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Updated twice daily · Oct 15, 2026
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Principal Mechanical Engineer - Thermal Engineer

RTX (Raytheon)Tucson, AZ$118,300 - $224,900

This engineer will evaluate thermal performance from early design studies through qualification, production, and field support, using hand calculations and detailed simulation tools. Responsibilities include developing test plans, analyzing and reducing test data, correlating thermal models, documenting findings, and presenting results to technical and government customers. The position operates within a multidisciplinary structural and thermal engineering team and includes peer reviews, process improvement, and leadership of analysis or test efforts. It is well suited to an experienced thermal analyst who can work independently, manage cost and schedule commitments, and guide other engineers. Work is onsite in Tucson and requires U.S. citizenship plus an active or transferable Secret clearance, or the ability to obtain the required clearance before starting.

Requirements

Bachelor’s degree in STEM and at least 8 years of relevant experience, or equivalent advanced-degree experienceThermal analysis experience using tools such as FloTHERM, PATRAN, Thermal Desktop/SINDA, ANSYS, or equivalentsStrong understanding of thermodynamics and classical thermal analysis, including finite element methodsExperience planning, executing, reducing, and correlating thermal test dataDemonstrated leadership of thermal analysts or major thermal testing effortsU.S. citizenship and ability to obtain an active, transferable DoD Secret clearance
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Listed October 16, 2026 · Verify details with the employer before applying.

About RTX (Raytheon)

Missile maker Raytheon, an RTX business, says its Tucson campus is home to Tomahawk and AMRAAM missiles and is adding automated factories (as of Oct. 2026).

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