
C12 · Paris
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 chang...
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 25 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.
SENIOR DESIGN ENGINEER (ADVANCED ENERGY HARDWARE) Freeform builds AI-native manufacturing systems that unify software, hardware, and physics to produce industrial-scale parts at the speed of human ideation. By treating manufacturing as a single integrated system, we unlock a new era of innovation where complex hardware is designed, built, and scaled without limits. Freeform is hiring a Senior Design Engineer focused on advanced energy hardware to sit at the intersection of advanced part design and additive manufacturing. This is a deeply technical senior engineering role responsible for rethinking how energy hardware is conceived, designed, and produced. Not just adapting existing parts for a new process but fundamentally reimagining what's possible when legacy design constraints no longer apply. You will own complex design challenges end-to-end, working hands-on with some of the most complex hardware in the industry, and serve as a technical authority on where Freeform's platform unlocks performance regimes, architectures, and geometries that were previously impractical or impossible. The ideal candidate is a highly experienced mechanical or energy systems engineer with deep intuition for part design, a genuine passion for pushing the boundaries of what hardware can do, and a track record of leading technical work on complex hardware programs. They understand various advanced energy systems at a component and systems level, can independently drive and mentor others on manufacturability, materials, and performance tradeoffs, and are excited by the creative challenge of designing parts from first principles. The core draw of this role is the engineering itself - though this person will also engage directly with some of the most sophisticated frontier companies in the energy industry. Responsibilities: * Drive part design and redesign across a broad range of energy hardware, including: * Turbines and rotating machinery for power generation * Heat exchangers and thermal management hardware * Valves, manifolds, and fluid handling systems * Pressure vessels and high-integrity structural components * Burners, combustors, and fuel delivery systems * Balance-of-plant components for nuclear, hydrogen, and conventional power systems * Develop and own deep component-level understanding of requirements, performance drivers, and system constraints within energy generation, transmission, and storage programs * Lead first-principles part redesigns, identifying where additive manufacturing enables new geometries, consolidated assemblies, improved performance, or reduced cost and lead time * Define and evaluate design concepts with expert command of materials, tolerances, thermal and structural behavior, and production considerations * Serve as a senior technical resource, independently resolving advanced questions related to design tradeoffs, process capabilities, qualification pathways, and production scalability, and helping guide less experienced engineers * Partner closely with internal engineering and operations teams to drive feasibility, refine concepts, and own execution outcomes * Lead technical engagements with customer engineering teams to understand application requirements, present design solutions, and establish deep technical credibility at a senior level * Identify, scope, and champion new application spaces where Freeform's technology can deliver step-change improvements over conventional manufacturing * Shape Freeform's product, process, and technology roadmap through field-informed technical leadership and strategic input Basic Qualifications: * Bachelor's degree in mechanical engineering or closely related technical discipline * 5+ years of experience in a hands-on engineering role within power generation, oil & gas, nuclear, renewable energy, or a closely related advanced energy industry * Demonstrated ability to lead complex hardware programs from concept through qualification and production * Experience designing or analyzing turbomachinery, thermal systems, fluid systems, pressure-bearing hardware, or high-performance structural components * Deep systems-level understanding of complex mechanical hardware and how components function within larger assemblies Nice to Have: * 10+ years of experience in a hands-on engineering role within power generation, oil & gas, nuclear, renewable energy, or a closely related advanced energy industry * Familiarity with metal 3D printing or design for additive manufacturing (DFAM) concepts * Strong intuition for part design, design-for-manufacturing, and how component geometry relates to performance and producibility * Experience mentoring engineers and providing technical direction on hardware development programs * Experience carrying hardware through development, qualification, and production ramp * Ability to clearly communicate complex technical concepts to both engineering and non-engineering stakeholders * Strong first-principles reasoning and comfort operating in ambiguous, fast-moving problem spaces * Strategic thinker with an instinct for where technology can unlock the most value * Team player, positive attitude, growth mindset, integrity, accountability, adaptability, entrepreneurial, driven, results-oriented and ethical Location: * Based in Hawthorne, our vertically integrated facility brings technology development, R&D, and production together under one roof. We operate at the center of LA’s deep tech ecosystem, surrounded by some of the most ambitious hardware innovation happening anywhere in the country. * Our fast-paced, cross-functional environment is built on close collaboration, and as such, this role requires full-time onsite presence (five days a week), with very limited exceptions. What We Offer: * We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions. * We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling a world-changing technology. * Benefits * Significant stock option packages * 100% employer-paid Medical, Dental, and Vision insurance (premium PPO and HMO options) * Life insurance * Traditional and Roth 401(k) * Relocation assistance provided * Paid vacation, sick leave, and company holidays * Generous Paid Parental Leave and extended transition back to work for the birthing parent * Free daily catered lunch and dinner, and fully stocked kitchenette * Casual dress, flexible work hours, and regular catered team building events * Compensation * As a growing company, the salary range is intentionally wide as we determine the most appropriate package for each individual taking into consideration years of experience, educational background, and unique skills and abilities as demonstrated throughout the interview process. Our intent is to offer a salary that is commensurate for the company’s current stage of development and allows the employee to grow and develop within a role. * In addition to the significant stock option package, the estimated salary range for this role is $150,000-$200,000. The upper end of the range is reserved for individuals who demonstrate exceptional experience, deep domain mastery, and a proven history of high performance and impact. * Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.
