Find your dream job faster with JobLogr
AI-powered job search, resume help, and more.
Try for Free
Antares

Antares

via Ashby

All our jobs are verified from trusted employers and sources. We connect to legitimate platforms only.

Senior Mechanical Design Engineer - Reactivity Controls

Los Angeles, California
Full-time
Posted 12/2/2025
Direct Apply
Key Skills:
Mechanical design
CAD
Kinematic synthesis
Pneumatic/hydraulic actuation
Mechatronics
FMEA
High-temperature materials
ANSYS
Python
MATLAB

Compensation

Salary Range

$90K - 130K a year

Responsibilities

Design, develop, test, and validate mechanical control systems for nuclear reactors, collaborating across disciplines and managing system architecture and vendor selection.

Requirements

Bachelor's degree in engineering, 5+ years full-cycle mechanical design engineering experience with CAD and analysis, preferably in nuclear, aerospace, or robotics industries.

Full Description

About Us At 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. Formed in 2023, the Antares team hails from SpaceX, The White House, MIT, Rigetti Computing, The Air Force, General Atomics, Relativity Space, Ursa Major, and National Laboratories like Los Alamos, Idaho, and Oak Ridge. Antares has raised over $130M in venture capital from top-tier investors and has over $13M in government funding. About the Role As the Responsible Engineer for Reactivity Controls – Mechanical, you will lead the design, development, testing, and validation of the mechanical systems that govern reactor reactivity and ensure the safe operation of the reactor. You will architect and build the mechanical mechanisms that interface with electrical and software subsystems, collaborating closely across disciplines to define system architecture, requirements, and documentation. The ideal candidate has a strong track record in designing and developing precision control mechanisms, preferably with experience in robotics or electromechanical systems. You will also contribute to system-level architecture trade studies and support the evaluation and selection of key vendors. Roles and Responsibilities: Design, build, and test the reactor’s control mechanisms, hardware and assemblies. Concept and develop custom actuation solutions, including mechanisms, linkages, interfaces, and instrumentation. Define design criteria, requirements, system architecture, and verification/validation test plans. Collaborate closely with cross-functional teams across thermal, structural, neutronics, controls, and simulation disciplines. Engineer components for high-temperature, high-stress, and radiation environments using metals, ceramics, and other advanced materials. Perform design-for-manufacturability (DFM) assessments and execute tradeoffs across performance, cost, schedule, and risk. Conduct mechanism trade studies, document findings, and present recommendations to senior leadership Basic Qualifications: Bachelor's degree in engineering 5+ years of experience in a full-cycle design engineering roles, encompassing hands-on experience with CAD, analysis, build and test Experience with kinematic synthesis, pneumatic/hydraulic actuation, mechatronics and instrumentation Experience with FMEA including structure strength, stability and fatigue failure modes Preferred Skills & Experience: Master's degree in engineering 7+ years of experience in a full-cycle design engineering roles, encompassing hands-on experience with CAD, analysis, build and test Experience in the Nuclear, Aerospace, or Robotics industries Experience in a demanding fast-paced development environment Experience with design engineering tools such as NX, ANSYS or Femap, and other product lifecycle software Experience with engineering scripting languages such as Python and MATLAB Additional Requirements: Ability to work long hours and weekends as necessary to support critical milestones Location We 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. Culture At 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 cycle Be 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 that's “how it's always been done” Go Where the Work Is - Never miss a chance to meet a customer, user, or stakeholder face to face, even if that means hopping on a plane. If you can’t make it, find a teammate who can channel your intentions and go in your place. Deep work can be done from anywhere, but we believe teams are built in person, and aim to maximize our time together Operate in the Grey - Embrace nuance in pursuit of truth. Question every fundamental assumption Equal Opportunity Antares 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 Requirements To 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.

This job posting was last updated on 12/5/2025

Ready to have AI work for you in your job search?

Sign-up for free and start using JobLogr today!

Get Started »
JobLogr badgeTinyLaunch BadgeJobLogr - AI Job Search Tools to Land Your Next Job Faster than Ever | Product Hunt