD to design and maintain Cross Domain Solutions for critical DoD cybersecurity missions. Requires 3+ years with RHEL/CentOS, VMware, Git, and an active TS/SCI with polygraph. You'll enhance enterprise security and performance while receiving comp...
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United States , Columbia
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77600.00 - 176000.00 USD / Year
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Booz Allen Hamilton
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Core Systems System Administrator
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Join our global technology team in Singapore as a Core Systems Administrator. You will maintain critical security systems, including Physical Access Control, and ensure the integrity of Windows/Linux servers. This role requires 5+ years of sys admin experience and offers professional growth with ...
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Singapore , Singapore
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Not provided
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M.C. Dean, Inc
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Systems & Network Administrator
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Join our Dallas team as a Systems & Network Administrator. This hands-on contract role requires M365 Admin Portal & Azure expertise for network management, user support, and system maintenance across a large campus. You will ensure seamless IT operations, provide excellent help desk support, and ...
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United States , Dallas
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Not provided
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Robert Half
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Network and System Administrator
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Mauritius , Labourdonnais
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Not provided
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International School of Monza
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Systems Administrator
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Seeking a Senior Systems Administrator in Austin to manage critical Windows Server infrastructure. You'll handle AD, Azure, security hardening, and automation using PowerShell. This role offers competitive healthcare, 401(k), and commuter benefits for a skilled, independent professional.
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United States , Austin
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Robert Half
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Systems Administrator
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United States , Newburyport
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Not provided
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Robert Half
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System Administrator
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Lithuania , Vilnius
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1500.00 - 2500.00 EUR / Month
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Vention
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Systems Administrator
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Join our team as a Systems Administrator in Newberg. You will administer Windows Server, manage Azure infrastructure, and support Entra ID. This mid-level role focuses on system stability, maintenance, and troubleshooting. We offer comprehensive benefits including medical, dental, vision, and a 4...
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United States , Newberg
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Robert Half
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Systems Administrator
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Join our growing systems & software engineering team in Dahlgren, VA. Apply your 10+ years of technical expertise in system administration, security, and network management to modernize Navy weapons and sensor systems. This on-site role requires IAT Level 2 certification and offers the chance to ...
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United States , Dahlgren
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Amentum
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System Administrator
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United States , Colorado Springs
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75094.23 - 137446.63 USD / Year
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Arcfield
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System Administrator Level 3
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United States , Annapolis Junction
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Columbia Technology Partners
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Systems Administrator / Engineer II
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United States , Indianapolis
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Barbaricum
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Systems Administrator
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United States , Santa Monica
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Robert Half
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Systems Administrator
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Seeking a Systems Administrator in Honolulu to manage VDI Thin Client networks across classified and non-classified environments. This role requires a Top Secret clearance, expertise in VMware, Windows Server, and STIG compliance. We offer competitive benefits including a 401(k) match and compreh...
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United States , Honolulu
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80000.00 - 85000.00 USD / Year
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Innovative Management Concept
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Systems Administrator
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United States , Mountain View
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Astrion
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Systems Administrator
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United States , Richardson
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Robert Half
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Senior Systems Administrator
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United States , Fort Mill
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Robert Half
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Systems Security Administrator
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United States , Schaumburg, Illinois
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Robert Half
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Explore a world of opportunity in IT System Administrator jobs, the backbone of modern organizational technology. IT System Administrators are the essential professionals responsible for installing, configuring, maintaining, and securing the critical hardware and software systems that keep businesses running. This career path sits at the intersection of technical expertise and operational reliability, offering a dynamic and rewarding profession for those who enjoy problem-solving and ensuring seamless digital workflows. In a typical role, an IT System Administrator’s responsibilities are vast and vital. They manage and monitor an organization's servers, often leveraging virtualization platforms like VMware or Hyper-V, and are increasingly involved with cloud services from providers such as AWS, Microsoft Azure, or Google Cloud Platform. A core duty is maintaining network services, including Active Directory, DNS, DHCP, and email systems like Microsoft Exchange or Microsoft 365. They ensure all endpoints—employee laptops, desktops, and mobile devices—are properly configured, updated, and secure, frequently using tools like Microsoft Intune or Jamf. System Administrators also implement robust backup solutions, conduct disaster recovery tests, and apply security patches and updates to protect against vulnerabilities. They provide escalated technical support, troubleshoot complex system issues, and create detailed documentation for system configurations and procedures. The skill set for these jobs is both broad and deep. Foundational knowledge of operating systems is paramount, with expertise in Windows Server and/or Linux distributions being highly common. Understanding core networking concepts (TCP/IP, routing, firewalls) and security principles (access controls, hardening, compliance frameworks) is non-negotiable. Proficiency in scripting with PowerShell, Bash, or Python to automate repetitive tasks is a major asset that increases efficiency. Strong analytical and problem-solving skills are essential for diagnosing system failures or performance bottlenecks. Equally important are soft skills: clear communication to assist colleagues and document processes, meticulous attention to detail, and the ability to manage multiple priorities in a high-pressure environment. Typical requirements for IT System Administrator jobs often include a bachelor’s degree in computer science, information technology, or a related field, though relevant experience and professional certifications can be equally valuable. Certifications such as Microsoft Certified: Azure Administrator Associate, CompTIA Server+, CompTIA Security+, Red Hat Certified System Administrator (RHCSA), or VMware Certified Professional (VCP) are frequently sought by employers. A successful candidate is typically proactive, eager to learn new technologies as the IT landscape evolves, and committed to maintaining system uptime and security. For those passionate about building stable, efficient, and secure digital infrastructures, pursuing IT System Administrator jobs offers a stable career with continuous growth and challenge. It is a role where technical skill directly translates into organizational success, making these professionals indispensable in every sector of the economy.

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