C12 Jobs

Marketing & Communications Assistant

C12

Marketing & Communications Assistant

Posted 2 Days Ago

Be an Early Applicant

Paris, Île-de-France, FRA

Hybrid

45K-50K Annually

Junior

Quantum Computing

The Role

Support day-to-day marketing and communications: manage LinkedIn and X content calendar, create on-brand text and visuals, handle event logistics and media/lab visits, produce blog and website content, design marketing materials, and track performance metrics to inform improvements.

Summary Generated by Built In

C12 develops reliable & application-specific quantum computers, to solve complex computing tasks, currently out of reach of even the most powerful supercomputers. Building a quantum computer still needs innovators who are ready to tackle exciting challenges. At C12, we are convinced that a new material for the qubit will bring a technological breakthrough. At C12, the fundamental building block of the quantum processor—a qubit—is constructed using ultra-pure carbon nanotubes suspended above a silicon chip with control electrodes and superconducting resonators. This high-purity material minimises errors, enhances performance, and reduces hardware overhead for fault-tolerant computing. Spin qubits coupled to a microwave resonator offer exciting possibilities for control, manipulation, and circuit architecture. The suspended isotopically pure 12C nanotube significantly improves stability by reducing sources of decoherence, such as charge noise, nuclear spin noise, and phonon relaxation. Leveraging well-established semiconductor techniques, carbon nanotubes hold great promise for scaling quantum computing, much like silicon in classical computing.

Founded in 2020, C12 is a fast-growing start-up, who recently raised EUR 18 million in 2024 to further its research in its own lab in the heart of Paris (Panthéon).

Your role at C12 Quantum Electronics

At C12, Marketing & Communications spans science, business, and storytelling. We manage everything from press and social media to events, partnerships, and institutional visits, working closely with our co-founders, scientific team, and external partners to build C12's visibility in the quantum ecosystem and beyond. We are looking for a Marketing & Communications Associate to join as the second person on the team. You will work directly with our Marketing & Communications Manager and be the driving force behind C12's day-to-day communications.

Your main responsibilities include:

Owning LinkedIn & X end -to end: content calendar, drafting, scheduling, and performance tracking
Creating on-brand content autonomously across text, visuals, and other formats, writing and publishing blog articles for SEO and repurposing across channel
Owning event logistics including: tracking, materials, suppliers, booth, merch, and follow-ups
Attending and representing C12 at events, as well as organising and supporting lab visits for press, journalists and PR partners
Creating branded decks, flyers, social posts, infographics and website visuals
Supporting announcements around product milestones, new hires, lab updates, and key company moments
Tracking and analysing marketing performance metrics and provide insights for improvement

About you:

You hold a bachelor's or master's degree in Marketing, Communications or a related field. A scientific background or genuine curiosity for tech is a bonus.
You are fluent in French and English, written and spoken
You have a first experience in marketing and communications. Experience in a start-up or fast-moving environment is a bonus
You have a track record of creating and managing social content, particularly on LinkedIn and with design tools like Canva, Figma or Adobe
You have strong organisational skills and attention to detail
You are proactive, creative, curious and enjoy introducing fresh ideas.

What we offer:

€45,000 - €50,000 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.

Skills Required

Bachelor's or Master's degree in Marketing, Communications or related field
Fluency in French and English, written and spoken
First experience in marketing and communications
Track record creating and managing social content, particularly on LinkedIn and X
Experience with design tools (Canva, Figma, or Adobe)
Strong organisational skills and attention to detail
Proactive, creative, curious mindset and ability to introduce fresh ideas
Experience in a start-up or fast-moving environment
Scientific background or genuine curiosity for tech

View all jobs at C12

View C12 Profile

Report Job

Am I A Good Fit?

beta

Get Personalized Job Insights.

Our AI-powered fit analysis compares your resume with a job listing so you know if your skills & experience align.

The Company

HQ: San Antonio, TX

54 Employees

Year Founded: 2020

What We Do

C12 is building reliable quantum computers. The company is a spin-off from ENS launched in January 2020 by twin brothers Matthieu and Pierre Desjardins to supercharge the development of the lab’s promising new quantum technology. Quantum computing has the potential to change our lives. But frequent errors limit the technology’s viability. We are tackling the fundamental issue: the nature of the hardware itself. We are tapping into the simplest material–carbon–to drive a technological breakthrough in the field. Unlike other quantum computers, we use carbon nanotubes as the fundamental building block of our processor. By combining the power of an ultra-pure material with an easy-to-manufacture semiconductor device, we are building a scalable platform for quantum computing. Our executive co-founders bring a unique combination of scientific excellence and business skills to the company. Our team is made up of the world’s most accomplished experts in quantum electronics and carbon nanotube science. Our scientific advisors are renowned scientists and pioneers in spin qubits: Dr. Takis Kontos, Dr. Matthieu Delbecq and Dr. Jérémie Viennot. In June 2021, C12 secured a $10 million seed round with funding from 360 Capital, Bpifrance (Digital Venture Fund), Airbus Ventures, BNP Paribas Développement, and Octave Klaba (OVHcloud), and additional grants from Bpifrance and the Ile-de-France Region. We are leading quantum’s next material breakthrough, and we are just getting started. Silicon enabled the emergence of classical computing – it’s time for carbon to do the same for quantum !