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As the Senior Automation Software PLC Engineer \u2013 Critical Infrastructure, you'll architect high-availability PLC systems, lead Level 2\u20135 commissioning, and push the boundaries of automation under live pressure. This is a hands-on, high-impact engineering role based in Atlanta, GA, where precision, speed, and resilience define success.

Position Title: Senior Automation Software PLC Engineer \u2013 Critical Infrastructure

Position Location: Must relocate to or live in Atlanta, GA area

SALARY

Smart Tech Contracting recognizes salary ranges from job boards do not necessarily reflect our pay ranges. In many instances we out-compete those ranges for well-qualified candidates.

JOB SUMMARY

The Senior Automation Software PLC Engineer \u2013 Critical Infrastructure owns the complete PLC software life\u2011cycle for hyperscale and colocation data\u2011center campuses ranging from 10\u202FMW to 200\u202FMW+. You will architect, program, and lead level 2/3/4/5 commissioning of high\u2011availability PLC solutions that integrate mechanical, electrical, and IT/OT subsystems\u2014ensuring Tier\u202FIII/IV reliability while meeting aggressive speed\u2011to\u2011market schedules.

The Senior Automation Software PLC Engineer \u2013 Critical Infrastructure will serve as the PLC subject\u2011matter expert (and secondary SME on SCADA development and SCADA integration) to ensure seamless hand\u2011offs, tag mapping, and site testing. You will Lead development of PLC logic, modular function blocks, state machines, and fault\u2011tolerant control strategies across multiple projects.

The Senior Automation Software PLC Engineer \u2013 Critical Infrastructure will coordinate closely with field electricians, startup & commissioning technicians, and the SCADA Engineer to validate end\u2011to\u2011end data flow, alarms, and historian points. You will provide on\u2011site SME support during Level\u202F2\u202Fthrough\u202FLevel\u202F5 Integrated Systems Testing (IST), troubleshooting complex field issues undergo live pressure. You will Implement robust code\u2011management, simulation, and cybersecurity practices aligned with ISA/IEC\u202F62443 and owner standards.

The Senior Automation Software PLC Engineer \u2013 Critical Infrastructure will be self-directed on day-to-day work and independently performs most responsibilities. Will lead teams and projects or tasks of complex scope and broader programs. Will coordinate activities of other personnel. Assists in the development of policies and procedures.

This person will communicate and operate in line with organizational goals and values, as well as departmental objectives.

ESSENTIAL FUNCTIONS

PLC Software Development and Testing (65%)

• Design, program, and debug PLC logic for chilled\u2011water plants, HVAC, CRAH/CRACs, fan wall systems, and liquid cooling solutions

• Build reusable library objects and automated test harnesses; perform Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT)

• Execute Level\u202F2 & 3 panel checkout and Level\u202F4 functional testing; generate corrective patches during Level\u202F5 IST.

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Integration and Commissioning Support (20%)

• Collaborate with SCADA Engineer to develop tag maps and naming conventions; configure BACnet/IP, Modbus\u202FTCP, OPC\u2011UA, and SNMP interfaces

• Support OT network validation (VLAN segmentation, redundant rings) and coordinate with owner IT for secure connectivity

• Guide field & commissioning technicians on sequencing, test scripts, and punch\u2011list resolution.

Standards and Continuous Improvement (10%)

• Maintain and evolve STC global PLC code standards, cybersecurity hardening checklists, and simulation workflows

• Evaluate emerging PLC platforms and developer toolchains to improve build velocity and quality.

Mentorship and Reporting (5%)

• Mentor junior programmers and apprentices; deliver knowledge\u2011transfer workshops for owner operations teams

• Manage team issues and KPI dashboards for internal and client reporting and continuous improvement

Completion of Assigned Tasks and Deliverables on Time and on Budget

Performs Other Related Duties as Assigned

Requirements

POSITION REQUIREMENTS (ADVANCED LEVEL FOR ALL THE FOLLOWING)

• Technical Mastery: 10+\u202Fyrs hands\u2011on programming with Allen\u2011Bradley ControlLogix/CompactLogix

• Application experience: Demonstrated HVAC and / or process systems including chilled water plants and temperature, pressure and flow control implementation.

• Protocol Fluency: BACnet/IP, Modbus\u202FRTU, Modbus TCP, OPC\u2011UA, SNMP, MQTT, RESTful APIs.

• Hyperscale Experience: Documented role on \u226550\u202FMW data\u2011center builds or other 24×7 mission\u2011critical mega\u2011projects (pharma, semiconductor fab, LNG, aerospace, etc.).

