Senior Mechanical Design Engineer

About Aalo Atomics Aalo Atomics is pioneering a new era in clean energy with factory-fabricated microreactors designed to deliver affordable, scalable, and reliable nuclear power. Our mission is to make nuclear energy globally accessible, starting with the Aalo-1, a 10 MWe reactor leveraging cutting-edge safety, modularity, and efficiency. Based in Austin, TX, we’re rapidly growing as we work to deploy the world’s first fleet of advanced microreactors. Join us and help revolutionize energy for a sustainable future. About the Role As a Senior Mechanical Design Engineer at Aalo Atomics, you will own the mechanical design of critical systems and structures within our modular nuclear reactors. You will lead design efforts from concept through detailed design, analysis, and into production — driving technical decisions, mentoring junior engineers, and ensuring our reactor modules meet the highest standards of safety and performance. This is a high-ownership role for an experienced engineer ready to shape the mechanical architecture of next-generation nuclear systems. Responsibilities Lead the mechanical design of major reactor module subsystems, from concept through production release Own design decisions and defend technical trade-offs to cross-functional stakeholders Perform and direct engineering analyses (structural, thermal, fatigue, seismic) to validate designs Develop detailed 3D models, complete with model-based definition and engineering drawings where required, with complete GD&T Drive design reviews and ensure rigorous documentation of design rationale Collaborate with manufacturing engineers to incorporate DFM / DFA principles Mentor junior engineers and establish best practices for the mechanical design team Question and refine design requirements to ensure they are necessary, clear, and achievable Support prototype builds and testing to validate design intent, feeding lessons learned back into the design Create and maintain design documentation, including specifications, BOMs, and interface control documents Basic Qualifications Bachelor's degree in Mechanical Engineering or a related engineering discipline 7+ years of professional mechanical design experience Expert proficiency with 3D CAD tools (e.g., SolidWorks, NX, or similar) Demonstrated experience owning the full design lifecycle — concept through production Strong command of GD&T, tolerance analysis, and drawing standards Experience with FEA or other structural/thermal analysis tools Proven ability to lead technical projects and make sound engineering judgments independently Preferred Experience Experience designing pressure vessels, structural weldments, or high-temperature mechanical systems Working knowledge of ASME Boiler & Pressure Vessel Code (Section III or Section VIII) Experience with nuclear-relevant design standards or other highly regulated industries (AS9100, ISO13485, etc.) Experience designing and fabricating with stainless steel, high-nickel alloys, or other high-performance materials Track record of transitioning complex designs from prototype to production Experience mentoring engineers or leading a small design team Familiarity with configuration management and change control processes Working knowledge of calculation software and use of AI Strong communication skills to convey technical reasoning to both engineering and non-engineering audiences Physical Requirements Comfortable working on the factory floor alongside technicians and welders to support builds Ability to lift up to 25 lbs and stand for extended periods Ability to focus and operate effectively in a dynamic shop environment Requirements: Based in the United States Willing to work on-site in Austin, TX What We Offer: Competitive salary starting at $130,000 Health, Dental, Vision Insurance Paid Time Off Corporate Gym Membership Additional Information: Aalo Atomics provides a collaborative and supportive work environment, opportunities for professional growth, intellectually chall