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

El Segundo, California, United States

Radiant Logo
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

Fluid Systems
Mechanisms
Structures
Mechanical Design
Analysis
Testing
CAD
FEA

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.

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