Test Engineer, Numenor (Reactor)

About Valar Atomics

At Valar Atomics, we're redefining what's possible in energy. Our mission is to make clean, high-temperature nuclear power scalable—unlocking abundant energy for industry, hydrogen, and next-generation manufacturing. We are a team of builders, engineers, and operators who believe nuclear energy should be fast to deploy, factory-made, and built for the real world. Our first pilot plant in Orangeville, Utah will demonstrate how advanced nuclear systems and fuel fabrication can power the future. Joining Valar Atomics means becoming part of a company where autonomy, ownership, and impact exist at every level.

The Team

The Numenor team is building Valar’s next reactor, the flagship program that will define how we deliver nuclear power at scale. This dedicated team owns the entire plant, from the reactor core and helium systems to cooling, plant modules, and the Citadel, uniting mechanical, systems, safety, IC&E, quality, and supply chain under one mission. The work starts with bringing the first unit to life and ends with a production line that delivers reactors faster with every build. What this team builds will power the critical infrastructure of the future.

The Role

Valar Atomics seeks a Test Engineer for the reactor program. This role will design and build test stands, run test campaigns, and turn raw data into the evidence that proves Numenor’s hardware meets its design basis. You will test components and systems such as control rod mechanisms, helium systems, and plant modules, from early development through integrated testing and commissioning on the first unit, then help build the repeatable acceptance testing that lets every unit after it ship faster.

The role sits at the intersection of hardware, data, and compliance, and demands someone who is hands-on and hardware-first while bringing the rigor and traceability that nuclear work requires.

Key Responsibilities

Test Stand Design and Execution

Design, build, and maintain test stands for performance, reliability, endurance, environmental, and qualification testing.

Develop test plans, profiles, and procedures with design engineers and the V&V team.

Run tests, monitor live data, and adjust parameters to capture meaningful results.

Data Acquisition and Integration

Set up and maintain data acquisition systems, including remote and unattended capability.

Integrate test stand data streams with SCADA and historian infrastructure.

Process raw test data into clean, usable formats for engineering analysis and reporting.

Troubleshooting and Diagnostics

Troubleshoot instrumentation, test stand hardware, and data acquisition faults during test execution.

Analyze test data to diagnose root causes and turn findings into design recommendations.

Build, Test and Commissioning

Support integrated system testing and commissioning through first operation.

Develop standardized acceptance tests so each unit is verified faster than the last.

Reporting and Compliance

Prepare clear, accurate test reports and maintain traceable records of procedures, configurations, and results.

Present test results and methodology to government regulators and auditors as needed.

Work closely with mechanical, systems engineering, safety, IC&E, and quality so test results feed directly into the plant design.

Basic Qualifications

Bachelor’s degree in Mechanical, Electrical, or Aerospace Engineering or a related field, or equivalent hands-on experience.

2+ years of test engineering experience on hardware.

Experience designing and building test stands or test fixtures.

Familiarity with data acquisition systems, sensors, and instrumentation.

Working knowledge of Python, MATLAB, SQL, or similar tools for data handling and analysis.

Strong troubleshooting mindset, with the ability to diagnose issues from data.

Clear written and verbal communication, including presenting technical results to non-technical or regulatory audiences.

Preferred Skills and Experience

Experience with SCADA and historian systems.

Testing of high-temperature, high-pressure, or gas systems, such as helium, pressure vessels, or heat exchangers.

Mechanism, actuator, or qualification testing.

Test experience on first-of-a-kind hardware in aerospace, power generation, oil and gas, or defense.

Experience preparing documentation for regulatory review or compliance audits.

Nuclear industry experience: commercial, defense, or national laboratory. A plus, not a prerequisite.

What We Offer

Competitive base salary

Equity ownership in a rapidly growing advanced energy company

Comprehensive medical benefits

Unlimited PTO

Free daily lunch and dinner provided onsite

Generous PPE stipend

High-impact startup environment with significant ownership and autonomy

Opportunities for rapid career growth and internal advancement

Direct collaboration with experienced operators, engineers, and industry leaders

The opportunity to help build and scale transformative energy technology from the ground up

Equal Employment Opportunity Statement

Valar Atomics is an equal opportunity employer. We consider all qualified applicants without regard to race, color, religion, sex, gender identity, sexual orientation, national origin, age, disability, veteran status, or any other protected status under applicable law.

We are committed to providing a workplace free of discrimination and harassment and will provide reasonable accommodation as required by law.

Applicants must be legally authorized to work in the United States as a U.S. citizen or lawful permanent resident (green card holder).

Salary$110,000—$140,000 USD