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Senior Project Engineer - BESS

Houston, Texas, United States; Tysons

ON.energy is setting the standard for large load interconnection. ON’s patented AI UPS™ is a medium-voltage UPS that serves as a firewall, protecting the data center from the grid, and the grid from the data center. With multiple gigawatts currently under construction, we are enabling grid-safe data centers. 

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.
  • 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.

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