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.Commissioning EngineerField Engineer / Systems Integrator — Mission-Critical Power & Energy StorageLocation: Field-Based / Remote in United States (with travel to active project sites)Travel Requirement: >80%Position Type: Full-Time, Salaried + per diem eligible while travelingReports To: Senior Commissioning EngineerON.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.OverviewON.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 ResponsibilitiesCommissioning & TestingExecute 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 LeadershipManage 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 IntegrationReview 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 & QualityFoster 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 Qualifications3–6 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 QualificationsHands-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 SkillsTechnically 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 GetCompetitive 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 RolesProfessional 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.For US-based Roles - What You’ll GetCompetitive salary + annual performance-based bonus eligibilityMedical, dental, and vision insurance401(k) with company matchPaid time off and company holidays For Mexico-based Roles - What You’ll GetCompetitive salary + annual performance bonus eligibilityChristmas Bonus (Aguinaldo): 30 daysMajor medical expenses and life insurancePaid time off and holidays (per local policy)For All RolesProfessional development and growth opportunitiesOpportunity to grow with a mission-driven team shaping the future of clean energyEqual 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@onenergystorage.comBenefits vary by role and location and are subject to change.