Senior Mechanical

About UsAt Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, elevate global living standards, and expand humanity's presence in outer space. To achieve our mission, we’re building mass-producible, inherently safe, deployable microreactors that can be used terrestrially, underwater, and in space.About the TeamAs a Heat Transfer Systems Responsible Engineer you will play a critical role in the development, design, and implementation of advanced heat pipe systems for cutting-edge nuclear microreactors. This position requires a deep understanding of thermal engineering and heat transfer in extreme environments, with a focus on reliability, safety, and efficiency. The ideal candidate will drive innovation and ensure the highest standards in nuclear heat pipe technology, contributing to next-generation sustainable energy solutions.Roles & Responsibilities:Lead the design, modeling, and analysis of heat pipe systems, ensuring compatibility with R1’s core design, interfaces, and power conversion systemsDevelop manufacturing methods for prototyping and mass manufacturingDevelop test articles, stands, and procedures for validating the limits of heat pipe performance and life characteristicsInterface with core, containment vessel, and primary heat exchanger parts and owners to integrate heat pipes into the overall R1 systemDefine operating procedures and limits for reactor control system integrationInvestigate heat pipe failure and define reliability limits; integrate fixes rapidlyBasic Qualifications:Bachelor’s degree in Mechanical / Aerospace Engineering, Nuclear Engineering, or a related physics-based fieldMinimum of 5+ years of experience in thermal engineering, with a focus on heat pipes or heat transfer systems, preferably in nuclear or high-reliability sectors.Proficiency in thermal modeling software (e.g., COMSOL, ANSYS)Knowledge of materials science as it applies to alloy selection for heat transfer and structural propertiesPreferred Skills and Experience:Master’s or PhD in Nuclear Engineering, Thermal Sciences, or Mechanical / Aerospace EngineeringDemonstrated expertise in heat pipe design, analysis, manufacturing, or testStrong understanding of nuclear safety standards, testing protocols, and regulatory requirements5+ years of experience in nuclear thermal or other high temperature (500°C+) systems, including prior work with heat pipe technologyExperience with sodium purification and material handlingExceptional communication skills to work effectively across teams and convey technical information to non-specialistsLocationWe are located in Torrance, CA in a 145,000 square foot, brand new facility featuring large open spaces for team collaboration, R&D, and production, as well as easy access to the 405, 105, and 110 freeways. Our facility is in the heart of Los Angeles' vibrant emerging tech ecosystem alongside many other high growth startups and enterprises.CultureAt Antares, we like to specifically tie each role to our founding document’s set of values–here are the top five cultural values we think you should believe at your core to be successful:Think in Systems - Energy and Defense are complex ecosystems with numerous stakeholders with competing priorities, conflicting policies, perverse incentives, and emergent and path-dependent properties. First principles thinking alone is insufficient. Think probabilistically and then take action. “If you want to be certain, then you are apt to be obsolete.” Over-optimizing the components often degrades the system.Obsess over the End User - The customer and end user are often not the same. We will never build globally competitive commercial products if we lose sight of our end users and their entire interaction with the product life cycleBe Unconstrained by Convention - Our only limits are the laws of physics. Many, even experts, will say what we are working on is impossible. They said the same about SpaceX reusing rockets. Generationally impactful companies, by definition, must accomplish the seemingly impossible. If it were easy, it would have already been done. Never shy away from a solution because it has never been tried before, and never choose to do something because it has never been done or tried before.Craftsmen - We also focus on the inputs. We aspire to high-quality engineering for its own sake. As such we invest in personal growth, learning, and developing a long-term career path for exceptional individual contributors. We embrace a beginner’s mindset, share knowledge, and never condescend the curious.Loyally Collaborative - Team > Self. We win together. There is nothing more precious as high-performing team.Equal OpportunityAntares is an Equal Opportunity Employer. Employment decisions are based solely on merit, competence, and qualifications, without regard to race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability, or any other legally protected status.ITAR RequirementsTo conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State. Learn more about the ITAR here. #J-18808-Ljbffr