Materials Engineer II

antares· Reactor Hardware Engineering
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📍 Los AngelesFullTime💰 USD 115K–150K/yr

About this role

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 Team

As a Materials Engineer you will aid in the development and qualification of all
materials in Antares’ reactor systems. This will consist of developing experiments,
processes, and quality control as well as working with vendors and collaborators to
identify and rectify critical gaps in material behavior at our operating conditions.
This position requires the ability to learn quickly and develop a deep understanding
of a wide range of materials – including ceramics and metallic alloys – such that you
become the go-to subject matter expert at the company. The ideal candidate will
apply fundamental knowledge of materials science to the practical applications of
manufacturing in a fast-paced environment while also pushing innovation for the
next generation of materials – driving Antares to be a recognized leader in nuclear
materials

Roles and Responsibilities:

  • Partake in the development and qualification for all materials in the reactor,
    including lifetime testing, cross-institutional collaboration, and property
    evaluation

  • Design and conduct physical, thermal, and mechanical testing of materials
    that replicates the reactor environment

  • Employ statistical methods to systematically evaluate effects of process
    variables and environmental effects on materials properties

  • Conduct materials characterization including root cause investigations of failure
    modes

  • Interface with manufacturing, neutronics, mechanical, testing, and quality
    engineers to integrate materials into the overall system, define limits to
    operating conditions based on material properties, and optimize processes

Basic Qualifications:

  • Bachelor’s degree in Mechanical Engineering, Materials Engineering, or a
    related field

  • 3+ years of experience in materials engineering

  • Proficiency in optical or electron microscopy as well as mechanical property
    evaluation

  • Experience with Materials characterization including root cause investigations of failure
    modes

Preferred Skills & Experience:

  • 5+ years demonstrated experience as part of integrated team in a production
    setting

  • Knowledge of radiation effects in materials

  • Knowledge of stainless steel, Ni based superalloys, and ceramics

  • Knowledge of Graphite or other nuclear materials

  • Coatings experience

  • Exceptional communication skills to work effectively across teams and convey
    technical information to non-specialists

Additional Requirements:

  • Ability to work long hours and weekends as necessary to support critical milestones

Location

  • We are located in Torrance, CA in a 322,000 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.

Frequently Asked Questions

What is the salary for the Materials Engineer II role at antares?
The listed salary for this Materials Engineer II position at antares is USD 115K–150K/yr. This is an FullTime role.
Where is the Materials Engineer II position at antares located?
This Materials Engineer II role at antares is based in Los Angeles. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Is the Materials Engineer II role at antares full-time or part-time?
This is listed as a FullTime position. It is posted as a Materials Engineer II role in the Reactor Hardware Engineering department at antares.
Which team or department does the Materials Engineer II at antares belong to?
This Materials Engineer II position is part of the Reactor Hardware Engineering department at antares. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Materials Engineer II position at antares?
Click the "Apply Now" button on this page. You will be redirected to antares's official application portal hosted on ashby where you can submit your application directly.
When was the Materials Engineer II job at antares posted?
This Materials Engineer II position at antares was posted on Dec 2, 2025. Apply as soon as possible — early applications are often reviewed first.
Materials Engineer II
antares · 💰 USD 115K–150K/yr
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You'll be redirected to antares's official application page on Ashby ATS.