Founding UX Designer

THE ROLE The problems Neutreeno is trying to solve are genuinely hard. Emissions data is messy, deeply hierarchical, and full of uncertainty. Our users sit inside some of the largest companies in the world and span operations, finance and sustainability, each with different mental models and different definitions of "good". Your job is to make that complexity feel obvious, and to make the resulting insight something a decision-maker acts on. You'll set the design direction and build the system everyone else designs and builds within. Not a Figma library that gathers dust: we expect it structured so prototypes can be spun up in no time and engineers and AI coding agents can build production UI from it directly. You'll also own how we listen to our customers, building the structures that make continuous client engagement part of the fabric of how Neutreeno operates. This is our first full-time UX design hire, and you will be our only and lead designer. This is a hands-on role from day one, with a path to leading an expanded design function as we grow. The product's design is yours to own. This position operates on a hybrid work model with a minimum of 2 days per week in our Cambridge office. Requirements THE WORK YOU’LL DO Product Design Own the end-to-end design of the product, from problem framing and information architecture through to interaction detail and shipped UI. Make complex, uncertain, hierarchical emissions data legible and actionable for operations, finance and sustainability audiences. Set the visual and interaction direction, and raise the bar on craft across everything we ship. Prototype fast and often. Design System, Built AI-First Define, build and maintain the Neutreeno design system: foundations, components, patterns, content and data-visualisation standards. Architect it to be machine-readable and AI-native so AI coding tools and agentic workflows can build against reliably. Make the system the fastest path to both a prototype and production UI. Champion AI-native design and development practices across the team. Cross-Functional Collaboration Work shoulder-to-shoulder with our software engineers, translating design intent into well-scoped work that ships reliably to our customers. Partner with the Head of Product on discovery, roadmap and prioritisation. Work with our climate engineers to understand the methodology behind the numbers, and represent uncertainty, assumptions and data quality honestly in the interface. Customer Engagement and Research Design and run the structures that make client engagement continuous and systematic: design partner programmes, regular usability sessions, feedback channels, and a clear route from what we hear to what we build. Embed those structures across the company so engagement is a shared habit rather than a design activity. Run discovery research on new product capabilities: what to build, for whom, and what "good" looks like. Measure whether shipped work…