Thermal Systems Engineer II

What You Will Do

Johnson Controls is seeking a Senior Thermal Data Center Systems Engineer to support the thermal subsystem or component designs within the data center cooling product portfolio. In this role, you will operate with minimal supervision, determining approaches to thermal solutions and leading small technical efforts. You will demonstrate proficiency across multiple thermal domains and understand the complete thermal chain from server to ambient. This position is based onsite, minimum 3 days per week, at our Advanced Technology and Innovation Center located in New Freedom, PA. Candidates must be commuting distance to the facility or able to relocate.

How You Will Do It

• Own thermal subsystem or component designs for data center cooling products (dry coolers, remote condensers, CDUs, cold plate systems)
• Define specifications for thermal features or products; develop test protocols and acceptance criteria
• Lead prototype development and validation activities; develop and execute comprehensive test plans
• Integrate multiple components into subsystem solutions understanding the complete thermal chain
• Participate in process improvement for testing and analysis methods
• Guide and mentor less experienced engineers; represent Engineering in cross-functional activities

What you will need

• Required: Bachelor of Science in Mechanical Engineering or related field required, 2+ years of thermal/HVAC design experience
• Preferred: Microsoft 365/Excel (including basic macros/VBA for data analysis and reporting), CAD proficiency (SolidWorks, Creo, or equivalent), Engineering calculations and documentation (MathCAD, EES, or equivalent), Heat transfer analysis (conduction, convection, two-phase), Thermodynamic cycle analysis, Fluid mechanics and hydraulic system design, Thermal system component sizing and selection, Product development lifecycle experience, Prototype fabrication and hands-on testing, Cross-functional project execution

Preferred

• Python scripting and environment management (package installation, virtual environments, basic automation)
• CFD (ANSYS Fluent, Star-CCM+, OpenFOAM, or equivalent)
• FEA (ANSYS Mechanical, Abaqus, or equivalent)
• MATLAB/Simulink for system modeling and controls
• Controls fundamentals (feedback loops, PID tuning, system response)
• Electrical systems basics (motor sizing, VFDs, power distribution)
• Refrigeration system design and refrigerant properties
• Data center cooling architectures (direct liquid cooling, rear-door heat exchangers, CDUs)