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 DoAdminister 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.