OT Systems Network Engineer

Enterprise Automation, A Tetra Tech Company

Irvine (CA)

On-site

USD 110,000 - 140,000

Full time

15 hours ago

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Job summary

Enterprise Automation, a Tetra Tech company, seeks an experienced OT Systems Engineer to design, review, and troubleshoot OT solutions in complex industrial environments. You will contribute to solution development, root cause analysis, and client-facing support, serving as a subject matter resource for OT best practices and risk reduction.

You will deliver network drawings, firewall rules, VM specs, and AD/GP configurations while collaborating on multi-project engagements.

Qualifications

Experience in OT/ICS environments and industrial networking.
Strong troubleshooting in OT/ICS and security practices.
Client-facing roles with clear documentation and guidance.
Familiarity with Windows Server, virtualization, and networks.
Knowledge of CISSP/GICSP/CISA/VCP certifications is preferred.

Responsibilities

Design, review, implement, and commission OT engineering solutions for client projects.
Provide technical leadership on OT tech, networks, automation, and cybersecurity.
Troubleshoot networking, firewall, OS, and virtualization issues; support RCAs.
Evaluate options balancing performance, security, and maintainability; specify BOMs.
Support OT cybersecurity best practices and risk reduction.
Assist with OT investigations, upgrades, and integration efforts.
Develop OT docs and drawings: network, IP schemes, firewall rules, VMs, AD/GP.
Contribute to discovery, scoping, and solution discussions with clients.

Skills

OT architectures

Industrial networking

OT cybersecurity

Client-facing

Troubleshooting

Windows Server

Virtualization

Linux administration

Visio diagrams

CISSP

GICSP

CISA

VCP

Education

Certifications: CISSP, GICSP, CISA, VCP

Tools

VMware

Hyper-V

Cisco

Fortinet

Palo Alto

Moxa

Hirschmann

AVEVA System Platform

Ignition

VTScada

FactoryTalk View

SQL Server

SSRS

PowerBI

Job description

Who are you?

You are a technically strong, hands-on problem solver who takes ownership and follows through. You thrive in complex industrial environments, where you can apply deep OT knowledge to design, troubleshoot, and improve systems that need to be reliable, secure, and maintainable. You are curious, detail-oriented, and committed to continuously deepening your expertise in operational technology, industrial networking, automation, and OT cybersecurity. You are not just an individual contributor—you are a trusted technical resource. You work well across multiple concurrent projects, communicate clearly with both internal teams and clients, and bring sound judgment to technical decisions. You balance urgency with rigor, and you care about producing high-quality work, strong documentation, and practical solutions that make a real impact.

What is the role?

We're seeking an experienced OT Systems Engineer to support the design, review, implementation, commissioning, and troubleshooting of operational technology solutions across industrial client environments. This role combines technical depth in OT systems, industrial networking, automation platforms, and cybersecurity with hands-on project execution and client-facing support. You'll contribute independently to solution development, root cause analysis, remediation, documentation, and technical discovery. You'll also serve as a subject matter resource for OT best practices and risk reduction, helping clients and internal teams evaluate technical options and implement solutions that improve performance, reliability, and security.

This is an in-office position

What do you get? This role offers the opportunity to work on meaningful, high-impact OT projects in complex industrial environments, where your technical expertise directly supports secure, reliable, and well-designed systems. You'll have the chance to deepen your knowledge across OT architecture, industrial networking, automation, and cybersecurity while working on a variety of client engagements that challenge and expand your skills. You'll be part of a team that values strong technical judgement, ownership, and continuous learning, with the opportunity to grow into broader technical leadership over time. In addition, you'll build trusted relationships with both internal teams and clients, contribute to real-world solutions, and play an important role in improving the performance, resilience, and security of critical operational systems.

What will you do?

Support the design, review, implementation, and commissioning of OT engineering and architecture solutions across multiple concurrent client projects.
Provide technical leadership on OT technologies, industrial networking, automation platforms, and cybersecurity practices. Stay current on each and provide guidance to clients and internal teams on new technologies, emerging trends, and best practices.
Troubleshoot complex networking, firewall, operating system, virtualization, and other general OT issues. Support root cause analysis, remediation, and system optimization.
Evaluate technical options and recommend approaches that balance performance, reliability, security, and maintainability. Specify and develop hardware and software bill of materials.
Serve as a subject matter resource for OT cybersecurity best practices and risk reduction.
Support OT investigations, audits, modernization efforts, upgrades, and integration projects.
Develop and maintain OT technical documentation and drawings, including deliverables such as network drawings, IP address & network segmentation schemes, firewall rules, virtual machine & server specifications, and Active Directory & Group Policy specifications.
Contribute to technical discovery, scoping, and solutioning discussions with clients and internal teams.

What do you need to bring?

Solid experience in operational technology, industrial automation, controls, or systems integration.
Strong technical knowledge of OT architecture, industrial networks, and implementation best practices.
Hands-on experience in client-facing technical roles supporting industrial environments.
Ability to independently analyze problems, identify options, and implement practical solutions.
Strong troubleshooting and diagnostic skills in OT/ICS environments.
Working knowledge of OT cybersecurity concepts, segmentation, remote access, and risk mitigation.
OT cybersecurity tools and practices: asset visibility, remote access, monitoring, and vulnerability management.
Industrial networking: managed switches, routing, VLANs, firewalls, and segmentation using common platforms such as Cisco, Fortinet, Palo Alto, Moxa, and Hirschmann.
Virtualization experience using common platforms such as VMware and Hyper-V.
Windows Server administration experience, including Active Directory, Group Policy, Remote Desktop Services, SQL Server, and WSUS.
Excellent written and verbal communication skills
Strong technical knowledge of control systems.
PLC platforms: Rockwell Automation, Siemens, Schneider Electric
SCADA/HMI platforms: AVEVA System Platform, Inductive Automation Ignition, Trihedral VTScada, Rockwell FactoryTalk View, Siemens WinCC
Historian/data platforms: AVEVA PI, AVEVA Historian, AVEVA Reports, Microsoft SQL Server, SSRS, and PowerBI
Common industrial protocols: EtherNet/IP, Modbus TCP/RTU, Profinet, OPC UA, DNP3, IEC 61850
WAN connectivity: cellular modems, wireless backhaul radios, site to site VPN, SD-WAN.
Linux administration experience.
Diagramming skills in Microsoft Visio.
Certified Information Systems Security Professional (CISSP)
Global Industrial Cybersecurity Professional (GICSP)
Certified Information Systems Auditor (CISA)
VMware Certified Professional (VCP)

Who are we?

Enterprise Automation, a Tetra Tech company, is a leading professional services firm specializing in automation consulting and systems integration. We serve a range of process-driven industries - including water and wastewater, oil and gas, life sciences, materials handling, and energy - with a focus on delivering best-in-class services and solutions. We take pride in an accountability-driven culture and in earning our reputation as a trusted, value-added advisor to clients. Our commitment to people and teamwork has been recognized with Orange County's Best Places to Work award multiple years running, and we hold a 4.9/5.0 rating on Glassdoor by fostering a highly functioning workplace where people matter and enjoy working together.

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