Senior Software Engineer

C12; Paris; Sur place; EUR 60 000 - 78 000; Plein temps

Avantages offerts par ce poste

Stock options

Conference trips

Meal vouchers

Mental health support

Training budget

Sabbatical leave

Office culture

Résumé du poste

C12 Quantum Electronics, based in Paris, is seeking a seasoned backend software engineer to drive the core quantum measurement software framework. You will collaborate with R&D and engineering teams to translate complex experimental needs into scalable software solutions and define architecture for instrument control and data storage.

You will own the full software lifecycle, champion best practices, and mentor engineers in a fast-growing, international environment in Paris’ Panthéon district.

Qualifications

• 5+ years of experience building robust backend systems or data-intensive applications.
• Python as a primary language; eager to master ecosystem if coming from another background.
• Experience with message brokers (RabbitMQ, ZeroMQ, Kafka) and relational databases (PostgreSQL), SQLAlchemy, etc.
• Prior experience with orchestration tools like Prefect or Airflow is a strong plus.
• Background in physics, engineering, or another quantitative field is a strong plus.
• Curious, adaptable, ready to discover new languages/frameworks/apis.
• Problem solver who uses the best tool for the job.
• Clear English communication and collaborative development environment.

Responsabilités

• 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.

Connaissances

Backend systems

Python programming

Problem solving

Mentoring

English communication

Formation

Background in physics or engineering

Outils

RabbitMQ

ZeroMQ

Kafka

PostgreSQL

SQLAlchemy

Prefect

Airflow

Description du poste

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 over €25 million in funding, published 11 scientific papers, and secured 8 patents. Today, our fast-growing team of 80+, including 25 PhDs, has over 26 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.

Key responsibilities:

• 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:

• 60,000 euros - 78,000 euros yearly base salary
• Stock options for every employee (BSPCE/ESOP)
• Sponsored trip to conferences around the world
• A highly dynamic international team
• Swile meal vouchers
• Mental health support with moka.care
• Training budget/ Annual Learning & Development Allowance
• Sabbatical leave (after 2 years in the company)
• Vibrant office culture (two office spaces in the heart of Paris, team lunches, offsite events, Friday breakfasts..)

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 team of 80+ people 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

We still encourage even if you don’t meet all the requirements. Rest assured, we are committed to finding the right fit for our team and are open to adjusting compensations based on skills and experiences.

Applications from women are especially welcomed!

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.