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: United States, Remote with 30% travel, domestic and international Travel: 25-30% required travel As a Senior Electrical Engineer – Battery Systems, Controls & EMS Integration, you will provide technical leadership for the design, validation, and optimization of utility-scale Battery Energy Storage System (BESS) projects supporting next-generation data center and grid applications. Reporting to the Chief Electrical Engineer, you will lead battery sizing, evaluate BESS technologies, validate inverter/PCS performance, and drive the integration of EMS, Plant Controllers, and SCADA systems to ensure reliable, high-performing energy storage solutions. This is a highly collaborative role that combines advanced engineering analysis, controls expertise, and operational optimization to shape the future of large-scale energy infrastructure. Key Responsibilities: · Battery sizing and lifecycle modeling · BESS vendor model review and validation · EMS and Plant Controller integration · Controls strategy validation · Inverter/PCS modeling experience · SCADA and operational analytics · Python, VS Code, Jupyter Notebooks, Git Required Qualifications: · 8+ years of electrical engineering experience, with a focus on battery systems, BESS vendor evaluation, inverter/PCS performance validation, and EMS or Plant Controller integration. · Battery, PCS & Controls Expertise: Deep knowledge of battery sizing, lifecycle modeling, controls strategy validation, and BESS vendor model review in utility-scale energy storage environments including experience with PSCAD and MATLAB. · Systems Integration: Proven ability to lead EMS and Plant Controller integration efforts, including SCADA configuration and operational optimization for BESS deployments. · Software Proficiency: Working knowledge of Python, VS Code, Jupyter Notebooks, and Git for engineering analysis and operational analytics. · Communication: Ability to coordinate effectively with EMS vendors, controls engineers, and cross-functional teams to deliver reliable and optimized energy storage solutions. #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.