System Administrator - L3

CTC; Dallas (TX); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Competitive compensation

Job summary

CTC seeks a senior systems administrator with extensive experience in Windows and Linux servers, virtualization (Nutanix/VMware), and control system environments. The role requires rapid diagnostics, risk mitigation, and 24/7 operation support for critical systems.

Ideal candidates will demonstrate deep expertise in Active Directory, DNS/DHCP, and security compliance, with hands-on scripting and automation skills to improve reliability and efficiency across OCI/OT environments.

Qualifications

• 8+ years of experience in Windows, Linux, and virtualization environments.
• Experience with control system environments and 24/7 operation
• Knowledge of NERC CIP and information security basics.

Responsibilities

• Manage and administer Windows and Linux servers in a global environment.
• Maintain Nutanix/VMware VDI and virtualization infrastructure.
• Ensure security baseline compliance and patch management.
• Provide on-call engineering support and incident resolution.

Skills

Windows Server administration

Linux Server administration

Nutanix Prism Central

VMware vSphere

vRealize Suite

AD/DNS/DHCP

Security compliance

Tools

Nutanix Prism Central

VMware vSphere

vRealize Suite

Horizon View

Red Hat Satellite

Microsoft SCCM

Job description

Job Description:

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 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

Team Culture

Our team is fast paced, highly energetic, motivated and hardworking. We expect our candidates to be integrated into our results-driven and solution-oriented culture from the get-go. Our team attains high-quality results on challenging projects; the belief that outcomes are linked to one's effort rather than chance and the tendency to personally set challenging yet realistic goals.