Senior OT Systems Engineer: Plant IT/OT Integration Leader

Oldcastle-Infrastructure; Atlanta (GA); Remote; USD 120,000 - 145,000; Full time

Benefits offered by this job

401(k) plan

Disability insurance

Health, dental, and vision insurance

Paid time off

Paid holidays

Job summary

CRH Americas Building Products seeks a Senior OT Systems Engineer to design, standardize, secure, and manage lifecycle for plant-floor OT infrastructure integrated with enterprise IT. You will bridge IT and plant engineering to ensure uptime, safety, and cybersecurity across manufacturing sites.

Remote role based out of Atlanta, GA, reporting to IT; lead OT integration projects, drive reference architectures, and collaborate with engineering, automation, and maintenance teams to enable reliable

Qualifications

• Bachelor’s degree in Information Technology, Engineering, or equivalent experience.
• 7+ years of experience supporting OT or manufacturing IT environments.
• Demonstrated experience working within an IT organization supporting plant‑floor systems.
• 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.
• Experience with Inductive Automation Ignition and OT Security platforms a plus
• Familiarity with historians, MES, and OT data integrations.

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

ISA-95

Purdue Model

Industrial OT security

Networking fundamentals

Firewall management

Ignition (Inductive Automation)

OT data integrations

Cloud/edge computing

Education

Bachelor’s degree in Information Technology or Engineering

Tools

Inductive Automation Ignition

Job description

CRH Americas Building Products seeks a Senior OT Systems Engineer to design, standardize, secure, and manage lifecycle for plant-floor OT infrastructure integrated with enterprise IT. You will bridge IT and plant engineering to ensure uptime, safety, and cybersecurity across manufacturing sites.

Remote role based out of Atlanta, GA, reporting to IT; lead OT integration projects, drive reference architectures, and collaborate with engineering, automation, and maintenance teams to enable reliable