Thermal Systems Digital Twin Engineer Jobs

PassiveLogic

Location:
United States, Salt Lake City

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Not provided

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Job Description:

This is a career-defining opportunity to play a crucial role in a hyper-scale AI company that is transforming the future of autonomous systems, energy, and the built environment. The Thermal Systems Digital Twin Engineer will develop a library of physics-based models of building and HVAC components, equipment, assemblies, systems, buildings, and entire campuses. These models will support simulation, validation, and testing across teams. Validated models are used by our AI and Equipment Inferencer engine to optimize building system control.

Job Responsibility:

Component template development: Defines and develops fundamental component templates, in addition to managing the component template evolution process
Mathematical and system modeling: Develop mathematical models for equipment, thermo-physical systems, and building simulation
Model standardization and validation: Standardize and validate physics-based models for use by the PassiveLogic control engine for optimized autonomous control of buildings
Software and model development: Contribute to both model development and software implementation

Requirements:

Master’s or Ph.D. in Mechanical Engineering, Aerospace Engineering, Chemical Engineering, Applied Physics, or a related field, with a focus on thermal-fluid sciences
Strong understanding of thermodynamics, heat transfer, and fluid dynamics
Hands-on experience in first-principles (physics-based) modeling of thermodynamic, thermo-chemical, or thermo-mechanical devices
Experience with object-oriented simulation tools such as Modelica (or Dymola), Simscape, etc.
Understanding of buildings, mechanical systems, and process control
Strong skills in numerical methods, mathematical modeling, and data analysis
Interest in (or preferably, experience with) computer programming and/or software development
Exceptional communication skills
Organizational and strategic mindset
Collaborative mindset
Adaptability
Problem-solving orientation

Nice to have:

Modeling experience
Good analysis and problem-solving skills
experience with FEA modeling techniques
Fundamental building knowledge
Knowledge of the fundamentals of building energy and/or HVAC systems
Strong programming skills: Including but not limited to: Swift, Matlab, C++, C, etc.
Experience in HVAC Systems modeling
HVAC Equipment Modeling experience: Heat pump, boiler, storage tank, solar thermal panels etc.
Experience in git version control
Experience/familiarity with: Graph theory and Bond Graph modeling approaches
EnergyPlus
Swift language development experience (S4TF even better)
Heuristic, statistical, or machine learning methods
Working in a startup

What we offer:

Competitive compensation
Generous equity share package
Medical, dental and vision coverage
Disability and life Insurance options
Flex PTO
Team-building events
Free catered lunch in the office Monday — Friday
Free ski pass (We are at the base of Big Cottonwood Canyon)
Free National Park pass

Additional Information:

Job Posted:
December 11, 2025

Employment Type:

Fulltime

Work Type:

On-site work

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Thermal Systems Digital Twin Engineer