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About the Role
We are hiring a Design Engineer to design and build interfaces for understanding and acting on complex systems. This hybrid role involves taking problems from ambiguity to shipped software, exploring interaction models, prototyping, testing, and implementing experiences in React and TypeScript. The work requires making dense, changing information understandable, including knowledge graphs, process models, timelines, simulations, and collaborative edits. You will also contribute to HASH's digital brand expression, potentially building product launch pages, interactive explanations, or reusable visual components. The role typically involves two-thirds product work and one-third brand/web, with close collaboration with product designers, engineers, researchers, customer-facing colleagues, and HASH's founder. You will help define systems and standards for growing design and marketing teams. This is not a role where finished designs are handed off; you will own the implementation and your design judgment is key.
Responsibilities
- Design and implement solutions end-to-end, from UX wires and experimentation to in-app delivery and interaction design polish.
- Work with users, customer-facing colleagues, and product teams to understand workflows, failure modes, and real constraints.
- Design and build interfaces for knowledge graphs, process models, simulations, AI-assisted workflows, and complex operational data.
- Develop clear ways to navigate entities, relationships, state changes, provenance, uncertainty, and history.
- Prototype alternative interaction paradigms and test them before the team commits to an approach.
- Ship polished production interfaces in React and TypeScript, including final details.
- Build and maintain accessible, responsive components and patterns that work coherently across HASH.
- Improve our design system, design tokens, component APIs, and the collaboration model between design and engineering.
- Create coded brand and marketing experiences, including landing pages, interactive explainers, product announcements, and demonstrations.
- Translate HASH's visual identity into motion, interaction, and reusable web components.
- Work with brand and marketing colleagues on assets that become more compelling because they are interactive rather than static.
- Use AI-assisted design and coding tools thoughtfully to explore more possibilities and ship faster, while retaining responsibility for every decision and line of production code.
- Review the product regularly, identify quality gaps, and fix them without waiting for a perfectly formed brief.
- Contribute reusable work to HASH's open-source codebases.
Requirements
- A visual portfolio showing exceptional product and interaction design, including substantial work that you personally implemented.
- Strong visual craft across typography, layout, spacing, hierarchy, color, states, and motion.
- Production-level ability with React, TypeScript, HTML, and modern CSS.
- Experience designing and building responsive, accessible interfaces from rough requirements rather than detailed specifications.
- The ability to reduce a complicated domain or workflow to a clear interaction model without hiding important truth.
- Strong prototyping instincts: you know when to sketch, use Figma, build a throwaway coded prototype, or work directly in the production codebase.
- Experience creating or extending design systems, component libraries, and reusable interaction patterns.
- Comfort moving between product UX, frontend architecture, and brand/communication design without treating any of them as someone else's problem.
- The ability to work closely with engineers on data models, APIs, state, performance, and technical constraints.
- High agency, pace, and attention to detail; you notice weak decisions and unfinished edges and take responsibility for resolving them.
- Excellent written and spoken English and the ability to explain the reasoning behind your work clearly.
- You do not need a particular degree, and we do not care whether you began your career in design or engineering. We care whether you have developed both sets of capabilities to a genuinely high level.
- Experience with data visualization, graph interfaces, diagramming tools, multiplayer applications, developer tools, AI products, simulation software, or other information-dense systems is particularly relevant.
- Experience with SVG, Canvas, WebGL, animation, creative coding, design tokens, Storybook, Next.js, or open-source software is also relevant.
Skills
- React
- TypeScript
- HTML
- CSS
- Data visualization
- Graph interfaces
- Diagramming tools
- Multiplayer applications
- Developer tools
- AI products
- Simulation software
- SVG
- Canvas
- WebGL
- Animation
- Creative coding
- Design tokens
- Storybook
- Next.js
- Open-source software
Location
- London
Work Type
- Hybrid
Salary/Compensations
- £90,000-130,000
Benefits
- Generous equity on top of base salary
About the Company
- HASH is building infrastructure to solve information failure and help everybody make the right decisions.
- Our open-source platform helps organizations turn fragmented information into typed, temporal knowledge and process graphs that support analysis, simulation, optimization, and automation.
- We're building towards world models from a different starting point from most AI labs: explicit representations of real systems, the entities within them, and the processes through which they change.
- Our founders include Joel Spolsky (founder of Stack Overflow and Trello), Jude Allred (formerly CTO of Glitch), and Dei Vilkinsons (formerly CEO of Soho Strategy).