Principal Test Engineer

ON.energy • Miami, FL

13h • Hybrid

About The Position

ON.energy is setting the standard for large load interconnection. ON’s patented AI UPS™ is a medium-voltage UPS that serves as a firewall, protecting the data center from the grid, and the grid from the data center. With multiple gigawatts currently under construction, we are enabling grid-safe data centers. The Principal Test Engineer will serve as a master in electrical engineering, establishing technical direction, standards, and best practices. This individual will be the facilitator of product development, validation, and de-risking activities. They will be responsible for the end-to-end planning and execution of advanced validation cycles within On’s own and partner facilities. The primary goals are to de-risk On Energy’s current and future product line system architecture through rigorous lab-based stress testing and to bridge the gap between lab results and reality by maintaining and operating lab capabilities to support training, troubleshooting, and customer engagement.

Requirements

• 12+ years of electrical engineering experience, recognized as a domain authority of product development, test validation and de-risking activities in the scope of power systems and grid-tied technologies
• B.S./M.S. in Electrical Engineering, Systems Engineering, or a related field.
• Prior experience testing and modeling grid code compliance of large inverter-based resources.
• Deep understanding of Energy Storage Systems (BESS), Power Electronics (Inverters/Rectifiers), and Grid-Forming technologies.
• Exceptional communication skills—the ability to speak "Research" to NLR scientists and "Deployment" to On Energy field technicians.

Nice To Haves

• Experience working at a National Lab or within the DOE framework is preferred.

Responsibilities

• Serve as the primary technical point of contact for principal investigators and facility managers.
• Design and document detailed test procedures that utilize laboratory Hardware-in-the-Loop (HIL) research assets to validate On Energy’s performance under extreme conditions (e.g., rapid frequency response, grid and load transitions, or grid instability). Synthesize product design criteria, industry standards, and customer requests into detailed workplans.
• Ensure all On Energy hardware and test procedures comply with industry safety standards and local Site Operations protocols.
• Use laboratory controlled environment to identify edge-case failures that are impossible to test in live field environments.
• Analyze high-fidelity data streams from laboratory sensors to provide actionable feedback to the On Energy product and project teams, as well as to On Energy component vendors, for firmware/hardware iterations.
• Report on data collected relative to product requirements and performance criteria for internal and customer review.
• Use the testing phase at NLR as a live training ground for On Energy’s field commissioning staff, familiarizing them with system behavior, diagnostics, and recovery.
• Convert lab-based learnings into field-ready Commissioning SOPs and Troubleshooting Guides.
• Coordinate the rotation of On Energy field technicians through the NLR facility to ensure knowledge transfer is uniform across the commissioning department.

Benefits

• Competitive salary + annual performance-based bonus eligibility
• Medical, dental, and vision insurance
• 401(k) with company match
• Paid time off and company holidays
• Professional development and growth opportunities
• Opportunity to grow with a mission-driven team shaping the future of clean energy
• Christmas Bonus (Aguinaldo): 30 days
• Major medical expenses and life insurance

What This Job Offers

• Job Type: Full-time
• Career Level: Principal