Product Designer (UX/UI)

📍 Job Overview

Job Title: Product Designer (UX/UI)

Company: HASH

Location: London, United Kingdom

Job Type: Full-Time

Category: Product Design / UX/UI

Date Posted: August 31, 2026

Experience Level: Mid-Senior Level (5-10 years inferred)

Remote Status: On-site

🚀 Role Summary

• Design and own the end-to-end product experience for Novel AI & World Modeling Interfaces, focusing on creating intuitive and informative user interfaces.

• Establish and maintain a robust Figma design system, including scalable components, typographic styles, and tokens, ensuring consistency across internal and external teams.

• Translate complex user stories into detailed journey maps, wireframes, and high-fidelity UI designs, ready for user testing and production.

• Develop interactive prototypes using Figma and web technologies to validate user flows and micro-interactions with test users.

• Collaborate closely with a cross-functional team of UX researchers, UI designers, AI scientists, frontend developers, and product managers to deliver pixel-perfect features.

📝 Enhancement Note: The role is explicitly for a Product Designer focused on "Novel AI & World Modeling Interfaces," indicating a specialized area within UX/UI design. The emphasis on "Safeguarded AI" and "knowledge graphs" suggests a need for designers comfortable with complex, data-driven, and potentially abstract concepts. The company's mission to "solve information failure" and their high-performance culture ("measure performance by output," "prioritize speed") implies a need for proactive, results-oriented designers.

📈 Primary Responsibilities

• Own and evolve the comprehensive Figma design system, producing reusable components, typographic styles, design tokens, and clear documentation for multi-team adoption.

• Transform user stories into detailed journey maps, wireframes, and polished UI designs, preparing them for iterative user testing cycles and subsequent production readiness.

• Develop intuitive and informative interfaces that empower non-technical users to effectively model real-world processes, abstracting complexity and supporting underlying theory.

• Construct interactive prototypes within Figma and potentially web-based environments to rigorously validate user flows and intricate micro-interactions with target users.

• Actively facilitate design critiques and maintain close collaboration with the engineering team to ensure accurate implementation of design intent and visual fidelity.

• Champion and embed accessibility best practices across all design elements, including typography, color palettes, motion design, and microcopy, adhering to WCAG 2.2 standards.

📝 Enhancement Note: The responsibilities highlight a deep dive into design system management and user empowerment through intuitive interfaces for complex modeling tasks. The mention of "non-technical users" creating models of "real world processes" suggests a need for excellent information architecture and user education within the design. The emphasis on "Safeguarded AI" implies a focus on trust, transparency, and control in the user interface.

🎓 Skills & Qualifications

Education: While no specific degree is listed, a Bachelor's degree in Design, Human-Computer Interaction, Computer Science, or a related field is typically expected for this level of role. A strong portfolio demonstrating equivalent practical experience will also be considered.

Experience: 5-10 years of professional experience in Product Design, UX/UI Design, with a significant focus on complex web applications and modern design system methodologies.

Required Skills:

• Demonstrable experience designing and scaling complex web applications with a modern design-system mindset.

• Advanced mastery of Figma, extending beyond basic component libraries to proficient use of variants, tokens, shared styles, and auto-layout for efficient design workflows.

• Strong visual design craft, encompassing typography, color theory, and grid systems, coupled with robust systematic thinking for scalable design solutions.

• Proficiency in prototyping at multiple fidelities and confidently presenting design rationale to both technical and non-technical stakeholders.

• Solid understanding of WCAG 2.2 guidelines and practical application of accessibility techniques in design.

• Excellent written and verbal English communication skills, with a proven ability to thrive in an asynchronous, documentation-heavy work culture. Preferred Skills:

• Experience designing data-dense products such as simulations, modeling tools, or advanced analytics dashboards.

• Proven experience with AI-user interactions or designing interfaces for user-generated models and process flows.

• Hands-on experience with UX research methodologies, including planning and conducting studies, analyzing insights, and translating findings into actionable design improvements.

