Quantum RF Engineer

France·ParisFull - timemid

OtherRf Engineer

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Quick Summary

Key Responsibilities

Design and simulation of DC,

Technical Tools

OtherRf 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 90 people, including over 20 PhDs, has over 20 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.

As Quantum RF Engineer your main responsibility will be contributing to the design & optimization of passive and active on-chip microwave components for qubit control, qubit-qubit interfacing and qubit readout.

You would be performing EM and circuit simulations for individual components and integrated systems along with contributions to cryogenic measurements for component and system performance verification.

Key responsibilities:

Design and simulation of DC, RF and microwave on-chip components

Contributing to the cryogenic measurement

Contributing to the continuous improvement of our python based design repository and integration with simulation workflow

Occasional involvement in design of mechanical parts (Fusion 360, SolidWorks…) and PCBs.

At least Master's degree in Quantum Physics (preferred), Applied Physics, Electrical engineering, Nanotechnology or Nanoscience or other related disciplines

Previous experience designing and integrating RF & microwave components and subsystems:

Previous electromagnetic simulations using industry standard tools such as HFSS, SONNET, ADS, Comsol

High-frequency (RF, microwave or mm-wave), IC or PCB design

Previous experience with chip design layout tools like Klayout, L-Edit

Design/development in Python

Great communication in English (verbal and written)

Really nice to have:

Previous experience with cryogenic RF and DC measurement

Knowledge of semiconductor device physics and microfabrication processes

Knowledge of fabrication principles and the constraints they impose on physical device parameters

What we offer:

55,000 euros - 62,000 euros yearly base salary

Stock options for every employee (BSPCE/ESOP)

Sponsored trip to conferences around the world

A highly dynamic international team

Swile meal vouchers

Mental health support with moka.care

Training budget/ 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 want to have a key role in a growing startup with challenges at the frontier of the 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 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 compensations based on skills and experiences. Applications from women are especially welcomed!