Principal Systems Engineer - R&D

ON.energy; Houston, Miami, Reston (TX, FL, VA); Hybrid; USD 180,000 - 240,000; Full time

Benefits offered by this job

Competitive salary

Medical, dental, and vision insurance

401(k) with company match

Paid time off and holidays

Job summary

ON.energy is seeking a Principal Systems Engineer to originate and lead the design of new products for grid-scale energy storage systems. You will own requirements development, prototype leadership, and cross-functional coordination with vendors and leadership.

Based in Denver, CO or Houston, TX, you will drive early-stage prototyping, architect system topologies, and ensure robust design reviews and transition to product engineering while advancing the company’s mission in clean energy.

Qualifications

• Bachelor-level degree in an engineering field; advanced degrees preferred.
• 10+ years in systems engineering for power/electronics hardware or energy storage.
• Experience leading design reviews and mentoring engineers.

Responsibilities

• Originate product concepts and define technical approach for new products.
• Develop and maintain system requirements and ensure traceability.
• Lead architecture definition, prototyping, and early validation activities.
• Coordinate with vendors for design proposals and qualification testing.
• Perform trade studies and risk-based prioritization across programs.
• Guide design transfer from R&D to product engineering and support deployment.

Skills

Systems engineering

Power electronics

Grid-scale energy storage

Requirements engineering

Vendor coordination

Structured trade studies

Technical leadership

Cross-functional collaboration

Education

B.S. in Electrical Engineering or related

M.S. or Ph.D. preferred

Tools

MATLAB/Simulink

Job description

Houston, Texas, United States; Miami, Florida, United States; Reston, Virginia, 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.

Job Description: Principal Systems Engineer, R&D

Role Objective

The Principal Systems Engineer will serve asatechnical originator and design authority for newON.energyproducts. This role is responsible for identifying and shaping new product concepts, leading engineering teams through preliminary design, and supporting the transition from prototype to full productization. The Principal Systems Engineer will own requirements development, drive early-stage prototyping, coordinate with supply vendors on component engineering, and apply structured qualitative decision-making to navigate the trade-offs inherent in grid-scale energy storage system design. Residing within the R&D team, this position ensures thatON.energy’sproduct pipeline is grounded in sound, agilesystems engineeringpractice.

Key Responsibilities

• Product Concept Origination

Opportunity Identification: Monitor market signals, customer feedback, field performance data, and technology trends to identify opportunities for new products or significant architectural evolution of existingON.energyplatforms. Translate unmet needs into preliminary product concepts with clear value propositions.

Feasibility Assessment: Conduct early-stage technical feasibility studies,evaluatingproduct suppliers, novel topologies, and control strategiesto down-select concepts before committing engineering resources.Coordinate internal and external subject matter expertise review and feedback into all evaluations.

Concept Documentation: Author concept proposals that articulate the technical approach, target specifications, competitive differentiation, key risks, and resource estimates. Present concepts to R&D leadership and cross-functional stakeholders for stage-gate review.

• Requirements Development and Management

System Requirements Authoring: Develop and maintain system-level requirements documents that capture functional, performance, environmental, safety, and regulatory requirements for new products. Ensure requirements are traceable, testable, and aligned with customer and grid code obligations.

Requirements Flow-Down: Decompose system requirements into subsystem and component specifications. Coordinate with discipline engineers to ensure consistent interpretation and compliance.

• Preliminary Design Leadership

Architecture Definition: Lead the definition of system architectures for new products, including power conversion topology, DC bus design, protection and isolation strategy,control hierarchy, and mechanical/thermal layout. Produce system block diagrams, interface control documents, and preliminary design packages.

Prototyping and Early Validation: Plan and oversee prototyping activities to retire key technical risks early in the design cycle. Define prototype scope, success criteria, and test plans. Coordinate rapid-build efforts across hardware, firmware, and test teams.

Design Reviews: Organize and lead preliminary design reviews (PDRs).

Vendor Technical Interface: Serve as the primary engineering point of contact with component and subsystem vendors. Communicate technical requirements, review vendor design proposals, and negotiate specification compliance.

Vendor Qualification and Selection: Lead technical evaluation of prospective vendors through design audits, capability assessments, and prototype sample testing. Provide engineering input to make/buy decisions and vendor selection trade studies.

Supply Chain De-Risking: Alignearly stagereviews of supplier readiness with supply chain team.

• Qualitative Decision-Making and Trade Studies

Structured Trade Analysis: Design and facilitate trade studies that weighproduct success criteria.

Risk-Informed Prioritization: Maintain a living technical risk register for each product development program. Prioritize risk-retirement activities based onconsequenceandlikelihood, andensure mitigation plans are resourced and tracked.

Cross-Functional Alignment: Facilitate decision-making across engineering, product management, operations, and supply chain stakeholders.

Design Transfer: Support the transition of validated designs from R&D intoproductengineering.

Production Issue Resolution: Provide systems-level engineering support during initialproductdeployment. Triageintegrationand commissioning issues, lead root-cause investigations, and implement design correctionswith the help of other R&D verticals.

Continuous Improvement: Feed field performance data and production lessons-learned back into the design process.

Experience and Requirements

Education: B.S. in Electrical Engineering, Systems Engineering, Mechanical Engineering, or a closely related field. M.S. or Ph.D. preferred.

Experience: 10+ years of systems engineering experience in power electronics, energy storage, or adjacent power/energy hardware product development, with demonstrated progression from individual contributor to technical leadership. Track record of taking products from concept through production release.

Grid-Scale Energy Storage: Direct, hands-on experience with grid-scale battery energy storage systems (BESS) ispreferred. Deep familiarity with BESS architectures, inverter topologies, DC system design, thermal management, and the regulatory and standards landscape (IEEE 2800, UL 9540, NFPA 855, NERC).

Requirements Engineering: Proven experience authoring, managing, and flowing down system requirements for complex electromechanical products.

Vendor Coordination: Experience managing technical relationships with component and subsystem vendors, including specification development, design review, and qualification testing.

Decision-Making Frameworks: Demonstrated use of structured qualitative decision-making methodsto drive design choices in ambiguous or multi-objective environments.

Technical Communication: Exceptional ability to communicate complex systems engineering concepts to diverse audiences.Comfortable leading design reviews and presenting to senior leadership.

This role is based in Denver, Colorado or Houston, Texas, with regular travel betweenON.energyoffices, vendor facilities, national lab partners, and customer project sites to advance product development from concept through deployment.

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.