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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. Senior Commissioning Engineer   Project Site Lead — Mission-Critical Power & Energy Storage   Location:  Field-Based / Remote in United States (with travel to active project sites)   Travel Requirement:  ~80%   Position Type:  Full-Time, Hourly (Non-exempt, eligible for OT) + GSA Rate per diem eligible while traveling +  Reports To: Senior  Commissioning Manager   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   The Senior Commissioning Engineer serves as the Project Site Lead, providing overall leadership and technical oversight of the commissioning process for ON.energy’s mission-critical, medium-voltage double-conversion UPS systems built on utility-scale BESS equipment (batteries, transformers, PCS, and controls). Leading site-based teams of 10–50 people from installation through commissioning, acceptance testing, and handover to services, the Senior Commissioning Engineer owns critical-path execution, stakeholder communication, and final commissioning sign-off for the site.   This is a senior, high-travel field leadership role for an engineer with deep BESS and power systems expertise who is equally comfortable leading a large multidisciplinary site team, interpreting a complex test plan, and serving as the customer-facing technical authority on site.   Key Responsibilities   Leadership & Technical Oversight   Provide overall leadership and technical oversight of the commissioning process.   Manage site-based technical teams of 10–50 people from installation through commissioning and acceptance testing, and facilitate smooth handover to services.   Manage site-based workflow in line with critical-path demands, ensuring timely and quality delivery.   Train and mentor junior engineers and technicians.   Stakeholder & Project Management   Act as the primary point of contact between project stakeholders (Project Managers, Project Engineers, Customers, OEMs, and Vendors).   Understand and interpret project-specific task orders, change orders, and MSAs.   Develop and follow commissioning plans, test plans, procedures, and schedules.   Technical Execution & Compliance   Ensure compliance with safety protocols, grid interconnection requirements, and regulatory standards.   Lead root cause analysis (RCA) and high-level troubleshooting for major issues.   Provide final commissioning sign-off and documentation.   Required Qualifications