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.
- 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.
