System Administrator (Control Systems) – L3

Colaberry; Dallas (TX); On-site; USD 90,000 - 120,000; Full time

Job summary

Oncor seeks an experienced System Administrator (Control Systems) to ensure real-time operation of control system environments. The role demands expertise in Windows Server and Linux, virtualization, and Nutanix/VMware platforms, with a focus on security, compliance, and resilience.

The ideal candidate will handle on-call rotation, coordinate with OT and IT teams, and maintain high availability for critical infrastructure in a fast-paced utility setting.

Qualifications

• 8+ years of experience in technology areas relevant to control systems and IT operations.
• Expertise with Windows Server, Linux, virtualization, and data center hardware.
• Knowledge of NERC CIP regulatory requirements and best practices.
• Ability to quickly diagnose issues, mitigate risks and analyze dependencies.

Responsibilities

• Manage and administer Windows (2012–2025) and Linux (RHEL) servers.
• Support virtualization, provisioning, maintenance, and security compliance.
• Maintain Nutanix/VMware VDI environments and server lifecycle.
• Apply security patches and updates using SCCM and Satellite servers.
• Provide tier-3 engineering support and participate in on-call rotation.
• Collaborate with cross-functional teams supporting control system tools.

Skills

Windows Server administration

Linux (RHEL)

VMware

Nutanix Prism

PowerShell scripting

Active Directory

DNS/DHCP

Security compliance (NERC CIP)

SCCM/Redhat Satellite

On-call rotation

Tools

Nutanix Prism Central

VMware vSphere

Horizon View

Microsoft SCCM

Red Hat Satellite

Active Directory management

Job description

System Administrator (Control Systems) – L3

This position requires a resource with at least 8 years of experience in the given technology areas. The key competencies include subject matter expertise and system administrator experience with Microsoft Windows OS, VMWare, Linux OS and Nutanix Technologies. Knowledge around the support of operations technology or control system environments is preferred. The candidate should also be able to quickly understand and resolve issues, mitigate risks and analyze dependencies. Finally, this role must adhere to utility industry regulatory requirements and best practices, and guidelines to ensure real-time operation of Oncor’s Control Systems environments remains available 24/7.

Essential Skills and Competencies:

• Manage and administer Windows (2012, 2016, 2019, 2022 and 2025) and Linux (RHEL 7.X, 8.X and 9.X) servers
• Support and manage server virtualization, server provisioning, physical server maintenance, security compliance and the daily operation of the control system environments
• Maintain the physical server lifecycle including provisioning, maintenance, and decommissioning of the hardware
• Maintain the virtualized server environment via configuration, implementation, management and support activities
• Maintain the Nutanix and VMware VDI environment via configuration, implementation, management and support activities
• Maintain security baseline compliance via configuration, implementation, and remediation activities; report on compliance via routine compliance and audit tasks
• Monitor the server infrastructure environment health status, service performance, and utilization; report on trends and anomalies
• Implement and maintain continuous compliance to information security policies, North American Electric Reliability Corporation (NERC) Critical Infrastructure Protection (CIP), and technical standards; report and provide remediation around non-compliances
• Apply regular security patches and software updates using Microsoft SCCM and Redhat Satellite server
• Provide tier-3 engineering support as well as business continuity support for control system infrastructure
• Collaborates with application, network, security and functional team that support Control System tools and applications
• Participates in on call Control System support rotation cycle

Technical Skill Requirement

• Core experience in Windows, Active Directory, Nutanix Prism Central, VMware vSphere and vRealize Suite, vRealize Automation (vRA), vRealize Orchestrator (vRO), Horizon View administration, and Linux in a global and heterogeneous environment
• Good Understanding of Virtualization technology (Nutanix, Hyper-V and VMware)
• Good hands-on experience in diagnostics and troubleshooting of above-mentioned technologies and product suites
• Good understanding of highly available and disaster recovery environments
• Experience in performance tuning of Nutanix, VMware servers and Virtual sessions and management of server resources for both physical as well as between virtual machines
• Experience and expertise on Active Directory, DNS, DHCP, IIS, ADFS, Group Policies, and FTP & SFTP
• Ability to implement AD infrastructure. Proficient in doing Recovery of AD Domain Controllers, DNS, WINS, DHCP servers
• In-Depth knowledge of Domain Controller replication configurations
• Good Exposure to Group Policies creation, their testing and implementation
• Should have good knowledge and troubleshooting skills on MS clusters and load balancing
• Strong in file and print server management; knowledge in Windows Security
• Excellent in PowerShell scripting and task automation work with measurable outputs and operational efficiencies
• Overall knowledge and understanding of data center environments, physical hardware placements, racking, cabling, etc.
• Good at dealing with hardware and OEM vendors for support and troubleshooting purpose for hardware break fix and large platform/server upgrades/migration is required
• Good at dealing and coordinating with multiple teams and stakeholders within the support structure, in order to run daily operations smoothly
• Should have good working experience on RAID management and array controller
• Should have expertise in backup products and expertise in protocol suite and command line utilities
• Should have worked with OEM hardware (DELL/HP), and remote connectivity tools
• Proficiency in system fault tolerance design, business continuity and disaster recovery planning

Prior experience working in Operations Technology or Control System environments is preferred