• Familiarity with real-time collaboration features (e.g., multiplayer editing) and their impact on user experience patterns.

📝 Enhancement Note: The "Must have" section emphasizes deep Figma proficiency and a systematic approach to design systems, crucial for a company building scalable platforms. The "Nice to have" skills point towards a desire for candidates who can bridge the gap between complex data, AI, and user needs, and who can contribute to research efforts. The explicit mention of asynchronous and documentation-heavy culture suggests a need for strong self-management and communication skills.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase end-to-end product design projects, detailing the problem, your process, and the impact of your solutions, with a focus on complex web applications.

• Highlight specific examples of your involvement in building or significantly contributing to design systems, demonstrating component creation, token implementation, and documentation.

• Include case studies that illustrate your ability to translate user stories into wireframes, prototypes, and high-fidelity UI designs, particularly for data-dense or AI-related interfaces.

• Demonstrate your systematic thinking and visual craft through well-articulated design decisions and a strong aesthetic sensibility.

• Present projects that showcase your understanding and application of WCAG 2.2 accessibility standards. Process Documentation:

• Provide clear documentation of your design process within case studies, outlining user research methodologies, ideation phases, wireframing, prototyping, and user testing cycles.

• Illustrate how you collaborate with engineering and product management teams to ensure design fidelity and successful feature implementation.

• Detail your approach to iterative design, including how you incorporate feedback from critiques and user testing to refine designs.

• Showcase your ability to document and maintain design systems for ongoing scalability and team adoption.

📝 Enhancement Note: For a role heavily focused on design systems and complex applications, the portfolio should strongly emphasize scalability, component-based design, and the ability to manage design assets effectively. Case studies demonstrating the translation of abstract concepts (like AI and world modeling) into tangible user interfaces will be highly valued.

💵 Compensation & Benefits

Salary Range: £70,000 - £110,000 base salary per annum.

Benefits:

• Equity-weighted total compensation, including competitive salaries and tax-advantaged options.

• Employer pension contributions.

• 30 days of paid flexible leave.

• Twice-yearly in-person team retreats held globally.

Working Hours: The standard working hours are 40 hours per week, consistent with full-time employment. The company culture emphasizes output and speed, suggesting a focus on results rather than strict adherence to hours, but a consistent presence in the London office is expected.

📝 Enhancement Note: The salary range is explicitly stated and competitive for a senior Product Designer role in London. The benefits package is attractive, with a strong emphasis on equity, flexible leave, and unique team-building retreats, aligning with a high-performance, high-trust environment. The "meaningful equity" component is a significant draw for candidates seeking long-term value.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology, specifically focused on Knowledge Graphs, AI, and Process Simulation/Optimization. HASH operates in a niche but rapidly growing sector at the intersection of data science, AI, and enterprise software.

Company Size: HASH is likely a growing, venture-backed startup or scale-up, given the emphasis on speed, output, and the founders' previous success. The culture is described as "high-energy, high-expectations" and "high-commitment, high-trust."

Founded: The founding date is not explicitly stated, but the mention of founders having previously sold companies for substantial amounts suggests a relatively established, though potentially still agile, organization.

Team Structure:

• The Product Design role sits within a cross-functional "squad" comprising UX researchers, UI designers, AI scientists, frontend developers, and product managers.

• This squad structure suggests an agile, collaborative environment focused on specific product initiatives.

• The emphasis on in-person collaboration implies a close-knit team working together in the London office. Methodology:

• Data-driven & Output-focused: The company measures performance by output and prioritizes speed in product delivery. This translates to a focus on actionable insights and efficient workflows.

• Systematic Design: The emphasis on design systems, tokens, and documentation points to a systematic and scalable approach to product development.

• High-Trust, High-Commitment: The culture fosters an environment where individuals are trusted to deliver and are committed to the team's success, working collaboratively in person.

