Junior Simulation Engineer - EMS

ON.energy; Mexico; Hybrid; PHP 4,688,000 - 7,813,000; Full time

Benefits offered by this job

Competitive salary & annual bonus

Medical, dental, and vision insurance

401(k) with company match

Paid time off and holidays

Professional development opportunities

Job summary

ON.energy is seeking an entry-level Simulation Engineer for Battery Energy Storage Systems (BESS) to build, run, and validate SIL/HIL environments. You will develop high-fidelity battery models in Simulink, validate energy management algorithms, and contribute to test automation and documentation.

Mentorship from senior R&D engineers will guide your growth in real-time simulation hardware. The role emphasizes hands-on modeling, control theory foundations, and cross-functional collaboration

Qualifications

• Hands-on MATLAB/Simulink for model-based design and system simulation.
• Understanding of SIL and HIL testing methodologies and their fit in a V-model process.
• Foundational knowledge of battery systems, power electronics, or energy storage technologies.
• Coursework or project experience in control theory, embedded systems, or mechatronics.
• Ability to document results clearly and communicate simulation findings to multidisciplinary teams.
• Exposure to EMS/BMS hardware interfaces and real-time simulation concepts.
• Version control for simulation projects and collaboration workflows.

Responsibilities

• Develop and maintain SIL environments in MATLAB/Simulink to validate energy management algorithms.
• Build high-fidelity battery models in Simulink, including SoC/SoH and thermal dynamics.
• Design automated regression tests in MATLAB to verify algorithms across modes and fault scenarios.
• Analyze simulation outputs and communicate findings to the engineering team.
• Support HIL setup, interfacing EMS and BMS hardware with real-time simulations.
• Establish communication between hardware controllers and simulations via CAN/Modbus/DNP3/IEC 61850.
• Collaborate on model development for battery, inverter, and grid interaction.
• Maintain test plans, reports, and setup guides for simulations.

Skills

MATLAB

Simulink

Model-based design

Control theory

Technical documentation

Python

V-model development

Education

Bachelor's degree in Electrical Engineering, Mechanical Engineering, Systems Engineering, or related field

Tools

CAN protocol

Modbus RTU/TCP

DNP3

IEC 61850

Simulink Coder

Git-based workflows

Job description

ON.energyis 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.energydevelops projects worldwide that set new benchmarks for resilience.

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 ideal 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 operation of Hardware-in-the-Loop (HIL) test environments, interfacing real EMS and BMS hardware with real-time simulation platforms.
• Establish reliable communication between hardware controllers and simulation environments over industrial protocols such as CAN, Modbus, DNP3, or IEC 61850.
• Execute functional, edge-case, and fault-injection test campaigns against EMS control logic, documenting pass/fail results and root-cause analyses.
• Assist in debugging hardware-software communication issues and contribute to the continuous improvement of the HIL test infrastructure.

Model Development & Algorithm Support

• Collaborate with senior engineers to develop and refine Simulink models of battery behavior, inverter dynamics, and grid interaction for use across SIL and HIL environments.
• Assist in prototyping energy management strategies including peak shaving, frequency regulation, and charge/discharge optimization — running simulation campaigns to evaluate performance.
• Contribute to model-based design workflows in Simulink, supporting automatic code generation and deployment pipelines.
• Maintain detailed technical documentation: test plans, test reports, model specifications, and simulation environment setup guides.
• Participate in design reviews and contribute to internal knowledge-sharing and lessons-learned sessions.
• Work cross-functionally with hardware, software, controls, and field engineering teams throughout the product development lifecycle.

Key Requirements

• Entry-Level, 0–2 years of experience
• Hands-on experience with MATLAB and Simulink for model-based design and system simulation. Coursework, capstone, or internship experience is accepted.
• Demonstrated understanding of Software-in-the-Loop and Hardware-in-the-Loop testing methodologies — what they validate, when to use each, and how they fit into a V-model development process.
• Foundational knowledge of battery systems, power electronics, or energy storage technologies. Familiarity with SoC, SoH, and basic BMS functionality.
• Coursework or project experience in control theory, embedded systems, or mechatronics. Ability to interpret and validate control logic behavior in simulation.
• Ability to write clear technical documentation and communicate simulation findings to multi-disciplinary engineering teams.
• Exposure to Hardware-in-the-Loop testing concepts and real-time simulation environments. Familiarity with how EMS/BMS hardware interfaces with simulation platforms is a plus.
• Familiarity with CAN, Modbus RTU/TCP, DNP3, or IEC 61850 — enough to understand tag structure and how data availability shapes simulation interfaces.
• Experience with MATLAB scripting for test automation, post-processing, and regression pipeline development. Python familiarity is a plus.
• Bachelor's degree in Electrical Engineering, Mechanical Engineering, Systems Engineering, or a related field — or equivalent professional experience.

Preferred Experience

• Experience with BESS, inverters, or distributed energy resources (DER) and familiarity with their operational state models and protection logic.
• Ability to read and interpret single-line diagrams and understand basic power system concepts — important context for modeling accurate BESS behavior.
• Exposure to version control for simulation projects (e.g., Git-based workflows for MATLAB/Simulink models).
• Knowledge of Li-ion or LFP battery chemistry and cell-level behavior.
• Experience with code generation from Simulink models (Simulink Coder) for deployment to embedded or real-time targets.

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
• 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.