Senior Mechanical Engineer

@ Last Energy

Senior Mechanical Engineer

Posted 34 months ago

This job is still taking applications, but it's been up a while.

About the job

Last Energy is a US-based tech company advancing modular nuclear power plants. We focus on rapid deployment, innovative design, and scalable clean energy, transforming global energy solutions with leadership engagement and cutting-edge engineering.

Requirements

Mechanical design and analysis
Proficiency with CAD tools
Experience with FEA and CFD
Hands-on prototyping experience
Effective communication skills

Qualifications

Bachelor’s in Mechanical Engineering
4+ years in high-growth environments
Experience in manufacturing or startup
Ability to develop tested prototypes
Strong collaboration skills

Full 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

Last Energy provides decarbonized, reliable, affordable nuclear energy at scale by innovating on the delivery model, not the reactor. By significantly reducing the time and cost of deployment, we are decarbonizing global energy production, increasing access to 24/7 baseload power, and creating a scalable clean energy future for humanity.

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