Come aboard.

At CIRCEO, we build autonomous, wind-powered energy ships to supply clean, land-free compute and e-fuels. As our Office Manager, you are the operational backbone of the company and the anchor of team life. Reporting directly to the CEO, you ensure our day-to-day operations run seamlessly while fostering a close-knit, highly motivated environment. Key ResponsibilitiesFacilities & Office Life: Manage office spaces, suppliers, daily purchasing, and team culture. HR Administration: Handle onboarding, leave tracking, payroll coordination, and recruitment logistics. Events & Communication: Organize board meetings, off-sites, and trade shows; execute external content. Founders Support: Assist leadership with travel, expense reports, and funding file preparation. Profile5+ years in office management or multi-skilled support. Autonomous, highly organized, and fluent in French and English.

We are hiring a Finance Manager to build and run our entire finance function, with one clear priority: maximising and securing non-dilutive funding, which represents close to half of our financing plan through to the first commercial fleet. Equity fundraising is led by our CEO; your battlefield is everything else — public funding (Bpifrance, ADEME, France 2030, EU programmes), financial structuring, accounting and execution. You will be the CEO's right hand and the reference contact for public funders, auditors and advisers. We are looking for someone with proven wins in French and European non-dilutive instruments, solid command of financial modelling for capital-intensive projects, and the rigour to stand in front of auditors with authority. This is a ground-floor, founding-team role: you won't inherit a function, you will build it. If you want to help finance a new class of maritime infrastructure, join us.

Land-based data center expansion is hitting a hard wall: grid connection queues, freshwater scarcity, community opposition. Far offshore, the wind blows stronger and steadier than anywhere on land and the ocean itself becomes the cooling sink. The result: zero grid wait times, zero freshwater consumption, and unmatched carbon intensity for the most power-hungry workloads of the AI decade. Your mission: turn this physical advantage into a commercial category. You will define the go-to-market for offshore compute capacity, structure innovative offers tailored to variable, wind-backed power profiles — fault-tolerant training batches, asynchronous inference, dynamic pricing, zero-carbon AI clouds and close strategic off-take agreements with Neocloud providers, AI labs, CSPs and Tier-1 HPC operators. You will be the authoritative interface between client C-levels and marine engineering, translating workload requirements into onboard architecture. You know the decision-makers across the Neocloud ecosystem, and the deal is your natural habitat. Sound like you? Let's talk.

At CIRCEO, we harvest the wind with energy ships to deliver low-carbon electricity. As our Marine Mechanical Technician, your mission is to assemble our demonstrator’s machinery and keep it turning. You will start ashore in our pre-integration hall, building test benches and running the first checks on our systems. Once validated, you will transfer, install, and commission this equipment on board our 16-metre trimaran. You own what you install: when the vessel sails, you sail with it to troubleshoot and maintain the hardware in real marine conditions. You will not tackle this alone: you will work shoulder-to-shoulder with our engineers, who share your hands-on drive and will be right there in the grease with you, diagnosing faults and tuning the systems as a united, tight-knit crew. Ready to cast off and build an audacious vessel? Welcome aboard!

At CIRCEO, we harvest the wind with energy ships to deliver low-carbon electricity. As our Marine Electrical Technician, your mission is to assemble our demonstrator’s machinery and keep it turning. You will start ashore in our pre-integration hall, building test benches and running the first checks on our systems. Once validated, you will transfer, install, and commission this equipment on board our 16-metre trimaran. You own what you install: when the vessel sails, you sail with it to troubleshoot and maintain the hardware in real marine conditions. You will not tackle this alone: you will work shoulder-to-shoulder with our engineers, who share your hands-on drive and will be right there in the grease with you, diagnosing faults and tuning the systems as a united, tight-knit crew. Ready to cast off and build an audacious vessel? Welcome aboard!

At CIRCEO, we harvest the wind with energy ships to deliver low-carbon electricity. For the Test & Marine Operations Engineer role, we are looking for a mariner first and foremost: you will take our demonstrator to sea and bring back irrefutable results. Your challenge begins ashore, orchestrating the validation of our systems in our pre-integration hall. Once afloat, you take the helm to pilot the sea trials campaign and the operational life of the vessel. As a true mariner who knows how to read the weather, the sea, and crew fatigue, you make the critical "go/no-go" calls, owning this choice with calm authority in the face of engineering impatience. As the absolute guarantor of every test's traceability and our regulatory framework, you will steer this mission alongside a tight-knit crew. Are you a former professional mariner eager to embark on an industrial adventure? Welcome aboard!

