c12qe

Cleanroom Engineer

Paris, Île-de-France, France (city only)

On-site · Full-time

First seen by offpeak October 22, 2026

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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:

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!