Senior Project Engineer - Bess

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.

Location: Remote considered / Houston, TX or McLean, VA preferred

Travel: to project sites across the US, usually up to 30%, but occasionally 50%

Overview

• Support the end-to-end engineering execution of BESS projects for data centers, from development to commissioning.Manage the technical scope of projects and serve as the technical point of contract to the project manager.

• Coordinate with internal engineering, procurement, and construction teams to ensure project milestones are met.

• Collaborate with customers, EPC contractors, OEMs, and design consultants on integration of BESS with data center electrical infrastructure.

• Review and validate system designs (electrical, civil, mechanical) and vendor submittals to ensure technical compliance and quality.

• Design and develop Single line diagrams, Schematics, Wiring diagrams for Battery storage systems

• Prepare Electrical Equipment Specifications, Data Sheets, Purchase Requisitions and Bid evaluations for inverters, Switchgear, Transformers and other electrical equipment as required

• Develop Short circuit, load flow, and arc flash studies using software such as ETAP.

• Assist in developing project schedules, procurement plans, and technical documentation.

• Conduct site walks and support field activities during installation and commissioning.

• Participate in Factory and Site Acceptance Testing (FAT/SAT) of BESS components and systems.

• Identify technical risks and propose mitigation strategies in coordination with Project Management.

• Ensure all work is compliant with relevant codes (e.g., NEC, IEEE, NFPA) and On Energy Storage's internal standards.

Required Qualifications

• Bachelor's degree in Electrical Engineering, Mechanical Engineering, or other engineering discipline.
• 5+ years of experience in project engineering, preferably within the BESS, electrical infrastructure, or data center sectors.
• Familiarity with energy storage systems (CATL, Sungrow, Tesla, etc.) and high-voltage infrastructure.
• Strong understanding of electrical schematics, single-line diagrams, and equipment layouts.
• Strong understanding of the electrical system design, system studies, relay coordination, and protection & control.
• Proficiency in Microsoft Office, AutoCAD, power system study programs (Ex. ETAP, SKM).
• Basic understanding of Civil, Mechanical, and Structural work.
• Ability to read and understand project owner specifications and engineering drawings
• Ability to manage subcontractors and drive schedule of Engineering activities
• Ability to manage multiple projects concurrently
• Ability to problem solve issues and have an "outside the box" mentality
• Strong attention to detail, with the ability to recognize discrepancies
• Able to produce clear and concise documentation
• Strong work ethic
• Excellent interpersonal skills with the ability to work with clients and staff in a team.
• Excellent communication, problem-solving, and cross-functional coordination skills.
• Ability to travel to project sites across the U.S. as needed (up to 50%).

Preferred Qualifications

• Experience working on EPC or design-build projects in the energy or critical infrastructure sector in North America.

• Familiarity with commissioning protocols and QA/QC procedures for electrical systems.

• PE or EIT certification is a plus.

• Hybrid in office up to 3 days a week

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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
• Christmas Bonus (Aguinaldo): 30 days
• 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.
• Accommodations: If you need an accommodation during the application process, email recruitment@onenergystorage.com
• Benefits vary by role and location and are subject to change.