C12

Software Engineer ( Quantum Measurement )

Posted 19 Days Ago

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Paris, Île-de-France

Hybrid

Senior level

Quantum Computing

The Role

As a Software Measurement Engineer, you will build backend systems and frameworks for quantum computer experiments, collaborating closely with research teams.

Summary Generated by Built In

Founded in 2020 and based in the heart of Paris, C12’s mission is to be at the center of one of the biggest technological breakthroughs of the century and change the course of history by building a universal quantum computer.

At C12, we believe that achieving a true breakthrough in quantum computing requires rethinking the fundamentals. That’s why our founders—deeply rooted in academic and engineering excellence—have chosen carbon nanotubes as the building blocks of our quantum processors. This ultra-pure material dramatically reduces error rates, boosts performance, and minimizes hardware overhead—key ingredients for scalable, fault-tolerant quantum computing. By crafting a unique approach that scales, we aim to revolutionize quantum computing just as silicon transformed classical computing.

Since our founding, we’ve raised close to €40 million in funding, published 11 scientific papers, and secured 8 patents. Today, our fast-growing team of 60, including 20 PhDs, has over 20 nationalities represented. We have our own cutting-edge lab spaces in Paris' historic Panthéon district, where scientists, engineers, and innovators work side-by-side to tackle some of the most exciting technical challenges of our time.

If you're passionate about shaping the future of quantum technology and want to make a real impact, C12 offers a unique environment to grow, learn, and innovate.

Your role at C12 Quantum Electronics :

The software team is here to assist and facilitate the work of the research teams towards building a quantum computer.

As a Quantum Software Engineer, you will be at the forefront of shaping the future of quantum measurement and help build the framework that runs experiments on quantum computers. Your expertise will drive the development and innovative solution that bridges the gaps between our R&D and engineering, enabling breakthrough in quantum technology.

Your responsibilities will include :

Lead the design and development of our core quantum measurement software framework, ensuring high performance and long-term maintainability
Partner with our R&D and other engineering teams at C12 to translate complex experimental requirements into robust, scalable software solutions
Define and document the unified architecture for instrument control, high-throughput data storage, and measurement orchestration to support framework growth
Champion rigorous software practices, including comprehensive code reviews, proactive design discussions, and robust CI/CD and automated testing pipelines
Take ownership of the full software lifecycle, delivering robust, secure, and scalable solutions that meet the rigorous demands of quantum R&D
Cultivate a culture of continuous learning by mentoring junior engineers and leading by example in code quality and system design

About You:

You have 5+ years of experience building robust backend systems or data-intensive applications
You are comfortable working with Python as a primary language; if coming from another background, you are eager to master the ecosystem
You’re familiar or comfortable working with message brokers (e.g., RabbitMQ, ZeroMQ, Kafka) and relational databases (PostgreSQL), SQLAlchemy, etc
Prior experience with orchestration tools like Prefect or Airflow is a strong plus
A background in physics, engineering, or another quantitative field is a strong plus
You are curious, adaptable, ready to discover new languages/frameworks/apis
A problem solver that tries to use the best tool for the job
You communicate clearly in English and work well in collaborative development environments

What we offer:

Stock options for every employee (BSPCE/ESOP)
Two incredible office spaces in the heart of Paris (both next to the famous Panthéon!)
Sponsored trip to conferences around the world
A highly dynamic international team
Swile meal vouchers
Vibrant office culture (team lunches, offsite events, Friday breakfasts..)
Mental health support with moka.care
Training budgets/ Annual Learning & Development Allowance
Sabbatical leave (after 2 years in the company)

You should join us if...

You like hands-on work and technology

You want to contribute to achieving landmark results in quantum computing, making a difference in the emerging quantum technologies

You want to work within a 60-people team with various backgrounds in nanofabrication, quantum electronics, and carbon nanotube science to create a revolutionary quantum computing processor

You want to thrive in an exceptional scientific environment with several industrial and academic partners

You share our values (excellence, scientific integrity, diversity, curiosity, and care) and want to help us define our product-focused culture and ambition to accelerate.

C12 encourages all who feel qualified to apply. Recruitment decisions are based solely on qualifications, skills, knowledge and experience. Applications from women are particularly welcomed.

Top Skills

Airflow

Kafka

Postgres

Prefect

Python

RabbitMQ

Sqlalchemy

Zeromq

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The Company

HQ: Paris

54 Employees

Year Founded: 2020

What We Do

C12 is building reliable quantum computers.

The company is a spin-off from ENS launched in January 2020 by twin brothers Matthieu and Pierre Desjardins to supercharge the development of the lab’s promising new quantum technology.

Quantum computing has the potential to change our lives. But frequent errors limit the technology’s viability. We are tackling the fundamental issue: the nature of the hardware itself. We are tapping into the simplest material–carbon–to drive a technological breakthrough in the field. Unlike other quantum computers, we use carbon nanotubes as the fundamental building block of our processor. By combining the power of an ultra-pure material with an easy-to-manufacture semiconductor device, we are building a scalable platform for quantum computing.

Our executive co-founders bring a unique combination of scientific excellence and business skills to the company. Our team is made up of the world’s most accomplished experts in quantum electronics and carbon nanotube science. Our scientific advisors are renowned scientists and pioneers in spin qubits: Dr. Takis Kontos, Dr. Matthieu Delbecq and Dr. Jérémie Viennot.

In June 2021, C12 secured a $10 million seed round with funding from 360 Capital, Bpifrance (Digital Venture Fund), Airbus Ventures, BNP Paribas Développement, and Octave Klaba (OVHcloud), and additional grants from Bpifrance and the Ile-de-France Region.

We are leading quantum’s next material breakthrough, and we are just getting started. Silicon enabled the emergence of classical computing – it’s time for carbon to do the same for quantum !