Commissioning engineer

Commissioning Engineer — Mechanical/Chiller Focus

Location: Montgomery, Alabama

Engagement: W2 long-term contract with a contract-to-hire path for strong performers

Position Summary

Support startup, testing, and commissioning of mechanical systems on large-scale data center construction projects. Working on site with engineering leads and trade partners, this role troubleshoots chillers, valves, rooftop units, fan arrays, PLC controls, hard-wired inputs and outputs, and Modbus communications through point-to-point Level 3 testing and turnover.

Key Responsibilities

• Commission and troubleshoot chillers, valve systems, rooftop units, fan arrays, and associated controls.
• Perform point-to-point Level 3 testing and verify hard-wired IO from field devices back to control panels.
• Diagnose PLC and Modbus issues; retrieve programs, make supervised edits, and download revised logic.
• Document deficiencies, confirm corrective work, and support safe, standards-based system turnover.
• Coordinate daily with commissioning leads, controls engineers, vendors, and site teams.

Required Qualifications

• Mid-level to senior experience in mechanical commissioning, HVAC controls, industrial controls, or mission-critical facilities.
• Demonstrated chiller startup, staging, and troubleshooting depth.
• Hands-on PLC troubleshooting and electrical print-reading ability; Schneider experience is preferred, while Rockwell/Allen-Bradley or Siemens experience transfers well.
• Experience with hard-wired IO checkout and register-level Modbus troubleshooting.
• HVAC controls technicians with strong chiller depth may qualify alongside degreed engineers.

Work Requirements

This is an on-site role, Monday through Friday, beginning at 7:00 AM, with typical active-site weeks of approximately 45 hours. Candidates must commit to relocation or full-week travel; partial-week, remote, and hybrid arrangements are not available.