Chief of Staff

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. Role Overview We are looking for a Chief of Staff to support the CEO and Head of Operations in driving day-to-day execution across C12. This is a highly operational role focused on bringing structure, rigor, and velocity to the company, while scaling the organization and preserving our mindset. You will act as a force multiplier for the CEO and Head of Ops, ensuring that priorities are clear, key initiatives are delivered on time, and communication flows effectively across the organization.

You will not be expected to define the strategy, but to make sure it is executed.

Key Responsibilities : Execution tracking, Operational rigor, and OKRs follow-up

Anticipate quarterly OKR cycles and maintain the framework in linear

Track company priorities and key transversal projects end-to-end

Maintain clear visibility on progress (Linear updates, critical initiatives)

Ensure consistency and quality of reporting across teams

Right hand of the CEO and Head of Operations

Support the CEO and Head of Ops on ad-hoc topics (incl. fundraising efforts)

Drive cross-functional operational projects

Organize and coordinate leadership sessions (preparation, notes, follow-ups)

Act as a connective layer with teams to reduce friction and increase alignment

Content and Presentations

Support preparation of weekly ExCom (agenda, metrics readiness, action tracking, company communication)

Prepare internal presentations (Monday meetings, quarterly meetings)

Support external materials (board decks, company presentations, talks) with the marketing team

Contribute to thought leadership topics with Marketing

Assist in preparing CEO interventions (calls, presentations, podcasts)

AI Operations Support

Help deploy AI tools, prompts, and workflows across teams

Support identification and rollout of practical AI use cases

Coordinate AI training and change management initiatives

Track ROI / impact of AI initiatives

About You : 2–4 years of experience in consulting, operations, or fast-paced startup environments

Strong execution skills and a reputation for reliability

Highly organized, structured, and detail-oriented

Strong written and verbal communication skills in French and English

Comfortable handling multiple topics in parallel

High level of ownership and follow-through

Interest in AI and operational efficiency tools

Low ego, strong sense of responsibility, and team-oriented mindset

What's in it for You : A hands-on role at the core of company execution

Direct exposure to how a deeptech company operates and scales

Close collaboration with the CEO and Head of Operations

A fast-paced environment with a steep learning curve

What we offer: €55,000 - €62,000 per year

Stock options for every employee (BSPCE/ESOP)

Two incredible office spaces in the heart of Paris

Sponsored trip to conferences around the world

A highly dynamic international team

Swile meal vouchers

Vibrant office culture (team lunches, offsite events, Friday breakfasts..)

Mental health support with moka.care

Training budget/ Annual Learning & Development Allowance

Sabbatical leave (after 2 years in the company)

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.

You should join us if...   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 80-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.   C12 encourages all who feel qualified to apply. Recruitment decisions are based solely on qualifications, skills, knowledge and experience. Applications from women are particularly welcomed.

2–4 years of experience in consulting, operations, or fast-paced startup environments

Strong execution skills and a reputation for reliability

Highly organized, structured, and detail-oriented

Strong written and verbal communication skills in French and English

Comfortable handling multiple topics in parallel

High level of ownership and follow-through

Interest in AI and operational efficiency tools

Low ego, strong sense of responsibility, and team-oriented mindset