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 60, including 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.
Your role at C12 Quantum Electronics :
Our core software team is looking for an additional senior software developer.
The software team is here to assist and facilitate the work of the research teams towards building a quantum computer.
In close contact with the scientific teams, you will help build tools that help the scientific teams automate and improve their processes.
Alongside supporting the R&D teams, this role involves developing and maintaining the C12's emulator Callisto and its infrastructure, contributing to a range of projects with industrial collaborators while in close cooperation with our theory and quantum algorithm teams.
You are expected to be curious, adaptable and ready to discover new languages/frameworks/apis.
We want a problem solver that tries to use the best tool for the job.
About You:
- You have 5+ years of experience in software development
- Having experience with python is a plus, though not mandatory if you have experience in several other languages
- Experience with REST API is a plus
- Experience with Cloud based technologies (AWS) is a plus
- A background in physics (through studies or work) is a plus
- You have an interest in new technologies like quantum computing
- Good communication in English (verbal and written)
What we offer:
- Stock options for every employee (BSPCE/ESOP)
- Two incredible office spaces in the heart of Paris (both next to the famous Panthéon!)
- 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 budgets/ Annual Learning & Development Allowance
- Sabbatical leave (after 2 years in the company)
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 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.
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.
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
TECHNICAL & MARKET ANALYSIS | Appended by Quantum.Jobs
Software engineering in the quantum domain is structurally necessary to translate low-level physical control and raw hardware output into programmable, accessible systems. This role type serves as the critical interface between experimental quantum hardware—like the carbon nanotube processors used by C12 Quantum Electronics—and the algorithm or end-user application layer. The primary value-chain impact is the creation of reproducible, scalable, and automated control and simulation environments, mitigating technical readiness level (TRL) gaps inherent in new quantum processor architectures. Demand for this specialized talent reflects a sector-wide prioritization of software tooling maturity over pure hardware metrics, essential for driving early commercial adoption and research throughput.
The quantum ecosystem faces a persistent challenge in vendor fragmentation and the immature state of full-stack integration, positioning software engineers as key coordinators in the middle layer. This role occupies a vital segment of the software value chain, specifically focused on systems-level enablement and hardware abstraction, distinct from pure quantum algorithm development. Macro constraints include the limited availability of high-fidelity quantum processors and the subsequent reliance on robust emulation and simulation environments for development and testing. As public and private funding cycles accelerate the transition from NISQ to fault-tolerant architectures, the emphasis shifts toward building resilient, scalable control plane infrastructure capable of managing increasing qubit counts and mitigating complex noise models. Current industry focus lies on bridging classical and quantum capabilities at scale, ensuring seamless operation between traditional cloud environments and specialized quantum computing resources, which often necessitates expertise in both domains. This hybrid dependency requires rigorous software engineering practices to ensure data integrity and real-time system health monitoring, a critical area where workforce gaps are pronounced.
The technical skill architecture underpinning this function centers on three core capability domains: control plane programming, emulation infrastructure development, and cross-platform API creation. Proficiency in modern software development paradigms is essential for creating automated tools that streamline data acquisition from quantum hardware and prepare it for analysis by scientific teams. Tooling layers include classical computation resources (e.g., cloud platforms like AWS) and low-latency programming environments necessary for pulse-level control or rapid measurement feedback. Interoperability relies on REST APIs and standardized communication protocols that abstract hardware complexity, enabling researchers to focus on quantum algorithms rather than device physics. These capabilities are crucial for achieving operational stability, accelerating the research-to-deployment cycle, and ensuring that quantum processors, whether physical or emulated, are stable, reproducible, and accessible for broader industrial and academic use. * Establishes standardized testing and validation procedures for novel quantum hardware architectures.
* Accelerates the iteration cycle between quantum hardware discovery and software enablement tooling.
* Develops robust simulation environments essential for pre-commercial application benchmarking.
* Enables systematic integration of specialized quantum processors into external classical computing workflows.
* Reduces technical debt associated with managing rapidly evolving, experimental control systems.
* Facilitates intellectual property translation from core research into scalable, managed software products.
* Optimizes data pipeline latency between quantum measurement systems and post-processing analysis.
* Maintains platform stability critical for sustaining continuous, high-volume research throughput.
* Drives tooling maturity necessary for transitioning quantum computing from lab demonstration to operational readiness.
* Secures core quantum computing IP through systematic infrastructure hardening and access control.
* Refines hardware-specific calibration and diagnostic automation across evolving processor generations.
* Maximizes system accessibility for theory and algorithm teams engaged in collaborative development.Industry Tags: Quantum Software Engineering, Carbon Nanotube Qubit, Quantum Control Systems, Hardware Abstraction Layer, Quantum Emulation, Fault-Tolerant Computing, Full-Stack Quantum, Quantum Systems Integration, Cloud Quantum Services, Quantum R&D Automation
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