Lead Chiller Controls Engineer

***Who are we?*** XNRGY Climate Systems is a North American leader in sustainable design and advanced manufacturing of custom air treatment systems. We are focused on research and energy development, contributing to the reduction of carbon footprint. As part of our expansion in the US, XNRGY is seeking an experienced **Lead Chiller Controls Engineer – Data Center Cooling** to join its team onsite in Mesa, Arizona. This hands-on leadership role will architect and develop controls logic with a focus on mission-critical data center cooling. The individual will drive innovation in high-performance thermal management applications for the business product lines and Research and Development projects. **An overview of your responsibilities:** The Lead Chiller Controls Engineer leads the design, development, and deployment of advanced control systems. This role applies a strong understanding of centrifugal compressor chiller mechanics to develop sequences of operation, create controls logic, write code, select controls PLC hardware, and select peripheral sensors and control valves for data center applications. The role also provides a strong technical role at the Mesa facility and mentors junior engineers and programmers. This role requires a solid understanding of compressor-based systems and overall system behavior to define control strategies and sequences of operation for complex chiller applications, along with structured control system development. The position provides technical leadership by guiding system-level decisions, aligning control approaches across projects, and ensuring consistent implementation. As a hands-on experienced engineer, the role contributes to control system development, troubleshooting, and continuous improvement, while mentoring engineers and programmers and supporting overall team capability. **Key Responsibilities** **Control System Design & Programming** • Lead the full lifecycle of control system projects: design, maintain, testing, commissioning, and ongoing optimization of controls logic, systems and hardware. Champion system-level design and integration efforts as the primary focus, with testing and commissioning. Strong expertise on the following: · Chiller sequence of operations · Hardware–software integration · Apply solid thermodynamics and refrigeration fundamentals • Develop, implement, and troubleshoot advanced and structured control logic for complex HVAC and centrifugal chillers (air-cooled and water-cooled) including free cooling with refrigerant pump utilized in data center cooling applications. Constantly seeking scalable and reusable solutions. • Design and maintain robust controls logic and interface solutions to deliver to ensure clear system visibility, diagnostics, and consistent operator interaction across implementations. • Define and maintain system documentation, including P&IDs, sequences of operation (SOO), I/O lists, and parameterization standards, to ensure alignment, traceability, and consistency across implementations. • Design and support communication architecture using industrial protocols (e.g., Modbus RTU/TCP, BACnet MS/TP and IP) to ensure reliable integration and data exchange across control system components. **Testing & Commissioning** • Lead in-house testing, system commissioning, and startup of equipment prior to shipment. • Perform hands-on diagnostics and root-cause analysis using industry-standard tools in the lab and on the production floor. • Define and maintain structured testing procedures and commissioning checklists to ensure consistent validation, repeatability, and alignment across system deployments. **Engineering & Optimization** • Apply core engineering principles (thermodynamics, heat transfer, fluid mechanics, controls, and power electronics) to optimize system performance, energy efficiency, and reliability. **Collaboration & Mentorship** • Collaborate cross-functionally with R&D, mechanical, electrical, and project teams. • Mentor junior eng…