Prinicpal Engineer, Structural Integrity

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.

The Antares team hails from SpaceX, the White House, the Pentagon, the Department of Energy, MIT, Rigetti Computing, General Atomics, Relativity Space, Ursa Major, and National Laboratories like Idaho, Oak Ridge, Los Alamos, and Savannah River. Antares has raised over $600M in venture capital from top-tier investors and has hundreds of million-dollars on contract with the military services, NASA, and the Department of Energy.

As a Principal Engineer, Structural Integrity you will build and own our structural integrity methods and tools for high-temperature reactor components (including heat pipes). This individual will connect material behavior, testing, modeling, code requirements, and actual component integrity, and establish that capability as a long-term technical foundation for Antares. This role will be part of larger Nuclear Methods and work closely with Materials, Mechanical Design and Analysis, Safety Analysis, Licensing, Quality, and Operations.

The focus is primarily metallic materials, but graphite experience is highly valuable.

• Build and own the Antares structural integrity framework covering design, qualification, operation, inspection, aging, and fitness for service.

• Serve as the technical authority for structural integrity and materials modeling across Antares.

• Lead application of equivalency applicable ASME Section III, Division 5 for high-temperature components.

• Bring relevant R5 and R6 methods into the Antares framework for high-temperature life assessment, fracture, defect tolerance, and remaining life.

• Translate material test data into qualified material models, design properties, allowables, and acceptance criteria used in structural analysis.

• Develop and qualify methods for creep, fatigue, creep-fatigue, ratcheting, thermal aging, irradiation effects, fracture, and crack growth.

• Define the material testing and irradiation data needed to support current design decisions and longer-term qualification.

• Connect material behavior and test results directly to design margins, inspection requirements, and allowable operating life.

• Establish methods for evaluating manufacturing defects, inspection findings, degradation, and fitness for continued service.

• Support aging management, surveillance, remaining-life assessment, and asset-management strategies.

• Own the technical basis, verification, validation, uncertainty, and qualification approach for structural and materials modeling methods.

• Guide and mentor engineers across materials and structural analysis and help set the long-term technical direction for the capability.

• Principal or Distinguished-level engineer with deep expertise in structural integrity, materials modeling, or high-temperature component design.

• Demonstrated ability to establish technical methods and frameworks used across an organization.

• Strong understanding of metallic behavior under temperature, time, irradiation, and cyclic loading.

• Deep experience with creep, fatigue, creep-fatigue, fracture, crack growth, and nonlinear structural analysis.

• Significant experience with ASME Section III, preferably Division
  5. Additionally, exposure to Sec 11 rules/practices

• Experience taking material testing output and turning it into models, design curves, allowables, or…