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Last Energy

Posted 4 months ago

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Senior Mechanical Engineer

AustinOn-siteFull-time

AI Summary

Senior Mechanical Engineer who leads design and execution of critical mechanical and system-level solutions for modular nuclear power plants, collaborating directly with executive leadership.

About this role

Last Energy is a pioneering US technology company deploying next-generation modular nuclear power plants. With projects underway in the US and UK, we’re transforming how nuclear energy is designed, built, and delivered—through high-throughput manufacturing, efficient supply chains, and rapid deployment strategies.

As a Senior Mechanical Engineer at Last Energy, you’ll work directly with the CEO and core leadership team to drive forward the most critical mechanical and system-level challenges shaping our fleet-wide product. This is a role for builders, doers, and innovators who thrive in a fast-paced, hands-on environment where decisions are made quickly and your ideas directly shape the product.

Key Duties & Responsibilities

  • Lead design and execution of critical mechanical systems and components that enable scalable, manufacturable nuclear power plants
  • Collaborate daily with the CEO and executive team on the company’s most urgent engineering priorities—your technical insights will directly inform product strategy and deployment timelines
  • Drive concept development, detailed CAD modeling, and rapid prototyping of novel industrial systems
  • Perform structural, thermal, and fluid analyses using advanced simulation tools (FEA, CFD) to validate and optimize designs
  • Design and analyze complex mechanical assemblies
  • Integrate mechanical, electrical, and control systems into cohesive plant-level solutions
  • Oversee prototype fabrication, assembly, and testing, both in-house and with external partners
  • Develop fixtures, tooling, and manufacturing aids to streamline build and test operations
  • Continuously optimize designs for manufacturability and deployment speed, balancing performance with cost and scalability
  • Operate autonomously, driving projects from concept to reality in a startup culture that values speed, ingenuity, and accountability

    • Qualifications

  • Bachelor’s degree in Mechanical Engineering or a related field (advanced degree a plus)
  • 4+ years of hands-on mechanical design and analysis experience in high-growth, high-urgency environments (startup or advanced manufacturing preferred)
  • Deep proficiency with CAD tools (SolidWorks, AutoCAD, or equivalent)
  • Demonstrated expertise in FEA and CFD using software such as ANSYS, LS-DYNA, Nastran, or similar.
  • Strong foundation in materials science, stress analysis, and thermal/fluid systems
  • Proven ability to turn concepts into tested prototypes quickly, with minimal oversight
  • Exceptional communication and collaboration skills, especially when interfacing with executives and cross-functional teams
  • A bias toward action, creative problem solving, and the drive to own complex problems end-to-end

    • Skills

    AnsysAutoCADCADCFDFEALS-DynaMaterials ScienceNASTRANPrototypingSolidWorks

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