Company Website: hash.ai

📝 Enhancement Note: HASH's culture is characterized by its intensity, speed, and a strong belief in in-person collaboration. The focus on solving "information failure" through knowledge graphs and AI suggests a mission-driven team tackling complex, impactful problems. The organizational structure likely mimics agile development methodologies, with cross-functional squads.

📈 Career & Growth Analysis

Operations Career Level: This role is positioned as a Senior Product Designer, implying a significant level of autonomy and responsibility. It is suitable for individuals with 5-10 years of experience who can lead design initiatives, mentor junior designers (if any), and influence product strategy.

Reporting Structure: The designer will likely report to a Head of Design, Design Lead, or Head of Product. They will work closely with Product Managers and Engineering Leads within their cross-functional squad.

Operations Impact: The Product Designer will have a direct and significant impact on the usability and adoption of HASH's core platform, particularly its AI and world modeling interfaces. By creating intuitive and powerful tools, they will enable users to better understand and optimize processes, directly contributing to the company's mission of solving information failure and driving better decision-making.

Growth Opportunities:

• Design Leadership: Potential to grow into a Lead Product Designer or Design Manager role, overseeing multiple squads or the entire design function as the company scales.

• Specialization: Deepen expertise in AI interfaces, data visualization, knowledge graph design, or complex system modeling.

• Technical Acumen: Develop a stronger understanding of AI science, knowledge graph technologies, and frontend development through close collaboration.

• Strategic Influence: Contribute to product strategy and roadmap development based on user insights and design expertise.

📝 Enhancement Note: The senior-level designation and the company's rapid growth trajectory suggest ample opportunities for career advancement. The role offers a chance to specialize in cutting-edge areas like AI interfaces and knowledge graphs, which are highly valuable in the current tech landscape.

🌐 Work Environment

Office Type: HASH operates with a strong preference for in-office collaboration, emphasizing that "the best teams are most productive together, in-person." This indicates a traditional office setup rather than a remote-first or hybrid model where remote work is the primary mode.

Office Location(s): The primary location for this specific opening is London, United Kingdom. HASH also has an office in Berlin, Germany, for the same position.

Workspace Context:

• Collaborative Environment: The office is designed to foster close collaboration among team members within squads and across functions. Expect shared workspaces, meeting rooms, and common areas conducive to spontaneous discussions and brainstorming.

• Tools & Technology: Access to industry-standard design tools like Figma, prototyping software, and potentially collaboration platforms for asynchronous communication. The company's focus on speed and output suggests a well-equipped environment with efficient technology.

• Team Interaction: Frequent opportunities for direct interaction with UX researchers, UI designers, AI scientists, engineers, and product managers, facilitating rapid feedback loops and collective problem-solving.

Work Schedule: While the standard is 40 hours per week, the company's culture prioritizes output and speed. This means the focus is on achieving results and delivering product features efficiently, rather than strictly clocking hours. The expectation of in-office work suggests a typical workday during business hours, with flexibility likely afforded based on individual productivity and team needs.

📝 Enhancement Note: The emphasis on in-person collaboration is a defining characteristic of HASH's work environment. Candidates should be prepared for a dynamic, office-centric culture where teamwork and direct communication are paramount.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A review of your resume and portfolio to assess alignment with the role's requirements, particularly Figma proficiency and design system experience.

• Portfolio Deep Dive: An interview focused on your portfolio, where you'll present key projects, explain your design process, rationale, and the impact of your work. Expect questions about your approach to complex web apps, design systems, and AI/data-dense interfaces.

• Technical/Skills Interview: An assessment of your Figma skills, understanding of accessibility (WCAG 2.2), visual design principles, and systematic thinking. This may involve design challenges or scenario-based questions.

• Cross-functional Team Interview: An opportunity to meet with members of the cross-functional squad (e.g., engineers, product managers, researchers) to assess collaboration style, communication, and cultural fit.

• Final Interview: Likely with a senior leader or founder to discuss strategic alignment, company culture, and career aspirations.

