Senior Project Engineer - BESS

About the role

Senior Project Engineer - BESS ON.energy is building the backbone of energy and AI infrastructure powering grid-safe data centers and mission-critical facilities. The company supplies and operates hyperscale power systems that solve the toughest resilience challenges, delivering custom solutions for AI data centers, mission-critical facilities, and front-of-the-meter assets. ON recently announced a 5GW partnership, with 3GW currently under construction across multiple hyperscale data center campuses. With patented technology and proprietary software, ON.energy develops projects worldwide that set new benchmarks for resilience. Location: Remote considered / Hybrid in Houston, TX or Tysons, VA preferred Travel: 20-30% travel to project sites in the US 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