Senior OT Systems Engineer

Oldcastle Infrastructure; Atlanta (GA); Hybrid; USD 110,000 - 150,000; Full time

Benefits offered by this job

Competitive base pay

Medical, dental & disability benefits

Retirement savings plan

Health and wellness programs

Inclusive culture and internal growth

Opportunity for internal promotion

Job summary

The Senior OT Systems Engineer at CRH Americas Building Products will design, standardize, secure, and manage plant-floor OT infrastructure and its integration with enterprise IT systems to ensure reliable manufacturing operations.

This hybrid role based in Atlanta requires collaboration with plant engineering, automation, and maintenance teams, plus mentoring junior IT/OT staff and leading risk assessments and lifecycle management of OT assets.

Qualifications

• Bachelor's degree in Information Technology, Engineering, or equivalent experience.
• 7+ years supporting OT or manufacturing IT environments.
• Experience with PLC, SCADA, and HMI.
• Knowledge of OT networking concepts (Ethernet/IP, Modbus, OPC).
• Familiarity with firewalls, switches, and secure remote access.
• Experience with Ignition by Inductive Automation is a plus.

Responsibilities

• Design, implement, and support standardized OT-IT integration.
• Define architectures aligned with ISA-95 / Purdue.
• Drive OT integration standards across sites.
• Support data exchange between production systems and ERP/MES.
• Collaborate with IT to design OT networks, including DMZs.
• Ensure OT environments meet IT governance and security.
• Provide senior-level troubleshooting for integration issues.
• Lead OT risk assessments and remediation activities.
• Maintain OT infrastructure lifecycle and documentation.
• Mentor junior engineers and share knowledge across sites.

Skills

OT/IT integration

Industrial cybersecurity

ISA-95 / Purdue

OT networking

Root-cause analysis

Mentoring/leadership

Education

Bachelor's degree in Information Technology or Engineering

Tools

Inductive Automation Ignition

OT security platforms

Job description

Job ID: 527416

CRH Americas Building Products is reinventing what's possible in building solutions. We are the leading provider of innovative outdoor living products and utility infrastructure solutions for the water, energy, and communications markets throughout North America. We're a trusted and strategic partner to engineers, contractors, distributors, specifiers, retailers and homeowners alike as the manufacturer of precast concrete, polymer concrete, and plastic infrastructure products. Our portfolio of brands includes Oldcastle APG, Oldcastle Infrastructure, Belgard® hardscape, Echelon® Masonry, RDI® railing, Catalyst™ Fence Solutions, Sakrete® packaged concrete, Amerimix® mortar, Pebble Technology International® pool finishes, and Techniseal® sands and sealant technologies.

Job Summary

The Senior OT Systems Engineer is responsible for the design, standardization, security, lifecycle management, and operational reliability of plant-floor OT infrastructure and its integration with enterprise IT systems. This role sits within the IT organization and focuses on ensuring reliable connectivity, security, and lifecycle management of industrial systems that support manufacturing operations.

Job Location

This is a hybrid role based at our Corporate Office in Atlanta, GA.

Job 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.

Job Requirements

• 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.
• Hands-on experience with plant floor Industrial PCs, servers, workstations, scanners, tablets, label printers, laser printers, etc.
• Operational experience with on-prem server virtualization and cloud computing platforms.
• Working knowledge of OT cybersecurity principles and IT governance processes.

What CRH Offers You

• Highly competitive base pay
• Comprehensive medical, dental and disability benefits programs
• Group retirement savings program
• Health and wellness programs
• An inclusive culture that values opportunity for growth, development, and internal promotion

About CRH

CRH has a long and proud heritage. We are a collection of hundreds of family businesses, regional companies and large enterprises that together form the CRH family. CRH operates in a decentralized, diversified structure that allows you to work in a small company environment while having the career opportunities of a large international organization.

CRH Americas Building Products (ABP), a CRH Company, is an affirmative Action and Equal Opportunity Employer.

EOE/Vet/Disability

CRH is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, status as a protected veteran or any other characteristic protected under applicable federal, state, or local law.

AI tools may be used in certain stages of the employment lifecycle, such as candidate review; however, all final employment decisions will be made by a person.