Radiant Nuclear
radiantnuclear.com
Actively hiring
Nuclear Energy
View 74 jobs
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Overview
Connections
News
Technologies
Salaries
Products
People
Growth
Offices
Jobs
Financials
Funding and backers
Team
201-500
employees, estimated range
Hiring now
92
+22 posted in 30 days
Grants
$1.5M
3 grants · CORDIS
Backers
7
Andreessen Horowitz, Crosscut Ventures
Momentum
20/100
hiring for its size, a new city
Last sign of life
this month
a posting or a news item
The story so fareach stage dated by its source: the company's releases, the press, registers, filings
Jul 31, 2025
On the Hacker News front page Kaleidos – A portable nuclear microreactor that replaces diesel generators · 117 points
Feb 8, 2023
Won a grant $1.2M · CORDIS
Jun 27, 2022
Won a grant $199k · CORDIS
Apr 19, 2021
Won a grant $45k · CORDIS
2020
Founded
Tractionpublic signals, read monthly
Web presence
top 2%
of 133.2M domains by links, Common Crawl
Hacker News stories
5
best: 117 points
Funding rounds
Backed byfrom the funds' portfolios and accelerator catalogs
Andreessen Horowitz 
Crosscut Ventures 
DCVC 
Felicis 
gigascale 
Nucleation Capital 
Union Square Ventures Investors in similar startupsfunds that back the companies most like this one
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Factory-built nuclear plants delivered in 3 years at $5k/kW. Blue Energy makes nuclear power financeable and repeatable on a global scale.
How Radiant Nuclear hires
Truth index
A 87/100
Median time to fill
53 days
Ghost roles
0%
Stale roles
54%
Reposted roles
0%
Radiant Nuclear scores A on the Alion truth index (A is best, E worst), measured over 26 open roles re-checked against its own hiring board: 0% look like ghost listings, 54% have gone stale and 0% are the same role posted again. Its roles close in a median of 53 days. It measures how much of what this employer publishes turns into a real, finite search - not the employer as a workplace. How the index is computed
Overview
Radiant Nuclear, legally Radiant Industries, is a nuclear energy startup based in El Segundo, California, that designs portable, factory-built microreactors meant to replace diesel generators at hospitals, data centers, remote sites and military bases. Founded in 2020, the company is developing Kaleidos, a 1-megawatt fail-safe microreactor that can be transported by road and run for up to five years without refueling, with testing planned at Idaho National Laboratory and first customer deliveries targeted for 2028. It hires mechanical, turbomachinery, power electronics, electrical, embedded software, manufacturing and reactor operations engineers plus regulatory and government affairs staff.
Connections
List
Graph
Found in company registers, site code, DNS and hiring. Each connection shows how sure we are and the evidence, with its source and date.
Shared investors
Show all 5 Click a company to open it. Dashed lines are likely connections. The second step of the network is part of the Pro plan.
Owner
Same company
Same group
Likely
Tech stack
Technologies named in job postings at Radiant Nuclear over the last 12 months, by layer, with the share of postings for each.
Technologies in use
80
Postings analysed
84
Stack modernity
64/100
Languages
Python32%
C++13%
C#10%
MATLAB10%
Frameworks & libraries
NuttX1%
PixiJS1%
Playwright1%
React Router1%
Cloud & platforms
RTOS2%
AWS1%
Active Directory1%
DLP1%
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Full Radiant Nuclear tech stack
80 technologies · by team · pay by technology · changes · similar stacks
Salary insights
Compensation ranges based on this company's open jobs
Median
$194k
Typical range
$118k – $314k
Open positions
92
91
Jobs
Junior
11%
Middle
12.1%
Senior
50.5%
Staff
14.3%
Principal
6.6%
Architect
5.5%
| Level | Jobs | Median | Typical range |
|---|---|---|---|
| Junior | 10 | $146k | $118k – $190k |
| Middle | 11 | $168k | $118k – $185k |
| Senior | 46 | $194k | $122k – $284k |
| Staff | 13 | $224k | $168k – $314k |
| Principal | 6 | $314k | $263k – $314k |
| Architect | 5 | $256k | $236k – $258k |
Highest paying role
Principal Power Systems Engineer
$314k
Normalized to USD per year
All salaries at Radiant Nuclear
By role, level and city, against the market · 92 jobs with pay
Growth
Hiring Momentum
69/100
Growing
Open positions
92
18 opened / 22 closed in 30 days
Median time-to-fill
43 days
faster than 31% of the market
ATS activity
Every ~4 hours
Today
Hiring Dynamics
+100%
Hiring Focus
The percentage next to each role is its share of the company's job openings over the last 90 days; the arrow shows the shift versus the previous period.
