Mechanical Engineer - 2026 New Grad (Fluid Systems, Mechanisms, or Structures) at Radiant

El Segundo, California, United States

Apply Now

Not SpecifiedCompensation

Entry Level & New GradExperience Level

Full TimeJob Type

UnknownVisa

Nuclear EnergyIndustries

Requirements

BS in Mechanical Engineering, Aerospace Engineering, or a related discipline (completed or expected Spring 2026)
Strong foundation in engineering first principles, including thermodynamics, fluid mechanics, statics, dynamics, and strength of materials
Hands-on experience in design and build through projects, research, labs, or internships
Proficiency with engineering tools (e.g., CAD, analysis software, lab instrumentation)
This role is based onsite at Radiant’s HQ in El Segundo, CA
Extended hours or occasional weekend work may be required to support project milestones

Responsibilities

Contribute to the design, analysis, and testing of KDU subsystems (fluid systems, mechanisms, or structural components)
Take ownership of deliverables from concept through build and validation, with guidance from senior engineers
Collaborate across disciplines to integrate designs and resolve technical challenges
Support system-level testing, troubleshooting, and design iteration to accelerate KDU development
Communicate results through design reviews, technical reports, and presentations to peers and leadership

Skills

Key technologies and capabilities for this role

Fluid SystemsMechanismsStructuresMechanical DesignAnalysisTestingCADFEA

Questions & Answers

Common questions about this position

What degree is required for this Mechanical Engineer position?

A BS in Mechanical Engineering, Aerospace Engineering, or a related discipline (completed or expected Spring 2026) is required.

What are the key skills needed for this role?

Candidates need a strong foundation in engineering first principles including thermodynamics, fluid mechanics, statics, dynamics, and strength of materials, plus hands-on experience in design and build, and proficiency with engineering tools like CAD and analysis software.

Is this a remote position or does it require being in the office?

This information is not specified in the job description.

What is the compensation or salary for this role?

This information is not specified in the job description.

What kind of company culture can I expect at Radiant?

Radiant offers a fast-paced, startup environment with a collaborative, mission-driven mindset, where you'll work alongside a cross-disciplinary team of engineers on cutting-edge nuclear projects.

Radiant

Develops compact nuclear microreactors for energy

About Radiant

Radiant Nuclear develops compact nuclear microreactors aimed at providing reliable and sustainable energy solutions, especially for remote locations and military applications. Their main product, the Kaleidos microreactor, utilizes a CO2 cycle for energy production, allowing for a smaller and more portable reactor that can be deployed in challenging environments. Radiant differentiates itself from competitors by leveraging expertise from veterans of SpaceX and other high-tech industries, focusing on advanced technology in the nuclear energy market. The company's goal is to transform the nuclear energy sector by commercializing its microreactor technology and securing government contracts, such as those with the Department of Defense, while also seeking partnerships with private sector companies to enhance growth.

El Segundo, CaliforniaHeadquarters

2019Year Founded

$151.5MTotal Funding

SERIES_CCompany Stage

Government & Public Sector, EnergyIndustries

51-200Employees

Benefits

Health Insurance

Dental Insurance

Vision Insurance

Stock Options

Unlimited Paid Time Off

One Medical

Risks

Public opposition to nuclear energy may hinder Radiant's market acceptance.

Regulatory delays from the Nuclear Regulatory Commission could impact Radiant's timelines.

Competition from cheaper solar and wind technologies may affect Radiant's market share.

Differentiation

Radiant's Kaleidos microreactor offers zero-emissions power for remote and critical applications.

The company leverages expertise from SpaceX veterans for advanced nuclear technology development.

Radiant's CO2 cycle technology enables compact, efficient, and portable nuclear power solutions.

Upsides

Radiant raised $100M in Series C funding to develop commercial microreactors.

The U.S. Department of Defense awarded Radiant $3.8M for turbomachinery development.

Growing demand for sustainable energy in data centers boosts Radiant's market potential.

Land your dream remote job 3x faster with AI

Try Jobo Free