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About the Role

As a senior Product Designer working on Novel AI & World Modeling Interfaces, you will be the steward of our end-to-end product experience. You will establish a robust Figma design system, craft high-fidelity prototypes and production-ready designs, and partner with engineers to ship pixel-perfect features. You will join a cross-functional squad of UX researchers, UI designers, AI scientists, frontend developers, and product managers pushing the limits of what’s possible in the browser, building systems to deliver “Safeguarded AI”.

Responsibilities

Own our Figma design system: produce scalable components, typographic styles, tokens, and documentation for use across multiple high-calibre internal and external teams
Translate user stories into journey maps, wireframes, and polished UI ready for user testing cycles, and later production
Develop intuitive, informative interfaces which enable non-technical users to create models of real world processes, providing abstractions and assistance on top of the complexity of the underlying theory
Build interactive prototypes (Figma/Web) to validate flows and micro-interactions with test users
Facilitate design critiques and collaborate closely with engineering to ensure design intent is faithfully realized
Champion accessibility and inclusive design across typography, color, motion, and copy

Requirements

Demonstrable experience designing complex web apps with a modern design-system mindset
Advanced mastery of Figma: beyond ordinary component libraries, variants, tokens, shared styles, and auto-layout
Strong visual craft (typography, colour, grid) paired with systematic thinking
Comfort prototyping at multiple fidelities and presenting rationale to technical and non-technical stakeholders
Solid understanding of WCAG 2.2 and pragmatic accessibility techniques
Excellent written & verbal English; thrive in async, documentation-heavy culture
Experience designing data-dense products (simulations, modeling, analytics), AI-user interactions, or user-built views and models (e.g. process flows, dashboards)
Hands-on UX research: facilitating questionnaires/workshops, planning studies, analysing insights, turning findings into action
Interest in real-time collaboration (i.e. multiplayer editing) and how it shapes UX patterns

Skills

Figma
Prototyping
UX research
Accessibility
Design systems
Visual design
Collaboration

Location

London, United Kingdom
Berlin, Germany

Work Type

In-person

Experience Level

Senior

Salary/Compensations

£70,000-110,000 base + meaningful equity

Benefits

Leading equity-weighted total compensation
Competitive salaries
Tax-advantaged options
Employer pension contributions
30 days paid flexible leave
Twice-yearly in-person team retreats around the world

About the Company

HASH's open-source platform helps firms integrate both structured and unstructured information into knowledge graphs that support simulating, optimizing and automating processes.
Our mission is to solve information failure, and help everybody make the right decisions.
We prioritize speed, and measure product delivery timelines in hours and days, not months and years.
We value high-energy, high-expectations people who do what they say and say what they mean.
We're committed to building a high-commitment, high-trust environment, and believe that the best teams are most productive together, in-person.
HASH's founders have previously sold companies for hundreds of millions (and billions) of dollars.