Commissioning Engineer 

Field Engineer / Systems Integrator — Mission-Critical Power & Energy Storage 

Location: Field-Based in United States (with travel to active project sites) 

Travel Requirement: >80% 

Position Type: Full-Time, Hourly (non-exempt, eligible for OT) + per diem eligible while traveling + eligibility for annual short-term incentive bonus (performance based)

Reports To: Senior Commissioning Engineer 

ON.energy is building the power infrastructure that makes the AI era possible. As AI demand surges past what the grid and traditional data centers can support, ON.energy provides a new class of power technology proven at gigawatt scale and trusted by the world’s leading cloud and AI companies. Our systems are already deployed across 2.5 GW of hyper-scale campuses, validated by top U.S. national labs, and certified for grid-safe operation by major utilities. With real products in the field, we’re scaling faster than the grid can, transforming power from a bottleneck into a competitive advantage for the companies building the future. 

Overview 

ON.energy is seeking a Commissioning Engineer (Field Engineer / Systems Integrator) to execute system-level commissioning, lead small on-site teams, and drive project milestones across ON.energy’s mission-critical, medium-voltage double-conversion UPS deployments built on utility-scale and C&I BESS equipment (batteries, transformers, PCS, and controls). Reporting to a Senior Commissioning Engineer, you will be trusted to operate autonomously on-site — managing testing, troubleshooting, and documentation while maintaining the highest standards of safety and quality. 

This is a high-travel, hands-on field role. You will spend the majority of your time on project sites across the U.S. and occasionally internationally. The ideal candidate is technically sharp, highly organized, and comfortable leading a small team in fast-paced construction environments. 

Key Responsibilities 

Commissioning & Testing 

• Execute system-level commissioning tests including functionality checks, network verification, and performance validation for data center, utility-scale, and C&I BESS projects. 

• Support FAT validation and site acceptance testing (SAT) in coordination with OEM and owner engineers. 

• Perform functional testing of inverters, PCS, BMS, EMS/SCADA, protection relays, and associated BOS equipment. 

• Identify, document, and resolve commissioning deficiencies; manage punch lists through to closeout. 

Team & Project Leadership 

• Manage a subset of the on-site commissioning team (2–10 people), autonomously driving project initiatives as directed by the Senior Commissioning Engineer and management team. 

• Coordinate daily with EPC contractors, OEM field service engineers, and the ON.energy project and engineering teams to resolve technical challenges and keep milestones on track. 

• Collaborate with internal and external teams to resolve technical challenges as they arise in the field. 

Controls & Systems Integration 

• Review and validate configurations for PLC, SCADA, EMS, network infrastructure, and related control systems. 

• Conduct troubleshooting for control system issues, network faults, and inverter problems. 

• Verify system configuration against design drawings, specifications, and interconnection requirements. 

• Support integration and testing of SCADA/DMS communications (DNP3, Modbus, etc.) 

Safety & Quality 

• Foster and maintain a culture of safety for all team members on site, owning the Job Hazard Analysis (JHA) and Lockout/Tagout (LOTO) programs. 

• Support safety inspections and risk assessments throughout the commissioning lifecycle. 

• Ensure commissioning activities comply with NFPA 70E, NEC, IEEE, and applicable NERC/FERC standards. 

• Provide field reports and maintain thorough, audit-ready documentation for all commissioning activities. 

Required Qualifications 

• 3–6 years of hands-on commissioning experience on BESS, solar + storage, or utility-scale renewable energy projects. 

• Direct experience with battery storage systems including BMS, PCS/inverter, and EMS/SCADA commissioning. 

• Proficiency reading and interpreting electrical schematics, single-line diagrams, and P&IDs. 

• Working knowledge of protection relay testing, CT/PT verification, and DC/AC high-voltage systems. 

• Strong technical writing skills; ability to produce clear field reports and commissioning documents. 

• Valid driver’s license and US passport 

• Ability to travel >80% of the time. 

Preferred Qualifications 

• Hands-on experience with one or more major BESS OEMs (Tesla Megapack, BYD, CATL, Sungrow, or similar). 

• Familiarity with SCADA communication protocols: DNP3, Modbus TCP/RTU, etc 

• Familiarity with utility interconnection processes (distribution and transmission). 

• NETA, NICET, or relevant electrical certifications. 

• OSHA 10 or OSHA 30 certification; NFPA 70E training. 

• Bachelor’s degree in electrical engineering, Power Systems, or a related technical field (or equivalent field experience). 

Soft Skills 

• Technically sharp, highly organized, and comfortable leading a small team in fast-paced construction environments. 

• Strong communicator across EPC, OEM, and internal stakeholders. 

• Autonomous and accountable. 

• Safety- and quality-first mindset. 

For US-Based Roles — What You’ll Get 

• Competitive base salary + annual performance-based bonus eligibility 

• Medical, dental, and vision insurance 

• 401(k) with company match 

• Paid time off and company holidays 

• Per diem eligibility while traveling to project sites 

For All Roles 

• Professional development and growth opportunities 

• Opportunity to grow with a mission-driven team shaping the future of clean energy 

Equal Opportunity: ON.energy is committed to equal employment opportunity and to maintaining a work environment free of harassment, discrimination, or retaliation. 

Accommodations: If you need an accommodation during the application process, email recruitment@on.energy. 

Benefits vary by role and location and are subject to change. 

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