Software & Controls Engineer - Energy Management Systems

ON.energy is 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.energy develops projects worldwide that set new benchmarks for resilience. The Software & Controls Engineer is responsible for the design, development, testing, integration, and commissioning of control software and automation systems that ensure the reliable, efficient, and safe operation of energy storage systems and power infrastructure projects. This role bridges software engineering, control systems, and field deployment, working closely with internal engineering teams, project management, vendors, and clients to deliver high-performance control and SCADA solutions that meet safety, regulatory, and operational requirements. Key Responsibilities Design, model, and implement control algorithms and control strategies for energy storage systems and power infrastructure. Contribute to system architecture discussions and define control strategy requirements and functional specifications. Design, develop, and maintain PLC, HMI, and embedded/control software for energy storage and distributed energy systems. Configure, integrate, and maintain SCADA systems for BESS and power infrastructure projects. Write clean, efficient, maintainable, and well-documented code following best practices. Build automation scripts, testing tools, simulation environments, and continuous integration pipelines. Implement version control, software documentation, and CI/CD workflows. Collaborate with electrical, mechanical, firmware, and field service teams to ensure full system functionality and seamless integration. Support the selection, configuration, and integration of control hardware, including controllers, relays, meters, and network devices. Conduct Factory Acceptance Tests (FATs) and Site Acceptance Tests (SATs). Diagnose and resolve issues related to control logic, real-time execution, PLC/SCADA behavior, and system performance, both remotely and on-site. Ensure compliance with cybersecurity requirements and relevant standards and codes (e.g., UL, IEEE, NFPA). Support installation, commissioning, field deployments, and ongoing operational troubleshooting. Interface with clients, vendors, and internal stakeholders to provide technical documentation, training, and ongoing support. Requirements Bachelor’s degree in Electrical Engineering, Controls, Software Engineering, or a related field, or equivalent experience. 3-5 years of experience developing PLC, HMI, and control software for industrial or energy systems Strong object-oriented programming skills (e.g., C++, C#, Python, or similar). Hands-on experience with Siemens PLC programming (TIA Portal). Experience with Ignition SCADA, including HMI development and system integration. Familiarity with control algorithms, real-time systems, and industrial automation concepts. Knowledge of industrial communication protocols (e.g., Modbus, OPC UA, Profinet). Experience with version control systems and structured software development practices. Ability to troubleshoot control systems both remotely and on-site. Willingness to travel for commissioning and field deployments, including travel to the United States 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 P…