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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 20 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:

As a Cleanroom Engineer at C12, you will be responsible for the operation, maintenance, and continuous improvement of cleanroom equipment. You will work hands-on with several process systems, ensuring reliable wafer production while maintaining the highest standards of safety, quality, and uptime in a startup environment.

This role is ideal for someone who enjoys technical ownership, problem-solving, and close collaboration with researchers, facilities, and external vendors.

Key responsibilities:

• Take technical ownership of several cleanroom tools, including:
  • Regular performance checks, calibration, and preventive maintenance
  • Troubleshooting and first-line repairs

• Operate process tools to support wafer fabrication for R&D and early production
• Anticipate technical and operational risks; propose and implement mitigation actions
• Coordinate with equipment manufacturers, service engineers, and vendors for installations, upgrades, and major repairs
• Anticipate facility-related bottlenecks (utilities, gases, vacuum, HVAC, etc.) and support continuous improvement initiatives
• Develop, implement, and maintain safety standards, SOPs, and best operational practices
• Interface efficiently with subcontractors and suppliers to sustain an uninterrupted fabrication process
• Contribute to cleanroom documentation, tool logs, spare parts management, and maintenance planning

About you:

• Bachelor's or master's degree in Engineering, Physics, Materials Science, Micro/Nano-fabrication, or a related field
• Hands-on experience in a cleanroom environment (academic or industrial)
• Practical knowledge of some of the following processes or tools:
  • Lithography
  • Thin-film deposition (PVD, CVD, ALD)
  • Dry etching (RIE, ICP) and/or wet processing

• Experience with tool maintenance, troubleshooting, and vendor coordination
• Strong awareness of cleanroom safety and chemical handling
• Ability to work autonomously, prioritize tasks, and thrive in a startup environment
• Fluency in English (working proficiency required)

What we offer:

• €53,000 - €70,000 per year
• Stock options for every employee (BSPCE/ESOP)
• Sponsored trip to conferences around the world
• Swile meal vouchers
• Mental health support with moka.care
• Training budgets/ 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 85-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.

We still encourage you to apply, 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 compensation based on skills and experience.

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.