DESIGN ENGINEER (ADVANCED ENERGY HARDWARE) Freeform builds AI-native manufacturing systems that unify software, hardware, and physics to produce industrial-scale parts at the speed of human ideation. By treating manufacturing as a single integrated system, we unlock a new era of innovation where complex hardware is designed, built, and scaled without limits. Freeform is hiring a Design Engineer focused on advanced energy hardware to sit at the intersection of advanced part design and additive manufacturing. This is a deeply technical engineering role responsible for rethinking how energy hardware is conceived, designed, and produced. Not just adapting existing parts for a new process but fundamentally reimagining what's possible when legacy design constraints no longer apply. You will work hands-on with some of the most complex hardware in the industry, identifying where Freeform's platform unlocks performance regimes, architectures, and geometries that were previously impractical or impossible. The ideal candidate is a strong mechanical or energy systems engineer with a deep intuition for part design and a genuine passion for pushing the boundaries of what hardware can do. They understand various advanced energy systems at a component and systems level, can independently reason about manufacturability, materials, and performance tradeoffs, and are excited by the creative challenge of designing parts from first principles. The core draw of this role is the engineering itself - though this person will also engage directly with some of the most sophisticated frontier companies in the energy industry. Responsibilities: * Drive part design and redesign across a broad range of energy applications, including: * Turbines and rotating machinery for power generation * Heat exchangers and thermal management hardware * Valves, manifolds, and fluid handling systems * Pressure vessels and high-integrity structural components * Burners, combustors, and fuel delivery systems * Balance-of-plant components for nuclear, hydrogen, and conventional power systems * Develop a deep understanding of component-level requirements, performance drivers, and system constraints within energy generation, transmission, and storage programs * Rethink part design from first principles - identifying where additive manufacturing enables new geometries, consolidated assemblies, improved performance, or reduced cost and lead time * Develop and evaluate design concepts with a strong command of materials, tolerances, thermal and structural behavior, and production considerations * Independently answer advanced technical questions related to design tradeoffs, process capabilities, qualification pathways, and production scalability * Work closely with internal engineering and operations teams to drive feasibility, refine concepts, and align on execution * Engage directly with customer engineering teams to understand application requirements, present design solutions, and build technical credibility * Identify and pursue new application spaces where Freeform's technology can deliver step-change improvements over conventional manufacturing * Provide field-informed feedback to shape Freeform's product, process, and technology roadmap Basic Qualifications: * Bachelor's degree in mechanical engineering or closely related technical discipline * 5+ years of experience in a hands-on engineering role within power generation, oil & gas, nuclear, renewable energy, or a closely related advanced energy industry * Experience designing or analyzing turbomachinery, thermal systems, fluid systems, pressure-bearing hardware, or high-performance structural components * Systems-level understanding of complex mechanical hardware and how components function within larger assemblies Nice to Have: * Familiarity with metal 3D printing or design for additive manufacturing (DFAM) concepts * Strong intuition for part design, design-for-manufacturing, and how component geometry relates to performance and producibility * Experience carrying hardware through development, qualification, and production ramp * Ability to clearly communicate complex technical concepts to both engineering and non-engineering stakeholders * Strong first-principles reasoning and comfort operating in ambiguous, fast-moving problem spaces * Strategic thinker with an instinct for where technology can unlock the most value * Team player, positive attitude, growth mindset, integrity, accountability, adaptability, entrepreneurial, driven, results-oriented and ethical Location: * Based in Hawthorne, our vertically integrated facility brings technology development, R&D, and production together under one roof. We operate at the center of LA’s deep tech ecosystem, surrounded by some of the most ambitious hardware innovation happening anywhere in the country. * Our fast-paced, cross-functional environment is built on close collaboration, and as such, this role requires full-time onsite presence (five days a week), with very limited exceptions. What We Offer: * We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions. * We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling a world-changing technology. * Benefits * Significant stock option packages * 100% employer-paid Medical, Dental, and Vision insurance (premium PPO and HMO options) * Life insurance * Traditional and Roth 401(k) * Relocation assistance provided * Paid vacation, sick leave, and company holidays * Generous Paid Parental Leave and extended transition back to work for the birthing parent * Free daily catered lunch and dinner, and fully stocked kitchenette * Casual dress, flexible work hours, and regular catered team building events * Compensation * As a growing company, the salary range is intentionally wide as we determine the most appropriate package for each individual taking into consideration years of experience, educational background, and unique skills and abilities as demonstrated throughout the interview process. Our intent is to offer a salary that is commensurate for the company’s current stage of development and allows the employee to grow and develop within a role. * In addition to the significant stock option package, the estimated salary range for this role is $120,000-$150,000. The upper end of the range is reserved for individuals who demonstrate exceptional experience, deep domain mastery, and a proven history of high performance and impact. * Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.