Portfolio Review Tips:

• Showcase Design Systems: Dedicate significant space to your experience building and maintaining design systems. Detail component libraries, token strategies, and documentation processes.

• Highlight Complex Web Apps: Feature projects that demonstrate your ability to design for intricate functionalities, data visualization, or sophisticated user flows.

• Illustrate AI/Modeling Interfaces: If possible, include examples of designs for AI interactions, simulations, or user-created models, explaining the unique challenges and solutions.

• Detail Your Process: For each case study, clearly articulate the problem, your role, research methods, design iterations, and measurable outcomes. Use wireframes, prototypes, and final UI screenshots effectively.

• Emphasize Accessibility: Explicitly mention how you incorporated WCAG 2.2 standards and practical accessibility techniques into your designs.

• Prepare for Figma Mastery Questions: Be ready to discuss advanced Figma features like auto-layout, variants, and component architecture.

Challenge Preparation:

• Design System Exercise: You might be asked to critique an existing design system, propose improvements, or design a new component based on specific requirements.

• Problem-Solving Scenario: A prompt related to designing an interface for a complex AI task or a world modeling tool, requiring you to outline your approach, user flows, and key UI elements.

• Accessibility Audit: You may be asked to review a design for accessibility issues and suggest solutions.

• Presentation Skills: Practice presenting your portfolio and design thinking concisely and compellingly, focusing on clarity and impact.

📝 Enhancement Note: The interview process will heavily scrutinize your practical design skills, especially with Figma and design systems, and your ability to translate complex technical concepts into user-friendly interfaces. A well-curated portfolio that directly addresses these requirements is critical.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: The core design tool, with advanced proficiency required for component libraries, variants, tokens, and auto-layout. This is central to the role.

• Prototyping Tools: Figma's built-in prototyping capabilities, potentially supplemented by other web-based prototyping tools for interactive validation.

Analytics & Reporting:

• While not a direct responsibility, understanding how designs impact user behavior and key metrics will be crucial. Familiarity with analytics tools (e.g., Amplitude, Mixpanel, Google Analytics) used by the product team would be beneficial.

• Data Visualization Libraries/Tools: Awareness of how data is presented visually in complex applications.

CRM & Automation:

• Not directly applicable to the Product Designer role, but understanding how user data is managed and how design choices influence CRM interactions or automated workflows could be advantageous.

📝 Enhancement Note: The technology stack heavily emphasizes Figma as the primary tool. Proficiency here is non-negotiable. While direct responsibility for analytics or CRM tools is unlikely, an understanding of how design impacts these systems and user metrics is a significant plus.

👥 Team Culture & Values

Operations Values:

• Speed & Output: A strong emphasis on rapid product delivery and measurable performance. Designs should be efficient and contribute directly to business outcomes.

• High Expectations & Commitment: A culture that values high performers who are dedicated, proactive, and deliver on their commitments.

• High Trust & Collaboration: An environment where team members are trusted to do their best work and collaborate closely, emphasizing in-person interaction.

• Systematic & Scalable Design: A preference for well-documented, component-based design solutions that can scale across the platform.

• Solving Information Failure: A core mission driving the company's work, encouraging a focus on creating impactful and insightful user experiences.

Collaboration Style:

• In-Person Focused: The company strongly believes in the productivity and effectiveness of in-person collaboration, suggesting a dynamic, communicative office environment.

• Cross-functional Squads: Designers work within agile teams, integrating closely with researchers, AI scientists, engineers, and product managers.

• Documentation-Heavy: A culture that relies on thorough documentation for asynchronous communication and knowledge sharing, ensuring clarity and efficiency.

• Design Critiques: Regular participation in design reviews to solicit feedback and refine designs collaboratively.

📝 Enhancement Note: The core values revolve around performance, efficiency, and collaborative, in-person teamwork. The mission to solve information failure provides a strong sense of purpose that likely unifies the team.

⚡ Challenges & Growth Opportunities

Challenges:

• Designing for Complexity: The primary challenge will be translating complex AI concepts and world modeling principles into intuitive, accessible interfaces for potentially non-technical users.

