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.

Role Summary

At ON.energy, the Simulation Engineer for Battery Energy Storage Systems (BESS) is responsible for building, running, and validating simulation environments that ensure our energy management software performs correctly before it ever touches real hardware. This is a simulation-first role where the primary deliverables are high-fidelity Software-in-the-Loop (SIL) and Hardware-in-the-Loop (HIL) test environments that give our engineering teams confidence in every algorithm, control loop, and protection function we deploy.

The idóneo candidate is an early-career engineer with a solid foundation in dynamic systems, power electronics, or control theory, and a hands-on curiosity for building models that accurately reflect real BESS behavior.



This role offers direct mentorship from senior R&D; engineers and access to industry-leading real-time simulation hardware.

Key Responsibilities

SIL Simulation & Validation
- Develop and maintain Software-in-the-Loop (SIL) environments in MATLAB/Simulink to validate energy management algorithms, protection logic, and control strategies prior to hardware integration.
- Build high-fidelity battery system models in Simulink — including cell electrochemistry, thermal dynamics, State of Charge (SoC), and State of Health (SoH) — and continuously improve model fidelity against measured data.
- Design and execute automated regression test suites in MATLAB to verify algorithm correctness across operating modes, edge cases, and fault scenarios.
- Analyze simulation outputs, document findings, and communicate results clearly to the broader engineering team.

HIL Testing & Integration
- Support the setup, configuration, and op

📌 Junior Simulation Engineer (México)
🏢 On.Energy
📍 México