Application System Administrator (Control Systems)

Amtex Enterprises,Inc; Dallas (TX); Hybrid; USD 90,000 - 130,000; Full time

Job summary

Amtex Enterprises Inc. is seeking an experienced Application System Administrator (Control Systems) for a 12+ month contract in Dallas, TX, hybrid work with 3 days in office and occasional travel. Requires 8+ years of expertise in OT/control systems, Windows and Linux administration, scripting, and strong coordination with vendors.

The role supports real-time operations and on-call rotation as needed. The candidate will maintain and upgrade control system applications, develop test strategies,

Qualifications

• Experience maintaining Control System/OT applications.
• Strong knowledge of Windows and Linux server tasks.
• Ability to document changes and communicate risk.
• Experience with outages and change coordination.
• Understanding of compliance standards (CIP, NERC CIP).
• Ability to work with vendors and cross-functional teams.
• Capability to support 24/7 real-time operations.

Responsibilities

• Maintain and upgrade Control System applications.
• Develop and test code updates before production.
• Review change risks and communicate to stakeholders.
• Coordinate outages for maintenance and upgrades.
• Support on-call rotation and incident response.
• Collaborate with OT vendors and internal teams.
• Ensure 24/7 operation of Control Systems.

Skills

Control System admin

Windows Server

Linux (RHEL)

Scripting (Python, PowerShell, Bash)

JSON/XML data structures

Vendors coordination

On-call rotation experience

OT/ICS familiarity

Security & compliance (CIP, NERC CIP)

Tools

Nutanix

Hyper-V

VMware

Active Directory

Git

Job description

Job Title: Application System Administrator (Control Systems)

Duration: 12+ months contract.

Location: Dallas, TX- Hybrid 3 days in office required at Client Place…10% travel around DFW metroplex and will need to be able to support an on-call rotation schedule (not initially, but eventually)

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 Control System / Operations Technologies as well as their underlying infrastructure. This role will provide configuration support, troubleshooting, technical subject matter expertise, and best practices for the ongoing support of Client’s Control System environment(s). 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 Client’s Control Systems environments remains available 24/7.

Essential Skills and Competencies

• Support overall maintenance activities associated with as well as manage the effective implementation of Control System application upgrades, patches, etc.
• Support the development of test strategies and assist in developing and testing code updates prior to implementation on the production system
• Review risks and impacts of system changes and communicate this information to various stakeholders
• Support the coordination of outages due to maintenance, upgrades, and implementations
• Work with client’s Control System / OT vendors and stakeholders to create, update and resolve problem tickets
• Understand Windows (2012, 2016, 2019, 2022 and 2025) and Linux (RHEL 7.X, 8.X and 9.X) operating systems and associated server administration tasks (e.g., virtualization, provision, maintenance, security, etc.)
• Maintain security baseline compliance via configuration, implementation, and remediation activities, report on compliance via routine compliance and audit tasks
• Monitor application and 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
• Provide tier-3 engineering support as well as business continuity support for control system applications
• Collaborate with infrastructure, network, security and functional teams that support Control System environments and tools
• Participates in on call Control System support rotation cycle

Technical Skill Requirement

• Core experience in managing and maintaining Control System / OT applications
• Good understanding of Windows (Server and Workstation), Linux, Active Directory, Utility Communication Protocols (ICCP, DNP3, OPC), and Data Networks
• Good understanding of Virtualization technology (Nutanix, Hyper-V and VMware)
• Good hands-on experience in diagnostics and troubleshooting of above-mentioned technologies
• Good understanding of patching and maintenance best practices in highly available and disaster recovery environments
• Ability to configure and maintain SSL/TLS encrypted communications between EMS components, control center applications, and external systems
• Proficiency in python, powerShell, bash/shell scripting, CALC development, JSON and XML data structures, batch scripting and version control systems (Git)
• Overall knowledge and understanding of data center environments, physical hardware placements, racking, cabling, etc.
• Good at dealing with 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 knowledge of backup products and command line utilities
• Should have worked with 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.