C12
c12qe.com
Actively hiring
Quantum Computing Hardware
Quantum Science & Computing
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Overview
News
Technologies
Salaries
Products
People
Growth
Offices
Jobs
Financials
Funding and backers
Team
51-200
employees, estimated range
Hiring now
10
+3 posted in 30 days
Momentum
12/100
hiring for its size
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
2020
Founded
Tractionpublic signals, read monthly
Web presence
top 2%
of 133.2M domains by links, Common Crawl
Hacker News stories
1
best: 24 points
Investors in similar startupsfunds that back the companies most like this one
backs Quandela, Nord Quantique
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How C12 hires
Truth index
A 94/100
Median time to fill
56 days
Ghost roles
10%
Stale roles
0%
Reposted roles
0%
C12 scores A on the Alion truth index (A is best, E worst), measured over 10 open roles re-checked against its own hiring board: 10% look like ghost listings, 0% have gone stale and 0% are the same role posted again. Its roles close in a median of 56 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
C12 is a quantum computing hardware company headquartered in Paris, France, and founded in 2020 by twin brothers Matthieu and Pierre Desjardins. The company builds spin qubits from ultra pure carbon nanotubes suspended over silicon chips, an approach intended to reduce the noise that limits conventional solid state qubits. It works with research institutions and industrial partners in Europe and manufactures its devices using semiconductor compatible processes.
News
Pick & Place: C12's Carbon Nanotube Nanoassembly Process
C12 announces Pick & Place, a patented nanoassembly process that places individual carbon nanotubes on chips with micrometric precision, enabling scalable quantum processor manufacturing.
Read more
Report
Tech stack
Technologies named in job postings at C12 over the last 12 months, by layer, with the share of postings for each.
Technologies in use
28
Postings analysed
11
Stack modernity
76/100AI adopter
Languages
Python91%
MATLAB27%
C9%
Frameworks & libraries
Rest-Assured27%
LangGraph18%
LangChain18%
SQLAlchemy9%
Databases
PostgreSQL9%
Cloud & platforms
Prefect27%
OVHcloud18%
Ollama18%
vLLM18%
AI & ML
LLM18%
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Full C12 tech stack
28 technologies · by team · pay by technology · changes · similar stacks
Growth
Hiring Momentum
68/100
Growing
Open positions
10
2 opened / 3 closed in 30 days
Median time-to-fill
62 days
faster than 21% 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.
AI/ML
22% ▼
Early Careers
22% ▲
Backend
11% ▲
Hardware
11% ▼
Quantum
11% ▼
Operations
11% ▼
Activity Timeline
Added VPN to stack
Sep 2026
Added C to stack
Sep 2026
Added ZeroMQ to stack
Sep 2026
Added SQLAlchemy to stack
Sep 2026
Added RabbitMQ to stack
Sep 2026
Added PostgreSQL to stack
Sep 2026
Added CI/CD to stack
Sep 2026
Added Apache Kafka to stack
Sep 2026
Added Tool Use to stack
Sep 2026
Added AI Agents to stack
Aug 2026
Added n8n to stack
Aug 2026
Added MATLAB to stack
Aug 2026
Offices
Where the company hires and what each office is for
Cities
1
Hiring now
1
Countries
1
Busiest office
Paris
Paris
France
HQ
Partners in precision
10 open roles 9 posted in 90 days 50% engineering 50-200 est. staff $78k Avg Salary
hires for Science & Research, Early Careers, Backend
26 rue des Fossés Saint-Jacques, 75005 Paris
Jobs
≈ $51k – $87k per year (Estimated) • Hybrid • Full-Time • 5+ years exp • Paris
Python
C
SQLAlchemy
C
ZeroMQ
Databases
PostgreSQL
RabbitMQ
Apache Kafka
AI/ML
Prefect
DevOps
CI/CD
Apply
≈ $59k – $103k per year (Estimated) • In office • Full-Time • 5+ years exp • Master's Degree • Paris
Python
MATLAB
Apply
Apply