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

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.

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.
Hybrid in office up to 3 days a week and 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.

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.

Senior Project Engineer

Overview