Senior OT Systems Engineer: IT/OT Integration Lead

CRH; Atlanta (GA); Hybrid; USD 120,000 - 145,000; Full time

Benefits offered by this job

401(k) plan

Disability benefits

Life insurance

Health, dental, and vision

Paid time off

Paid holidays

Bonus

Job summary

CRH Americas Building Products is seeking a Senior OT Systems Engineer to design, standardize, secure, and lifecycle-manage plant-floor OT infrastructure and its integration with enterprise IT systems. The role focuses on reliable connectivity, security, and uptime for manufacturing operations across sites.

The position bridges IT and plant engineering, ensuring consistent OT environments, aligning with ISA-95 / Purdue models, and prioritizing cybersecurity in manufacturing settings.

Qualifications

• 7+ years of experience supporting OT or manufacturing IT environments.
• Bachelor’s degree in Information Technology, Engineering, or equivalent experience.
• Strong understanding of industrial control systems (PLC, SCADA, HMI).
• Experience with OT networking concepts and protocols (Ethernet/IP, Modbus, OPC).
• Hands-on experience with firewalls, switches, network segmentation, and secure remote access.
• Familiarity with Inductive Automation Ignition and OT Security platforms a plus
• Familiarity with historians, MES, and OT data integrations.
• Operational experience with on-prem server virtualization and cloud computing platforms.
• Working knowledge of OT cybersecurity principles and IT governance processes.

Responsibilities

• Design, implement, and support standardized integration between OT systems (PLC, SCADA, HMI) and IT platforms (MES, historians, ERP interfaces).
• Establish and maintain reference architectures aligned with ISA-95 / Purdue Model.
• Drive consistency across manufacturing sites by defining OT integration standards, patterns, and approved technologies.
• Support plant initiatives requiring data exchange between production systems and enterprise applications.
• Partner with IT infrastructure teams to design and support OT network connectivity, including segmentation, firewalls, and DMZs.
• Ensure OT environments align with corporate IT standards for networking, identity, logging, backup, and monitoring.
• Support secure remote access solutions for vendors and plant support teams.
• Implement and maintain OT cybersecurity controls in alignment with IT security policies and industry standards (IEC 62443, NIST).
• Participate in OT risk assessments, vulnerability remediation, and audit activities.
• Ensure changes to OT environments follow IT change management and approval processes.
• Provide senior-level support for OT integration issues impacting plant operations.
• Lead root-cause analysis and corrective actions for recurring integration or connectivity issues.
• Support lifecycle management of OT infrastructure including hardware refreshes, software upgrades, and vendor end-of-support planning.
• Develop and maintain OT integration documentation, standards, and procedures.
• Enforce governance for OT connectivity, data flows, and third-party access.
• Review and approve system integrator and vendor designs to ensure alignment with IT standards.
• Act as the primary IT point of contact for OT integration at assigned manufacturing sites.
• Collaborate closely with plant engineering, automation, and maintenance teams.
• Mentor junior IT/OT engineers and support knowledge transfer across sites.

Skills

OT/IT integration

Industrial control systems

OT networking

Firewalls

Secure remote access

Ignition

OT security

IT governance

Cloud computing

Education

Bachelor’s degree in IT/Engineering

Tools

Inductive Automation Ignition

OT Security platforms

Job description

CRH Americas Building Products is seeking a Senior OT Systems Engineer to design, standardize, secure, and lifecycle-manage plant-floor OT infrastructure and its integration with enterprise IT systems. The role focuses on reliable connectivity, security, and uptime for manufacturing operations across sites.

The position bridges IT and plant engineering, ensuring consistent OT environments, aligning with ISA-95 / Purdue models, and prioritizing cybersecurity in manufacturing settings.