Jr. Project Engineer – Battery Energy Storage Systems; BESS

Jr. Project Engineer – Battery Energy Storage Systems (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.

The Jr. Project Engineer will support the engineering execution of Battery Energy Storage System (BESS) projects for data centers, from initial development through commissioning. This role involves technical coordination, design validation, and collaboration with internal teams and external stakeholders to ensure successful project delivery.

Hybrid role located in Houston, TX or Reston, VA or Alpharetta, GA or Miami, FL.

• Assist in the end-to-end execution of BESS projects, including design, procurement, installation, and commissioning.
• Serve as a technical resource for project managers and coordinate with engineering, procurement, and construction teams to meet project milestones.
• Collaborate with customers, EPC contractors, OEMs, and consultants to integrate BESS into data center electrical infrastructure.
• Review and validate system designs (electrical, civil, mechanical) and vendor submittals for compliance and quality.
• Develop electrical drawings such as single‑line diagrams, schematics, and wiring diagrams for battery storage systems.
• Prepare equipment specifications, data sheets, purchase requisitions, and bid evaluations for electrical components (inverters, switch gear, transformers, etc.).
• Perform system studies (short circuit, load flow, arc flash) using software tools like ETAP or SKM.
• Support project scheduling, procurement planning, and technical documentation.
• Participate in site walks, installation support, and commissioning activities.
• Assist with Factory and Site Acceptance Testing (FAT/SAT) of BESS components.
• Identify technical risks and propose mitigation strategies in coordination with project management.
• Ensure compliance with relevant codes (NEC, IEEE, NFPA) and company standards.

• Bachelor’s degree in Electrical Engineering, Mechanical Engineering, or a related field.
• 0–3 years of engineering experience (internships or co‑op experience acceptable).
• Familiarity with energy storage systems (e.g., CATL, Sungrow, Tesla) and high‑voltage infrastructure preferred.
• Understanding of electrical schematics and system design fundamentals.
• Proficiency in Microsoft Office; basic knowledge of AutoCAD and power system analysis tools (ETAP, SKM).
• Ability to read and interpret engineering drawings and specifications.
• Willingness to travel up to 30% for project site visits.

• Basic understanding of civil, mechanical, and structural aspects of projects.
• Strong problem‑solving skills and ability to think creatively.
• Excellent attention to detail and documentation skills.
• Effective communication and teamwork abilities.

• Competitive salary + performance bonus
• 401(k) match, health, vision, dental
• Paid time off and company holidays
• Work that matters—building resilient, secure infrastructure for the future of energy

• Seniority level:
  Internship
• Employment type:
  
  Full‑time
• Job function:
  Engineering and Information Technology

Referrals increase your chances of interviewing rgy by 2x.