UX/UI Designer (Mobile)

📍 Job Overview

Job Title: UX/UI Designer (Mobile)

Company: Aphex

Location: London, United Kingdom

Job Type: FULL_TIME

Category: Product Design / UX/UI

Date Posted: 2026-06-10

Experience Level: 5-10 Years

Remote Status: Remote-First (United Kingdom focus)

🚀 Role Summary

• Spearhead the end-to-end mobile user experience and interface design for the Aphex platform, with a primary focus on the Diary product.

• Design intuitive and robust mobile solutions tailored for field workers in demanding environments, considering constraints like patchy connectivity, outdoor visibility, and the use of PPE.

• Collaborate closely with Flutter engineers and Product Managers to ensure seamless integration of designs and to bridge the quality gap between web and mobile experiences.

• Contribute to the evolution and expansion of Aphex's design system, specifically enhancing mobile components and establishing quality benchmarks.

• Play a pivotal role in shaping the mobile strategy, directly impacting the adoption and commercial success of Aphex's highest-growth product area.

📝 Enhancement Note: While the role is listed as "UX/UI Designer (Mobile)", the responsibilities clearly indicate a Product Designer with a deep specialization in mobile, encompassing strategy, interaction, and visual design, as well as quality assurance. The emphasis on owning the mobile experience and influencing product direction suggests a senior-level contribution.

📈 Primary Responsibilities

• Lead the entire design lifecycle for mobile features within the Aphex platform, from initial concept and user research through to final UI implementation and post-launch analysis.

• Define and iterate on mobile interaction patterns that are both contextually appropriate for construction site users and align with native platform conventions (iOS/Android).

• Design user flows, states, and edge cases that account for the unique operational realities of field workers, including offline capabilities, shared device usage, and accessibility for users in PPE.

• Partner with Flutter development teams to ensure accurate translation of designs into functional, high-fidelity mobile applications, providing detailed specifications and design QA.

• Drive the enhancement of the mobile design system, ensuring consistency, scalability, and adherence to established quality standards across all mobile touchpoints.

• Conduct user research, including site visits, to gather firsthand insights into the challenges and needs of construction teams, informing design decisions and product strategy.

• Collaborate daily with Product Managers to refine feature scope, user stories, and technical feasibility, bringing a strong design thinking perspective to product development.

• Actively participate in design reviews, providing constructive feedback to peers and stakeholders, and championing design quality throughout the development process.

• Contribute to the strategic product roadmap by identifying opportunities for mobile-first innovation and user experience improvements within the construction planning and execution domain.

📝 Enhancement Note: The description emphasizes "end-to-end design" and "owning" mobile experience, suggesting a high degree of autonomy. The mention of "bridging the quality gap" and "building the system" indicates a strategic contribution beyond typical execution.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a strong portfolio demonstrating equivalent practical experience and a solid understanding of design principles, user-centered design methodologies, and interaction design is paramount.

Experience: 4+ years of dedicated product design experience, with a proven track record of successfully designing and shipping complex mobile applications (iOS, Android, or cross-platform).

Required Skills:

• Mobile UX/UI Design Expertise: Demonstrated ability to create intuitive, user-friendly interfaces and seamless user experiences for mobile applications.

• Interaction Design: Strong proficiency in defining user flows, interaction patterns, states, and handling edge cases for complex workflows.

• Product Design Lifecycle: Experience working across the full design process, from initial user research and ideation through to detailed design, prototyping, and quality assurance.

• Platform Constraint Awareness: Ability to design effectively within the specific constraints and guidelines of mobile operating systems (iOS and Android) and hardware capabilities.

• Collaboration & Communication: Excellent written and verbal communication skills, with a remote-first mindset for asynchronous collaboration and feedback.

• Problem-Solving: Proven ability to tackle complex design challenges and develop innovative solutions for non-consumer-focused applications.

• Design System Contribution: Experience contributing to or evolving design systems, with a focus on mobile components and consistency.

Preferred Skills:

• Flutter Development Knowledge: Understanding of Flutter, its capabilities, and cross-platform mobile development constraints.

• Field Worker/Industrial UX: Prior experience designing for user groups such as field workers, industrial operators, or those in non-desk environments.

