Job Description

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

• You will define and drive C12’s nanofabrication strategy, balancing technology development, process maturity and production needs
• You will drive yield improvement effort and the development of next-generation fabrication processes and ensure their successful introduction into production
• You will build a robust and scalable nanofabrication organization, with strong standards around process control, documentation and data
• You will lead the team through technical challenges and process deviations, ensuring fast and structured problem resolution
• You will recruit, develop and empower a growing team of nanofabrication engineers and technicians
• You will contribute to equipment strategy and tool procurement in close collaboration with Operations
• You will work closely with the CTO, Operations, Chip Design and downstream production teams to align priorities and support C12’s technology roadmap
• You will provide technical expertise for collaborations with external foundries, RTOs and fabrication partners

About you

• You have significant experience in nanofabrication and a strong understanding of advanced cleanroom processes.
• You have a proven track record of leading technical teams in complex R&D or prototyping environments.
• You are able to set direction, make trade-offs and rely effectively on domain experts.
• You are equally comfortable driving new process development and building the discipline required for robust, reproducible production.
• You bring a strong data-driven mindset and know how to build the right structures for process learning and continuous improvement.
• You are pragmatic, adaptable and effective in fast-moving environments where priorities and technical challenges can evolve quickly.
• Experience in an RTO, advanced prototyping cleanroom or similar environment is highly valued.
• Experience in quantum technologies or quantum-device fabrication is a plus.

What we offer

• 92,000 euros to 108,000 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!