Marble

You'll shape the **technical vision and architecture** for an **AI-native operating system** empowering UK construction micro-businesses. As CTO and technical Co-Founder, you'll **write production code**, lead AI strategy with agentic workflows, and build the engineering team from scratch. This hands-on role offers the chance to tackle a massive climate and efficiency challenge in a fragmented industry.

You'll lead **commercialization and scale-up** of a **novel ironmaking technology** that produces low-emission iron at cost parity. You'll own the commercial roadmap, capital strategy, and partner engagement.

You'll define and lead the subsurface strategy for a next-gen geothermal startup, building reservoir models to guide site selection and well design. Your work will directly enable **2-3× greater well productivity** and a path to **$50/MWh LCOE**. This is a rare opportunity to be a founding engineer at a climate tech venture backed by a top studio.

You'll lead the technical strategy and execution for a **next-generation geothermal company** focused on deploying novel well architectures. Your core impact is driving down costs to achieve **$50/MWh LCOE** while scaling from pilots to a multi-GW global portfolio. This role offers **co-founder equity** and full-stack venture support.

You'll be the **founding CTO** of a **vertically integrated construction robotics platform**. You'll own end-to-end development of purpose-built hardware and an intelligence layer that turns every deployment into training data, addressing a $13 trillion industry's core inefficiencies.

You'll be the primary driver of product delivery and technical architecture for an **AI-native operating system** empowering UK construction micro-businesses. Your core impact is turning installer needs into working software, directly reducing project costs and administrative burden. This role offers the chance to **build from scratch** in a high-impact climate tech venture studio.

You'll partner with a venture studio to build an **AI-driven intelligence platform** for process plants, combining physics models and ML. Your work will **reduce industrial energy spend by 15%** and address a **€300B market**. This is a rare founder opportunity with paid pilots already underway.