Thermal Engineer

Austin, TX

Full Time

Posted October 1, 2026

$123k - $175k· Est.

Application opens on company website

Source: Lever View original listing
Freshness: Open in the current public read path; this is not an employer guarantee.Last observed October 5, 2026
Classification: Modern power-system classification not yet published for this listing.Legacy source industry field: Nuclear Energy
Pay provenance: Estimated benchmark; not employer-provided

Last Energy is a pioneering US technology company focused on fleet-wide deployment and operation of next-generation nuclear assets.

Lead the conceptual design, analysis, and execution of critical thermal-mechanical components and systems for our advanced power plant
Drive mechanical design of components subject to thermal loading
Own the design of heat exchangers, piping networks, fluid storage tanks, and other pressure-boundary equipment, and partner with our structural engineers on validation, ensuring structural integrity, thermal performance, and design safety across key reactor components
Perform thermal and structural analyses (thermal stress, fatigue, and thermal expansion) to validate component designs against pressure, temperature, and cyclic loading requirements
Contribute directly to the mechanical design and optimization of critical thermal components, translating thermal performance requirements into manufacturable, deployable hardware
Collaborate daily with a multidisciplinary team to integrate thermal-mechanical solutions into cohesive, plant-level designs
Support material selection, tolerancing, and design-for-manufacturing decisions for components operating under high-temperature and high-pressure conditions
Operate autonomously, driving projects from concept to design verification in a startup culture that values speed, ingenuity, and accountability

BS or MS in Mechanical Engineering or related field, with 7+ years of hands-on industry experience designing components under thermal and mechanical loading
Proven experience as a Mechanical, Thermal, or Design Engineer working on thermal systems components within power plant, nuclear, or complex industrial systems
Proficiency in 3D CAD software (e.g., Autodesk Inventor, SolidWorks, Siemens NX, PTC Creo) for mechanical design of thermal-mechanical components and assemblies
Proficiency in analysis software (e.g., ANSYS Mechanical, Abaqus, SolidWorks Simulation) for structural and thermal stress analysis
Solid working knowledge of heat transfer, thermodynamics, and mechanical design principles (fatigue, fracture, thermal expansion, pressure-boundary design)
Experience with pressure vessel or piping design codes a strong plus (ASME BPVC Section III/VIII, B31.1/B31.3)
Practical, hands-on approach to problem-solving with a bias toward manufacturable, deployable designs over purely academic analysis
Excellent communication skills and a willingness to work collaboratively in a cross-functional, startup team environment