Cleanroom Engineer
Paris, France
Posted on Feb 13, 2026
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:
- 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
Regular performance checks, calibration, and preventive maintenance
Troubleshooting and first-line repairs
Required Qualifications:
- 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:
- 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)
Lithography
Thin-film deposition (PVD, CVD, ALD)
Dry etching (RIE, ICP) and/or wet processing
What We Offer:
- €53,000 - €70,000 per year
- 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
- 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.
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 welcome.