OT Systems Integration Engineer (BAS/HVAC Focus)

The Select Group; Exton (PA); Hybrid; USD 120,000 - 150,000; Full time

Job summary

The Select Group is seeking an OT Systems Integration Engineer to design and implement VBAS automation logic at mission critical facilities. You will build stage-up/down sequences triggered by thermal and electrical thresholds, and integrate with HVAC controllers from Eaton, Siemens, Liebert (Vertiv), and others.

Remote role with occasional onsite work in Downingtown, PA. Required: 5+ years in HVAC controls or building automation, hands-on experience with BACnet, Modbus, OPC-UA, and BAS

Qualifications

• 5+ years in HVAC controls engineering or building automation systems integration.
• Programming experience with industrial protocols and automation logic design for BAS platforms.
• Experience with BACnet/IP, BACnet MS/TP, Modbus TCP/RTU, OPC-UA or LON.
• Knowledge of ASHRAE A2 thermal environment specs for data centers or critical facilities.
• Field commissioning on live facilities and on-site interpretation of drawings and control docs.
• Familiarity with edge gateway concepts and AWS IoT Greengrass/SiteWise for industrial apps.

Responsibilities

• Design and develop automation logic programs based on ASHRAE A2 thresholds and load signals.
• Create integration programs connecting control logic to HVAC interfaces using BACnet/IP, Modbus, OPC-UA or vendor APIs.
• Deploy AWS IoT Greengrass v2 components for protocol translation and local buffering.
• Configure AWS IoT SiteWise Edge gateway programs to collect facility telemetry.
• Develop safety interlock, override, and alert escalation features.
• Support POC execution at pilot sites with vendor teams and document outputs.
• Coordinate with Eaton, Siemens, Liebert and Foreseer for system access and validation.
• Produce specifications, diagrams and commissioning documentation.

Skills

HVAC controls

Industrial protocols

Automation logic

BAS platforms

ASHRAE A2

Field commissioning

Edge gateway

Python scripting

Vendor API integration

Tools

Metasys

Desigo CC

EcoStruxure

Foreseer

AWS IoT Greengrass

AWS IoT SiteWise

Job description

OT SYSTEMS INTEGRATION ENGINEER (BAS / HVAC)

The Select Group is seeking an OT Systems Integration Engineer to support one of our top communications clients in designing and implementing the Virtual Building Automation System (VBAS) automation logic at their mission critical facilities. This resource will build the stage-up and stage-down automation sequences that respond to thermal and electrical threshold triggers, integrate with existing HVAC controller interfaces from Eaton, Siemens, Liebert (Vertiv), and other vendors, and implement the safety interlock and manual override framework. This is primarily a remote opportunity that will require occasional onsite work as needed in Downingtown, PA.

What You’ll Bring

• 5+ years in HVAC controls engineering or building automation systems integration.
• Programming experience with industrial protocols. Hands-on experience designing programs that integrate via BACnet/IP, BACnet MS/TP, Modbus TCP, Modbus RTU, OPC-UA, or LON (read and write configuration).
• Automation logic programming. Experience designing, developing, and modifying automation logic programs in BAS platforms: Johnson Controls Metasys, Siemens Desigo CC, Schneider EcoStruxure, Honeywell, or equivalent.
• Knowledge of ASHRAE A2 thermal environment specifications for data centers or critical facilities.
• Field commissioning experience — must be comfortable on-site at live operating facilities.
• Ability to interpret HVAC drawings, sequence of operations, and control panel documentation.
• Edge gateway programming. Familiarity with edge gateway concepts; AWS IoT Greengrass v2 component program experience preferred (willingness to adopt is acceptable).

Bonus Experience

• Experience with co-location, telecom headend, or hyperscaler datacenter facility environments.
• Familiarity with AWS IoT SiteWise Edge or equivalent industrial cloud gateway programs.
• Experience designing programs for AI/ML-driven automation platforms or predictive control systems.
• Familiarity with Eaton Foreseer or vendor-specific monitoring platforms in the Comcast footprint.
• Python programming for automation logic test programs or API integration programs.
• Knowledge of NIST SP 800-82 (Operational Technology security) or Purdue Model network segmentation.
• Certified Control Systems Technician (CCST) or equivalent credential.
• Experience with containment systems: hot-aisle/cold-aisle containment, in-row cooling.

What You’ll Do

• Automation logic program design and development. Apply systems analysis techniques to determine functional specifications; design, develop, document, test, and modify stage-up and stage-down automation logic programs based on ASHRAE A2 thermal thresholds and electrical load signals.
• Integration program development. Design and modify integration programs connecting the automation control logic with existing HVAC controller interfaces using BACnet/IP (primary), BACnet MS/TP (legacy serial), Modbus TCP/RTU, OPC-UA (preferred for newer systems), or vendor-specific APIs from Eaton, Siemens, Liebert, and Foreseer.
• Edge component program deployment. Design, develop, document, deploy, and modify AWS IoT Greengrass v2 component programs at site for protocol translation and local buffering during connectivity loss.
• SiteWise Edge gateway configuration program. Design and modify AWS IoT SiteWise Edge gateway configuration programs to consume facility telemetry via BACnet, Modbus, and OPC-UA connectors.
• Safety interlock program implementation. Design, develop, test, and modify safety interlock programs: manual override capability, minimum cycle time enforcement, alert escalation, override audit trail.
• POC execution and program validation. Execute the HVAC Automation POC at the two Downingtown pilot sites in Recommend Mode with the Comcast facilities team supervising every recommendation; analyze program output and modify automation programs based on operator feedback.
• POC results analysis and documentation. Document POC results: response latency, setpoint accuracy, false-positive rate, operator feedback, PUE and EPCB outcome metrics against pre-POC baseline.
• Automation sequence validation. Validate automation sequence programs against Comcast-approved operating parameters; coordinate vendor support engagements (Eaton, Siemens, Liebert) where controller access requires vendor configuration.
• Test program collaboration. Support the QA/Integration Analyst during test execution; analyze test results and design corrective program modifications.
• Specification documentation. Produce automation logic program specifications, control flow diagrams, and commission documentation.

TSG 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, disability, or status as a protected veteran.