Senior Civil / Structural Engineer

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, Ultra Safe Nuclear, and Los Alamos National Laboratory. Antares has raised over $39M in venture capital from top-tier investors and has over $4M in government funding. 

About the Team

The Senior Civil/Structural & Seismic Engineer works closely with our product teams—particularly those designing reactor enclosures, foundations, and site facilities. This role is key to ensuring our microreactors meet the natural phenomena hazards design criteria (e.g., seismic, wind, flood), plus site/facility engineering requirements and best practices. You’ll translate civil/structural design solutions into engineering documentation and ensure alignment with regulatory expectations. Collaborating with product engineering, you’ll help shape robust and compliant reactor infrastructure from concept through final design reviews.

Roles and Responsibilities:

• Evaluate and advise on structural loads, seismic design categories, and foundation layouts for transportable microreactors.

• Review and refine civil/structural drawings at conceptual, preliminary, and final design stages in accordance with regulatory specific specifications.

• Provide real-time feedback on load paths, anchorage, and site-specific solutions (e.g., desert vs. maritime environment).

• Own relevant inputs to the Documented Safety Analysis (DSA) for civil/architectural, structural integrity, earthquake/flood/wind hazard analysis.

• Respond to regulator inquiries (NRC, DOE) about civil/structural codes, site conditions, and anchorage methods.

• Prepare design deliverables demonstrating compliance with site hazards analyses and structural safety margins.

• Ensure that each stage of design review (30%, 60%, 90%) properly documents structural load cases, geotech data, and seismic analysis.

• Maintain consistent code interpretations across the organization.

Basic Qualifications:

• Bachelor’s degree in Civil or Structural Engineering (or a related Engineering or Physics discipline).

• 5+ years of experience in structural design or analysis for complex projects (e.g., energy, aerospace, or industrial).

• Familiarity with seismic design standards (e.g., ASCE/SEI 7, DOE-STD-1020) and civil/structural codes.

• Hands-on experience preparing or reviewing design drawings, calculations, and site plans.

Preferred Skills & Experience:

• Master’s degree in Civil or Structural Engineering or related field.

• Prior experience in nuclear or highly regulated environments, with knowledge of seismic qualification for facilities.

• Experience liaising with government or regulatory bodies for site permitting or hazard classification.

• Proficiency in advanced structural analysis software (e.g., ANSYS, SAP2000) and geotechnical evaluation.

• Excellent communication skills to convey design rationale and regulatory compliance in cross-functional teams.

Additional Requirements:

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

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” 

• 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 than a high-performing team

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.