• Balancing Speed and Quality: Adhering to HASH's rapid development timelines while maintaining high standards for design quality, accessibility, and user experience.

• Evolving Design System: Continuously evolving and scaling the Figma design system to meet the growing needs of the platform and multiple teams.

• Cross-functional Alignment: Ensuring seamless collaboration and alignment across diverse disciplines (AI science, engineering, research) to deliver cohesive product experiences.

Learning & Development Opportunities:

• AI & Knowledge Graph Expertise: Opportunity to gain deep domain knowledge in cutting-edge AI technologies and knowledge graph applications.

• Advanced Design System Management: Hone skills in creating and managing sophisticated, scalable design systems.

• User Research & Strategy: Develop hands-on UX research skills if desired, contributing to a more data-informed design process.

• Leadership Development: Potential to grow into design leadership roles, mentoring junior designers and influencing product direction.

📝 Enhancement Note: The role presents significant intellectual challenges in designing for complex AI domains. However, these challenges are balanced by substantial opportunities for professional growth in specialized, high-demand areas of product design.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you designed a complex web application. What were the key challenges, and how did you ensure a scalable and user-friendly experience?" (Focus on systematic thinking, design systems, and problem-solving.)

• "Walk us through your process for creating and maintaining a Figma design system. What are your principles for component architecture, variants, and token usage?" (Highlight advanced Figma skills and systematic approach.)

• "How would you approach designing an interface for users to model real-world processes using AI? What are the critical user needs and potential complexities?" (Demonstrate understanding of user-centric design for complex domains.)

• "Tell us about a project where you championed accessibility. How did you integrate WCAG 2.2 principles into your design process?" (Showcase commitment to inclusive design.) Company & Culture Questions:

• "What interests you about HASH's mission to solve information failure and our work in AI and knowledge graphs?" (Research the company and articulate genuine interest.)

• "How do you thrive in a fast-paced, output-driven environment? How do you prioritize your work?" (Align with the company's culture of speed and efficiency.)

• "What are your expectations regarding in-person collaboration and team interaction?" (Confirm understanding and enthusiasm for the office-centric model.) Portfolio Presentation Strategy:

• Structure is Key: Organize your portfolio logically, with clear case studies for 2-3 significant projects. Start with a high-level overview and then dive into details.

• Tell a Story: For each project, articulate the problem, your role, the process (research, ideation, design, testing), your design decisions, and the impact/outcomes.

• Figma Mastery Showcase: Be prepared to demonstrate your Figma skills live or discuss advanced techniques used in your projects, especially regarding design systems.

• Quantify Impact: Where possible, use metrics to demonstrate the success of your designs (e.g., improved conversion rates, reduced user errors, increased task completion time).

• Emphasize Collaboration: Highlight instances where you worked effectively with engineers, product managers, and other stakeholders.

📝 Enhancement Note: Prepare to articulate your design process with a strong emphasis on systematic thinking, Figma proficiency, and the ability to design for complex, data-intensive applications, particularly those involving AI. Demonstrating an understanding of HASH's specific mission and culture will be crucial.

📌 Application Steps

To apply for this Product Designer position:

• Submit your application through the provided link on jobs.gem.com.

• Customize Your Resume: Tailor your resume to highlight your experience with complex web apps, Figma proficiency, design system development, and any experience with AI or data-dense products. Use keywords from the job description.

• Curate Your Portfolio: Ensure your portfolio prominently features projects showcasing your design system expertise, advanced Figma skills, and examples of designing for complex interfaces. Prioritize quality and relevance over quantity.

• Prepare Your Presentation: Practice walking through your key portfolio projects, focusing on articulating your design process, rationale, and the impact of your work, especially for Figma and design system-related aspects.

• Research HASH: Understand the company's mission, technology (knowledge graphs, AI), and culture (speed, output, in-person collaboration). Be ready to discuss why you are a good fit for their specific environment.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.

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