Principal Test Engineer

ON.energy; Denver (CO); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Medical, dental, and vision insurance

401(k) with company match

Paid time off and holidays

Job summary

ON.energy in the Greater Denver area is seeking a Principal Test Engineer to lead end-to-end validation, de-risk product architectures, and orchestrate lab-based testing using HIL assets.

You will coordinate with investigators, facilities, and field teams; design test protocols, ensure safety compliance, and translate lab learnings into actionable recommendations for product and firmware development.

Qualifications

• 12+ years of electrical engineering experience in power systems and grid-tied technologies.
• B.S./M.S. in Electrical Engineering, Systems Engineering, or related field.
• Experience testing and modeling grid code compliance of large inverter-based resources; DOE/National Lab experience preferred.

Responsibilities

• Test orchestration and planning with HIL assets to validate performance under extreme conditions.
• De-risking and technical validation through failure-mode discovery and data translation.
• Staff mentoring, SOP development, and coordination across facilities and project teams.

Skills

Electrical engineering

Test validation

De-risking

Education

B.S./M.S. in Electrical Engineering

Tools

Laboratory testing

Job description

Houston, Texas, United States; Miami, Florida, United States

ON.energyis 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.

Location: This position will be primarily located in the Greater Denver, CO area, with travel expected to Houston, Texas five to six times per year.

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.

Key Responsibilities

Test Orchestration and Planning

• Facility Coordination: Serve as the primary technical point of contact for principal investigators and facility managers.
• Test Protocol Development: 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.
• Compliance & Safety: Ensure all On Energy hardware and test procedures comply with industry safety standards and local Site Operations protocols.

De-risking & Technical Validation

• Failure Mode Discovery: Use laboratory controlled environment to identify edge-case failures that are impossible to test in live field environments.
• Data Translation: 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.
• Verification: Report on data collected relative to product requirements and performance criteria for internal and customer review.

On Energy Commissioning and Training Coordination

• Staff Mentorship: 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.
• Manual Development: Convert lab-based learnings into field-ready Commissioning SOPs and Troubleshooting Guides.
• Staff Rotation Management: Coordinate the rotation of On Energy field technicians through the NLR facility to ensure knowledge transfer is uniform across the commissioning department.

Experience & 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
• Education: B.S./M.S. in Electrical Engineering, Systems Engineering, or a related field.
• Familiarity: Prior experience testing and modeling grid code compliance of large inverter-based resources. Experience working at a National Lab or within the DOE framework is preferred.
• Domain Expertise: Deep understanding of Energy Storage Systems (BESS), Power Electronics (Inverters/Rectifiers), and Grid-Forming technologies.
• The "Liaison" Factor: Exceptional communication skills—the ability to speak "Research" to NLR scientists and "Deployment" to On Energy field technicians.
• This role will lead initiatives in Denver Colorado and Houston Texas with periodic travel to both along with other On Energy project sites for the transition of validated technologies.

For US-based roles - What you’ll get:

• Competitive salary + annual performance-based bonus eligibility
• Medical, dental, and vision insurance
• 401(k) with company match
• Paid time off and company holidays

For Mexico-based roles - What you’ll get:

• Competitive salary + annual performance bonus eligibility
• Major medical expenses and life insurance
• Paid time off and holidays (per local policy)

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

Agency Notice

ON.energy does not accept unsolicited resumes from staffing agencies, search firms, or third-party recruiters. Resumes submitted without a fully executed Master Services Agreement (MSA) and a written request from an authorized member of our Talent Acquisition team will be considered the property of ON.energy. No placement fees or compensation will be paid for unsolicited candidate submissions.