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 & 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

#LI-JW1

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.

Agency Notice: ON.energy does not accept unsolicited resumes from staffing agencies, search firms, or third-party recruiters. Resumes submitted without a fully executed Master Services Agreement (MSA) and a written request from an authorized member of our Talent Acquisition team will be considered the property of ON.energy. No placement fees or compensation will be paid for unsolicited candidate submissions.