About the role
The role
Demi is evolving from a single-channel email product into a proactive AI assistant that operates across a user's full set of tools. This role sits at the centre of that transition. The design engineer will own the end-to-end user experience of how a person works alongside AI agents – how tasks are surfaced, prioritised, delegated, and reviewed.
This is a zero-to-one remit. There is no inherited design system to maintain or existing interface to iterate on. The person in this role will define the interaction patterns, visual language, and information architecture of a product category that does not yet have established conventions.
Day-to-day responsibilities
- Own the full design and front-end build of core product surfaces – from initial concept through to shipped code
- Define interaction models for human–agent collaboration: task handoff, progress visibility, agent output review, and prioritisation
- Produce Figma designs and translate them directly into production React components, working within an Electron-based Mac application
- Work closely with the founding team to shape product direction through the work itself, not through a handoff process
- Establish and maintain a design standard that scales as the team grows
- Move quickly through iteration cycles – prototyping, testing, and shipping in short loops
Scope and ownership
The design engineer will be the sole design function at the company. They will have complete ownership over the product's visual and interaction quality, working directly with the founders rather than within a layered design organisation. This requires both the ability to operate independently and the judgement to know when to push back, when to simplify, and when to move.
The most pressing near-term work is defining how users navigate and act across an agent-driven workspace – a problem that sits at the intersection of task management, ambient intelligence, and workflow design. This is the kind of problem that requires genuine product thinking, not only execution.