Cleanroom Engineer

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 Mechanical Engineering, 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!