Firm power is the rarest resource of the AI decade. At CIRCEO, we build autonomous, wind-powered energy ships that harvest clean power on the open ocean and turn it directly into sovereign compute. Reporting to the CTO, you will own the end-to-end IT architecture on board. You will engineer how high-density, liquid-cooled compute hardware is powered, cooled, enclosed, connected, and maintained on a moving, salt-laden vessel whose available energy follows the wind. Key Responsibilities: Architect DC power distribution, direct-to-chip seawater cooling, and marinised rack enclosures. Own the design, integration, and measurement campaign for our floating laboratory and demonstrator. Build the maintenance and repair model for rapid hardware servicing and re-racking. Define the IT and industrial control domain boundaries and interface with compute partners.

At CIRCEO, we hunt ocean winds with autonomous energy ships to deliver low-carbon electricity. As our Wind Turbine Engineer in Nantes, your immediate mission is to own the turbine for our first demonstrator vessel. Your technical challenge is to retrofit an 80 kW onshore machine so it withstands the harsh dynamic and gyroscopic loads of a sailing trimaran. Leaving nothing to chance, you will tackle reverse engineering, rigorous bench validation, and hands-on sea commissioning. You will steer this project end-to-end alongside a tight-knit crew, delivering robust solutions that bridge audacious innovation with highly practical, grounded engineering. Next, you will push the boundaries even further by leading the ground-up design of a 3 MW turbine for our full-scale energy ship. Ready to leave the shore behind and pioneer a bold new frontier in wind energy? Step aboard and join the crew!

At CIRCEO, we harvest the wind with energy ships to deliver low-carbon electricity. As a Naval Engineer, your mission is to bring our demonstrator to life: a 16-metre trimaran. Your challenge is to coordinate the design office, the suppliers, and the shipyard, from the drawing board to the water. With a sharp marine sense, you will manage construction contingencies and marinize our specific systems, notably the cooling circuit of our onboard IT servers. You will steer this project end-to-end alongside a tight-knit crew, owning your choices with boldness and pragmatism. Next, you will be at the heart of the naval architecture studies for our full-scale energy ship. Ready to cast off and build an audacious vessel? Step aboard and join the crew!

Your responsibilities: You own the algorithms for routing and mission optimization. You arbitrate heading, speed, and power production against uncertain meteorological forecasts. Additionally, you own the state observers and ensure the coherence of our mathematical models. Your profile: Bringing 5 to 10 years of experience in scientific computing, you possess a strong pragmatic and maritime sense. You know the ocean is a harsh environment that ruthlessly exposes the gap between theory and practice. We need a grounded engineer, not an ivory-tower theoretician: someone who builds resilient routing policies rather than fixed routes, and who manages raw uncertainty rather than simple expected values. Your mathematics must survive contact with the real world, and you will measure their performance at sea, not on slides

Your responsibilities: You own the complete electrical architecture of our ships, from the wind turbine generator to the high-voltage DC distribution, battery storage, and controllable computing load. You own protection coordination, the neutral regime, and the test benches required to physically validate the entire chain. Your profile: With 5 to 10 years in electrical engineering or power electronics, you have hands-on experience energizing something you designed and dealing with what happens next. We are looking for a highly pragmatic engineer: you will design the cabinet, commission it, provoke a fault in it on purpose, and measure which protection opened first. Whether your background is in marine, wind, EVs, or general industry, what matters is that you instrument, measure, and conclude from real hardware rather than just normative knowledge.

Your responsibilities: You own the strict coherence between what the model says, what the code does, and what the measurement shows. You handle the decomposition into time-scaled loops—from fast electrical cycles to multi-day mission layers—alongside state observation and energy management. Your profile: Bringing over 10 years of experience on real physical systems, you master production code generation (such as Embedded Coder). You have definitively tuned control loops on actual hardware, as simulation alone is not enough here. If you are drawn to coupled variables and negatively damped modes, and want your code to actually fly a physical ship at sea, this role is for you.

At CIRCEO, we harvest the wind with energy ships to deliver low-carbon electricity. As our Industrialization Engineer, your mission is to turn a technical challenge into a mass-produced product: transitioning from a demonstrator to the large-scale production of our autonomous fleet. Your challenge is to embed manufacturing and maintainability constraints right from the design phase of our full-scale ship. From standardization to cost ownership, you will define our industrial strategy: shipyards selection, supply chain management, all the way to sizing our future dedicated production facility. Starting from a blank page, you will invent the maintenance infrastructure for these unmanned vessels from scratch. Writing the rules as you go, you will enforce your industrial convictions with pragmatism, working shoulder-to-shoulder with a tight-knit crew. Have you mastered the realities of the marine industry and serial production? Welcome aboard!