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

Requisition s 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 re

* Benefits vary by role and location and are subject to change.