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. Qualifications Bachelor’s degree in Electrical Engineering, Mechanical Engineering, or other engineering discipline. 3+ 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 Houston or Mclean office 3 days a week. 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 [email protected] Benefits vary by role and location and are subject to change.