Senior Mechanical Engineer

Job description

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