marble - Co-Founder, CTO, Construction Operations
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Requirements
• You are a strong fit if you recognise yourself in most of the following: • Software engineering across the stack: You have shipped multi-tenant SaaS and production systems end to end. Solid CS foundations, including data structures, systems design, distributed systems, testing, and architecture that scales. • Python backend: Comfortable building APIs, data pipelines, and service integrations in Python. Familiarity with FastAPI, Django, or Flask is useful but not essential; what matters is that you can design clean, testable services. Familiarity with Supabase, Postgres, and pgvector is useful. • Production AI: You have built agent-first workflows, RAG, structured output parsing, and evaluation harnesses. You know the difference between a demo and a production system. • Cloud infrastructure: You can deploy, monitor, and maintain apps end-to-end on modern cloud platforms (Supabase, Cloudflare, AWS, or similar). You think about latency, cost, and observability from day one. • Technical hiring and team design: You have hired engineers before. You know what a good technical interview looks like, what a bad one looks like, and how to set an early engineering culture that scales without rewrites. • Communication: You can hold both a technical conversation with an investor and a product conversation with a sole trader. • Outcome-driven: You take ownership of outcomes, not tickets. You think in years, not sprints. You see fundraising, hiring, and product as one connected system. • Builder who scales: Ship imperfect on Thursday over perfect next month, track the debt, and know which debt is dangerous. • Product over features: You measure output in customer outcomes and revenue, not story points or lines of code written. • Comfort with ambiguity: You make the call, you write down why, and you move. You revise without ego when reality contradicts the call. • Transparency: Your actions build trust and strong partnerships. • You have been in a founding position before (Co-Founder, Founding Engineer, first hire, etc.). • You have built or contributed to developer platforms, internal tooling, or infrastructure automation that another team relied on. • You have worked with CNN’s and Computer Vision. • You have a strong appreciation for design and UX. • You understand UK construction compliance (MCS, RECC, Part P, Building Regulations) or you can pick it up fast.
Responsibilities
• Technical vision and architecture: Own the end-to-end stack and the multi-year technical strategy, data modelling, and infrastructure. • Shipping software: Write, review, and deploy code. • AI strategy: Own the agentic architecture (RAG, structured output, human-in-the-loop gates). Train, evaluate, and deploy models. • Engineering hiring and team building: Build the engineering function. Define the hiring bar, write the JDs, run technical interviews, and set the engineering culture. • Technical fundraising and storytelling: Own the technical narrative in investor conversations, due diligence calls, and partner meetings. • Defensibility: Identify what is protectable, what stays a trade secret, and what is published. • As CTO and Co-Founder, you will partner directly with the current Founder in Residence, who has been developing this project as CEO over the last 12 months. The founder has 20+ years of product development experience in the construction industry, ML, and Computer Vision. Most recently, he was responsible for an AI-powered quality assurance system used by automotive OEMs, and before that, built and scaled a robotic tool and installer operating system that delivered over 5,000 installs with zero compliance failures.
Benefits
• A €3,000 monthly allowance during your participation in the programme as a Co-Founder in Residence before spinout. • €250,000 inception funding at incorporation, if you are successful. You and your team will own 80% of the company at incorporation. • Full-stack support in our venture creation programme • Mentorship and guidance at every step of the way • Hands-on support across technology and market research, landing interviews with experts and customers, techno-economic modelling, roadmap and scale-up strategy, sourcing your future co-founders and advisors, and more • Access to an unparalleled network across science, industry, talent, investors, mentors, and other climate deeptech founders • Access to our research insights, knowledge base, and curated resources • Weekly check-ins, work sessions in our Paris HQ (or remote) and continuous peer learning with other programme participants • Seed fundraising support after the programme. Introductions to the best seed investors and help with term sheet negotiation. • Founder visa sponsorship if you wish to relocate to France. Remote participation would be a challenge, but we're open to finding different partnership formats. • We believe that a diverse group of minds is key to solving the climate crisis. We encourage women and people of colour to apply. Studies have shown that under-represented candidates are less likely to apply for an opportunity unless they feel they meet every single qualification. We are committed to building a diverse, inclusive and mission-driven cohort. If you’re excited about the programme but your past experience doesn’t align perfectly with what you read on our website, we encourage you to apply anyways! • For a full list of FAQs, please visit our website https://marble.studio/faq.
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