Please note: Due to the summer holiday period, we will begin reviewing applications in early September. We look forward to receiving your application! As an Mechanical, Thermal & Propulsion (MTP) Systems Engineer, you will play a key role in shaping the next generation of spacecraft propulsion systems at OHB Sweden. Our customers include major space companies, agencies, and commercial operators across Europe and worldwide. OHB Sweden develops propulsion systems for a wide range of scientific, commercial, and Earth-observation missions. Our propulsion solutions enable orbit raising, station keeping, attitude control, collision avoidance, and end-of-life disposal for spacecraft operating in increasingly demanding mission environments. The Propulsion Department is responsible for the complete lifecycle of OHB Sweden's propulsion products, including system design, analysis, testing, qualification, production support, and future technology development. The department plays a central role in enabling mission success and is a key contributor to OHB Sweden's long-term competitiveness in the rapidly evolving space industry. As our propulsion business continues to grow, we are strengthening our engineering organization with a new multidisciplinary technical leadership role. About the Role As an MTP Systems Engineer, you will be the technical owner of complete propulsion subsystems from concept through qualification and production. The role combines systems engineering with deep technical understanding of spacecraft propulsion, thermal control, and mechanical engineering. You will coordinate multidisciplinary development activities and ensure that all engineering disciplines work together to deliver an optimized subsystem. You will lead the technical development of propulsion subsystems while coordinating a team of specialists within propulsion, thermal engineering, mechanical design, and structural analysis. Although these specialists provide the detailed engineering within their respective disciplines, you will be responsible for the overall technical solution and ensuring that all subsystem requirements are met. You will work closely with customers, suppliers, project managers, and internal engineering teams throughout the complete product lifecycle. As an MTP Engineer, you will be responsible for: Technical ownership of spacecraft propulsion subsystems throughout the full development lifecycle. Defining technical solutions together with multidisciplinary engineering teams. Coordinating activities across propulsion, mechanical, thermal, and structural engineering disciplines. Leading technical trade studies and engineering decisions. Ensuring subsystem performance, interfaces, requirements compliance, and technical consistency. Driving system budgets including mass, pressure, thermal, structural, and performance. Coordinating subsystem verification, qualification, and acceptance activities. Supporting customer meetings, technical reviews, and proposal activities. Working closely with project managers to balance technical performance, schedule, cost, and risk. Mentoring engineers and providing technical guidance within the multidisciplinary team. What We're Looking For Master's degree in Aerospace Engineering, Mechanical Engineering, Physics, or a related engineering discipline. At least 7 years of experience developing spacecraft or in-orbit propulsion systems. Solid understanding of spacecraft mechanical design principles. Strong understanding of spacecraft thermal control systems and thermal engineering. Good understanding of spacecraft propulsion systems, including monopropellant hydrazine and bipropellant propulsion. Experience working in multidisciplinary engineering teams. Experience coordinating complex technical developments across several engineering disciplines. Strong systems thinking and excellent problem-solving skills. Excellent communication and stakeholder management skills. Fluency in English. It is considered an advantage if you also have Experience with electric propulsion systems. Experience with propulsion system integration and verification. Experience working with ESA or other institutional space programs. Experience with spacecraft system engineering. Experience supporting customer technical reviews and proposal work. What We Offer A unique opportunity to shape the future of OHB Sweden's propulsion systems. A technically challenging role with significant influence on subsystem architecture and engineering decisions. Involvement across the complete lifecycle of spacecraft propulsion systems. Collaboration with highly skilled specialists across multiple engineering disciplines. A supportive and innovative engineering environment with excellent opportunities for professional development. The MTP Engineer reports to the Head of Propulsion and will work as the technical lead for multidisciplinary propulsion subsystem development. Some travel may be required (typically 2–4 trips annually, primarily within Europe). Join us and help develop the next generation of spacecraft propulsion systems.