Senior Modeling Engineer
Company: Johnson Controls
Location: Milwaukee
Posted on: March 31, 2026
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Job Description:
Job Description What You Will Do Johnson Controls’ Data Center
Thermal Technology Solutions group is seeking a Senior Modeling
Engineer. As a member of the modeling team, you will develop and
apply numerical models to simulate the end-to-end performance of
data center cooling systems. You will play a key role on
cross-functional teams responsible for creating comprehensive
thermal solutions for data center applications. Your primary focus
will be simulating system performance and providing design and
application guidance based on model results. As part of the
advanced development team, you will also stay current on emerging
technologies in the data center cooling space and evaluate
innovations that may influence future product offerings. We prefer
to have this candidate based in our Glendale, WI, or York, PA,
office; however, this can also be a remote opportunity for the
right candidate! How You Will Do It Develop numerical simulations
of thermal components commonly used in data center applications.
Integrate subsystems into complete thermal solutions, coordinating
across cooling loops, controls, and heat-rejection equipment. Use
simulation tools to predict chip-to-ambient performance of data
center cooling systems. Apply system-level performance models to
provide technical guidance to customers. Present project status,
technical findings, and strategic recommendations across
departments. Deliver presentations and/or write white papers
communicating JCI’s technical perspective on emerging technologies
and system architectures. Actively participate in industry groups
such as ASHRAE and the Open Compute Project. What You Will Need
Required Master’s or PhD in Mechanical Engineering or a related
field. 3 years of industry experience with thermal products or
systems. Strong theoretical foundation in thermodynamics, heat
transfer, and fluid mechanics. Experience with HVAC system design,
refrigerant cycles, and component selection. Proficiency with
numerical simulation tools for building and thermal applications
(e.g., Modelica, MATLAB/Simulink, EES, EnergyPlus). Broad
cross-domain knowledge spanning thermal, controls, and electrical
systems—generalists with strong multidomain capability are highly
valued. Proficiency with Microsoft 365/Excel, including basic
macros/VBA for data analysis and reporting. Demonstrated ability to
execute cross-functional projects. Preferred Python scripting and
environment management (package installation, virtual environments,
basic automation). Fundamentals of controls engineering (feedback
loops, PID tuning, system response). Basic understanding of
electrical systems (motor sizing, VFDs, power distribution).
Experience with refrigeration system design and refrigerant
properties. Familiarity with data center cooling architectures
(direct liquid cooling, rear-door heat exchangers, CDUs). Expertise
in one or more thermal domains (CDUs, chillers, dry coolers,
cold?plate systems).
Keywords: Johnson Controls, West Allis , Senior Modeling Engineer, Engineering , Milwaukee, Wisconsin