Industrial Engineering
44%
Energy
17% ▼
Operations
13% ▲
Hardware
5%
Finance
4% ▲
DevOps
3% ▼
Actively hiring for Industrial Engineering (+9 in 30 days)
Activity Timeline
Added QuickBooks to stack
Oct 2026
Added Oracle ERP to stack
Oct 2026
+6 jobs in a week
Oct 2026
Added SOAP to stack
Oct 2026
Added Rest API to stack
Oct 2026
Added ETL/ELT to stack
Oct 2026
Added Smartsheet to stack
Oct 2026
Added Microsoft Project to stack
Oct 2026
Added Microsoft Excel to stack
Oct 2026
Added Vitest to stack
Oct 2026
Added Defense in Depth to stack
Oct 2026
New location: Oak Ridge
Oct 2026
Offices
Where the company hires and what each office is for
Cities
3
Hiring now
3
Countries
1
Busiest office
El Segundo
Loading the map
Headquarters
Builds here
Office with open vacancies
Tap a pin for the office
El Segundo
United States
HQ
90 open roles 74 posted in 90 days 18% engineering 200-500 est. staff $204k Avg Salary
hires for Industrial Engineering, Energy, Hardware
1921 E Maple Ave
Washington
United States
Plant / site
5 open roles 3 posted in 90 days 10-50 est. staff $204k Avg Salary
hires for Public Policy, Administrative, Biotech
601 New Jersey Ave NW, Washington, DC 20001, Suite 320
Oak Ridge
United States
1 open roles 1 posted in 90 days 1-10 est. staff $191k Avg Salary
hires for Operations
1921 E Maple Ave
Jobs
$115k – $168k per year · Equity · In office · Full-Time · 3+ years exp · Bachelor's Degree · El Segundo
AS9100
GD&T
Energy
ASME NQA-1
Apply
$123k – $173k per year · Equity · In office · Full-Time · 7+ years exp · Bachelor's Degree · El Segundo
AS9100
GD&T
Energy
ASME NQA-1
Apply
$169k – $208k per year · Equity · In office · Full-Time · 7+ years exp · Bachelor's Degree · El Segundo
Femap
Abaqus
ANSYS
GD&T
FMEA
Apply
$134k – $185k per year · Equity · In office · Full-Time · 6+ years exp · Bachelor's Degree · El Segundo
Femap
Abaqus
ANSYS
GD&T
FMEA
Apply
$134k – $185k per year · Equity · In office · Full-Time · 5+ years exp · Bachelor's Degree · El Segundo
Abaqus
ANSYS
GD&T
FMEA
Apply
$134k – $185k per year · Equity · In office · Full-Time · 5+ years exp · Bachelor's Degree · El Segundo
Abaqus
ANSYS
GD&T
FMEA
Apply
$134k – $185k per year · Equity · In office · Full-Time · 6+ years exp · Bachelor's Degree · El Segundo
Femap
Abaqus
ANSYS
GD&T
FMEA
Apply
$201k – $314k per year · Equity · In office · Full-Time · 8+ years exp · Bachelor's Degree · El Segundo
Apply
$158k – $219k per year · Equity · In office · Full-Time · 5+ years exp · Bachelor's Degree · El Segundo
Apply
$107k – $146k per year · Equity · In office · Full-Time · 2+ years exp · Bachelor's Degree · El Segundo
Python
Apply
$115k – $168k per year · Equity · In office · Full-Time · 3+ years exp · Bachelor's Degree · El Segundo
SQL
Rest API
SOAP
Analytics
ETL/ELT
Management
Agile
Oracle ERP
Apply
$150k – $212k per year · Equity · In office · Full-Time · 5+ years exp · Bachelor's Degree · El Segundo
Verification & Validation
Energy
MCNP
RELAP5
MELCOR
NRC Licensing
Apply