
Climate · El Segundo, California
Radiant
Radiant develops mass-produced portable nuclear microreactors, with its flagship Kaleidos product delivering 1 MW of failsafe power for diverse locations, targeting customer deployments by 2028.
Backed by Draper Associates, ARK Venture Fund, Boost VC and 11 more
Work at Radiant?
- Locations
- El Segundo+3
- Also United States, Los Angeles, Oak Ridge
- Team size
- 201-500
- Founded 2020
- Total raised
- $694.8M
- Series D · last round Dec '25
- Salary range
- $74–314k
- + equity · 88 of 89 roles
- Open roles
- 89
Open positions · 89
About Radiant
Radiant is a nuclear technology company founded in 2020 that is developing mass-produced portable nuclear microreactors to deliver power where it is needed. The company's flagship product, Kaleidos, is a 1 MW failsafe microreactor designed for transportability and deployment in diverse locations. Radiant plans to conduct testing of its first reactor in 2026, with initial customer deployments expected to begin in 2028.
Funding
$694.8Mtotal raised
- Dec 2025 · Series DDraper Associates, Boost VC, Founders Fund, Friends & Family Capital, Chevron Technology Ventures, ARK Venture Fund$300M
- May 2025 · Series C$165M
- Feb 2025 · Series C$66M
- Nov 2024 · Series C$100M
- Draper Associates

- ARK Venture Fund

- Boost VC

- Chevron Technology Ventures

- Founders Fund

- Friends & Family Capital

- Also Capital

- Andreessen Horowitz

- +6 more
Company at a glance
The team at Radiant
201-500 peopleSee everyone on LinkedIn
Team breakdown
Team Distribution
- Engineering76%
- Specialized14%
- Sales & Business Development5%
- Operations5%
Where the Team Studied
- 1.University of California, Los Angeles
- 2.Northeastern University
- 3.Caltech
- 4.Purdue University
- 5.Georgia Institute of Technology
Team Worked At
- SpaceX
- Northrop Grumman
- NuScale Power
- Aerojet Rocketdyne
- Ultra Safe Nuclear
Location
Team Composition
237 people- Engineering and Technical9 senior136
- Operations3 senior30
- Human Resources2 senior16
- General Management4 senior8
- Sales3 senior7
- Finance & Accounting2 senior6
- Legal2 senior4
- Marketing2 senior4
Life at Radiant
Frequently asked questions
Of 89 open roles, Radiant has 89 on-site positions.
Radiant is based in Los Angeles, El Segundo.
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