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# Linux Systems Administrator

- **Company:** Robert Half
- **Location:** Milwaukee, WI, United States
- **Experience:** Expert
- **Contract:** Temporary contract
- **Skills:** Microsoft Windows, Active Directory, Amazon Web Services, Apache Tomcat, Microsoft Azure, Backup Devices, Bash Shell, Business Software, Cloud Computing, Databases, Dynamic Host Configuration Protocol, Linux, Disaster Recovery, Domain Name System (DNS), Web Servers, Internet Information Services (IIS), Virtual Private Networks (VPN), Python (Programming Language), Microsoft Software, Microsoft SQL Server, Windows Servers, Networking Basics, Citrix Systems, Performance Tuning, Windows PowerShell, Remote Desktop Services, Ansible, Software Deployment, TCP/IP, Virtualization Technology, Software Vulnerability Management, Scripting, Google Cloud, Cloud Platform System, Firewalls (Computer Science), Infrastructure Automation Frameworks, Patch Management, Data Management, Terraform, Vmware
- **Published:** October 22, 2026
- **Apply:** https://dejobs.org/x/x/1CF8F1E9017B4B72A979281E1DC8CC95/job/

## About the Role

* 5+ years of hands-on systems administration experience in enterprise, managed services, hosting, or similarly complex environments.
 * Strong experience supporting both Linux and Windows systems.
 * Deep understanding of Active Directory, Group Policy, server lifecycle management, patching, permissions, and troubleshooting.
 * Experience with VMware or other enterprise virtualization technologies.
 * Knowledge of networking fundamentals including TCP/IP, DNS, DHCP, VPNs, and firewall concepts.
 * Experience with scripting and automation using PowerShell plus at least one additional automation or scripting technology.
 * Familiarity with application and web server technologies such as IIS, Tomcat, or similar platforms.
 * Strong communication skills with the ability to explain technical concepts to both technical and non-technical audiences.
 * Ability to manage multiple priorities, work independently, and drive issues through resolution.

Nice to Have

 * Experience with Azure, AWS, or Google Cloud.
 * Exposure to Citrix, Remote Desktop Services, or other application delivery platforms.
 * Experience supporting SQL Server or other enterprise database platforms.
 * Knowledge of backup, disaster recovery, and enterprise storage technologies.
 * Familiarity with infrastructure-as-code and configuration management tools.
 * Relevant certifications in Microsoft, VMware, Linux, cloud, or security technologies.
Technology Doesn't Change the World, People Do.®

## Description

Robert Half is seeking a Senior Systems Administrator to support and maintain a complex mix of Linux, Windows, virtualization, cloud, and application environments. This role is ideal for someone who enjoys working across a broad technology stack, solving challenging infrastructure issues, and partnering directly with both internal stakeholders and external customers.

You'll play a key role in system administration, automation, application support, security, performance optimization, and infrastructure projects while helping ensure highly available and secure business-critical environments.

What You'll Do

 * Administer and support Linux and Windows server environments, including installation, configuration, patching, upgrades, troubleshooting, and performance tuning.
 * Manage core infrastructure services such as Active Directory, Group Policy, IIS, DNS, and related technologies.
 * Support business applications and the underlying infrastructure required to keep them running efficiently.
 * Maintain and troubleshoot virtualized environments, including VMware and similar platforms.
 * Assist with cloud-based infrastructure across Azure, AWS, and other public cloud environments.
 * Develop and maintain automation using tools such as PowerShell, Bash, Python, Ansible, or Terraform.
 * Monitor system health, performance, and capacity while proactively identifying opportunities for improvement.
 * Partner with security teams to implement system hardening, vulnerability remediation, access controls, and patch management best practices.
 * Support backup, recovery, and disaster recovery processes for critical systems and applications.
 * Troubleshoot networking and application connectivity issues involving DNS, DHCP, VPNs, firewalls, and TCP/IP.
 * Participate in infrastructure upgrades, migrations, onboarding efforts, and technology modernization initiatives.
 * Create and maintain technical documentation, procedures, and operational runbooks.
 * Serve as a senior technical resource during incidents, projects, and customer-facing engagements.
 * Participate in an on-call rotation supporting production systems as needed.