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Thermal Systems Digital Twin Engineer

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PassiveLogic

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Location:
United States, Salt Lake City

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

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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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