Thermal Engineer, Analysis

Harbinger is an American commercial electric vehicle (EV) company on a mission to transform an industry starving for innovation. Harbinger’s best‑in‑class team of EV, battery, and drivetrain experts have pooled their deep experience to bring a first‑of‑its‑kind EV platform to support the growing demand for medium‑duty EVs and hybrids. Harbinger:
Familiar Form, Revolutionary Foundation.

The Thermal Engineering team is looking for a seasoned thermal analysis engineer to support the future of medium‑duty trucks. The candidate will develop thermal simulations to support the design and development of electric motors, batteries, power electronics, and more, work with test engineers to validate simulation results, and provide feedback to design teams to improve product performance and reliability in a fast‑paced startup environment.

$140,000 - $160,000 USD

• Develop and document thermal simulations for various vehicle components in a 3D simulation environment.
• Assess the thermal performance of vehicle components under both steady‑state and transient conditions, providing performance recommendations to design engineers.
• Document and post‑process simulation results in an organized manner.
• Develop test plans and support the test team in gathering data from physical systems.
• Iterate simulation models to achieve strong correlation and build confidence in results.
• Use simulation models and tools to identify root causes of issues observed during testing and provide feedback to improve reliability.

• Hold a Bachelor’s degree or an equivalent relevant educational credential.
• Have 5+ years of experience in thermal and/or fluid analysis.
• Demonstrate strong proficiency in STAR‑CCM+ or similar analysis tools.
• Possess the ability to run large simulation models on HPC clusters.
• Communicate simulation results effectively in both oral and written formats.
• Exhibit strong problem‑solving skills and the ability to collaborate in a dynamic team environment.
• Bring hands‑on experience in testing automotive components.
• Experience with multi‑phase simulations (e.g., VoF or Mixture Multi‑Phase) is a significant plus.
• Familiarity with 1D analysis tools is considered a bonus.

• Early‑stage Stock Options
• Robust Retirement Savings (401k, HSA, FSA)
• Annual Vacation Bonus
• Wellness & Fertility Benefits
• Cell Phone Stipend
• Complimentary Meals & Stocked Kitchens

Harbinger is an equal opportunity employer and complies with all applicable federal, state, and local fair employment practices laws. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, ancestry, sex, sexual orientation, gender, gender expression, gender identity, genetic information or characteristics, physical or mental disability, marital/domestic partner status, age, military/veteran status, medical condition, or any other characteristic protected by law.

Harbinger is committed to ensuring that our hiring process is accessible for persons with disabilities. If you have a disability or limitation, such as those covered by the Americans with Disabilities Act, that requires accommodations to assist you in the search and application process, please email us at

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(ii) carrying out, analyzing and improving our application and recruitment process, including assessing you and your application and conducting employment, background and reference checks; (iii) establishing an employment relationship or entering into an employment contract with you; (iv) complying with our legal, regulatory and corporate governance obligations; (v)…