• Knowledge of standards & codes: Uptime Tier\u202FIII/IV, NFPA\u202F70E, ISA\u202F88/95, ISA/IEC\u202F62443, UL\u202F508A, IEEE\u202F3004.

• SCADA Familiarity: Working knowledge of Ignition, FactoryTalk\u202FView, AVEVA or VTScada for tag integration and testing (development performed by separate SCADA resource).

• Knowledge of VLANs, LANs, VPNs and RSTP

• Knowledge of IoT and smart building solutions

• Skilled in utilizing toolchains - Studio\u202F5000 Logix Designer, TIA Portal, Codesys, PLC\u202Fsimulators, Git/GitLab, Jira, Wireshark.

• Skilled in client\u2011facing communication, rapid decision\u2011making, and calm execution in schedule\u2011compressed environments.

• Skilled at using MS Office Suite (Excel, Word, Outlook, PowerPoint, Teams), along with exceptional organizational skills for file management

• Skilled in completing assignments accurately and with attention to detail

• Ability to leverage AI and emerging technologies to streamline workflows, optimize operational processes, and contribute to company-wide innovation

• Ability to work successfully in a remote environment thru effective communication and organizational skills, self-motivation, proactiveness and resourcefulness in a distraction free workspace

• Ability to follow company and site safety requirements

• Ability to analyze and prepare documents, reports and correspondence

• Ability to effectively plan and delegate the work of others

• Ability to achieve certification for NFPA70E and / or OSHA training as / if required

• Organizational skills, with the ability to manage multiple tasks simultaneously

PHYSICAL DEMANDS

The following physical demands must be met by the employee to successfully perform the essential functions of this job. Reasonable accommodation may be made to enable individuals with disabilities to perform the essential functions.

While performing the duties of this job, the employee is

• Frequently manipulating, moving or grasping small parts, devices or tools

• Frequently required to remain in a stationary position

• Frequently moving through office, critical facility and other environments (such as low temperatures, high temperatures and outdoor elements such as precipitation and wind), including tight and confined spaces

• Frequently descending / ascending stairs and ladders to access equipment

• On occasion the employee may be required to position self under or over equipment

• On occasion the employee may move equipment weighing up to 50 pounds

TRAVEL / RELOCATION REQUIREMENTS

• Up to 10%; this may include travel to any or all 50 US states

• Must relocate to or be in Atlanta, GA

• Effective May 7, 2025, and in accordance with U.S. federal regulations for domestic air travel, a valid REAL ID (or an acceptable alternative, such as a passport) is required for travel associated with this position.

• Travel may involve transportation by car or plane depending on the destination and nature of the business need.

• Travel is defined as physically leaving home on behalf of business activities including but not limited to client sites, meetings with other employees, meetings for business development purposes, running errands on behalf of the business, attending industry conferences, etc.

EDUCATION / EXPERIENCE REQUIREMENTS

• Bachelor's degree in Engineering, Computer Science, Mechatronics, or related discipline

OR

• Two years of additional experience in related field in lieu of degree

PLUS

• 13+\u202Fyears direct PLC programming experience with at least 4\u202Fyears commissioning/IST leadership on mission critical facilities.

• 10+\u202Fyrs hands\u2011on programming with Allen\u2011Bradley ControlLogix/CompactLogix

Benefits

Smart Tech Contracting offers a very competitive benefits package; highlights include

• Choice of comprehensive medical plans (including two PPO-style plans and a HDHP w/ HSA option)

• Dental and vision plans

• Comprehensive medical, dental and vision benefits extended to spouse / domestic partner and dependent children up to age 26

• 401k with company match and self-directed brokerage account option

• PTO including additional paid time off during the last week of the year

• Company paid life insurance coverage for employees and their eligible dependents

• Short and long-term disability, AD&D coverage

• Professional development opportunities, tuition reimbursement and professional licensing assistance

• Paid parental leave after one year of employment

Smart Tech Contracting is an EEO/Affirmative Action Employer and participates in the E-Verify program with the Department of Homeland Security. We encourage diversity in our workforce.

Are you ready to challenge yourself and redefine standards in the AEC industry? Apply now and join our award-winning team!

NOTICE TO THIRD PARTY AGENCIES:

STC does not accept unsolicited resumes from recruiters, employment agencies, or other staffing services. Unsolicited resumes include any resume or hiring document sent to STC in the absence of a signed Service Agreement where STC has expressly requested recruitment/staffing services specific to the position at hand. Any unsolicited resumes, including those submitted to hiring managers or other business leaders, will become the property of STC and STC will have the right to hire that candidate without reservation \u2013 no fee or other compensation will be owed or paid to the recruiter, employment agency, or other staffing service.