• Vertical SaaS/B2B Experience: Familiarity with the nuances of designing for business-to-business software solutions.

• Construction/Infrastructure Industry Knowledge: Insights into the workflows, challenges, and terminology of the construction or infrastructure sectors.

• Prototyping Tools Proficiency: Expertise with industry-standard design and prototyping tools (e.g., Figma, Sketch, Adobe XD).

📝 Enhancement Note: The "About You" section explicitly outlines essential and highly valued skills. The "Not looking for" points provide crucial insight into the candidate profile Aphex seeks, emphasizing a focus on interaction and implementation over purely visual aesthetics, and a hands-on, collaborative approach.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Mobile-First Case Studies: Showcase 2-3 detailed case studies focusing on mobile product design projects, ideally for complex workflows or B2B applications.

• End-to-End Design Process: Clearly articulate your role and process from problem definition, user research, ideation, wireframing, prototyping, UI design, to final implementation and iteration.

• Interaction Design Focus: Highlight your approach to defining user flows, states, and handling complex interactions and edge cases within the mobile context.

• Constraint-Based Design: Demonstrate examples where you designed effectively within specific technical or environmental constraints (e.g., offline, limited connectivity, touch targets for gloved hands).

• Visual Design & System Integration: Include examples of your UI design work and how it aligns with or contributes to a design system, showing consistency across platforms if applicable.

• Impact & Outcomes: Quantify the impact of your design work where possible, detailing user adoption, efficiency gains, or positive feedback received.

Process Documentation:

• Workflow Design: Present examples of how you mapped out and optimized complex user workflows for mobile applications.

• System Evolution: Showcase contributions to design systems, detailing how you developed or refined mobile components and established design standards.

• Collaboration & QA: Illustrate your process for collaborating with engineers and participating in design quality assurance (QA) to ensure faithful implementation.

📝 Enhancement Note: Given the emphasis on owning the mobile experience and bridging the quality gap, a portfolio that clearly demonstrates an end-to-end design process for mobile, with a strong emphasis on interaction design and problem-solving for real-world constraints, will be critical.

💵 Compensation & Benefits

Salary Range: Based on the London location, 5-10 years of experience, and the senior nature of the role, the estimated salary range for a UX/UI Designer (Mobile) in London is typically between £60,000 and £85,000 per annum. This range can vary based on the candidate's specific experience, portfolio, and interview performance.

Benefits:

• Remote-First Work Environment: Opportunity to work from anywhere within the United Kingdom, offering significant flexibility.

• Flexible Working Hours: Adaptable schedule to accommodate different time zones and personal needs, with a focus on asynchronous collaboration.

• Annual Offsite: Company-sponsored team gatherings in international locations (e.g., Da Nang in 2025), fostering team connection and culture.

• Strategic Impact: Opportunity to be the first dedicated mobile designer, significantly influencing product direction and career growth.

• Health & Wellness: While not explicitly detailed, typical benefits in tech companies often include comprehensive health insurance, mental health support, and wellness programs.

Working Hours: The role is full-time, with an expectation of approximately 40 hours per week. However, the company promotes flexible working hours and asynchronous collaboration, allowing for greater autonomy in managing one's schedule.

📝 Enhancement Note: The salary range is estimated based on industry benchmarks for experienced Product/UX/UI Designers in London. The provided benefits highlight Aphex's commitment to work-life balance and employee well-being, with a strong emphasis on remote flexibility and team connection through annual offsites.

🎯 Team & Company Context

🏢 Company Culture

Industry: Construction Technology / SaaS. Aphex operates within the burgeoning PropTech and ConstructionTech sectors, focusing on digitizing and modernizing the planning and orchestration layers of major construction projects. Their platform aims to replace outdated manual processes with collaborative, digital tools.

Company Size: Aphex is a growing startup, likely between 50-150 employees based on typical growth stages for companies with enterprise clients and significant funding. This size implies a dynamic environment with opportunities for impact but also requires individuals who are adaptable and comfortable with rapid change.

Founded: Aphex was founded with a vision to revolutionize construction planning. The company's founding thesis centers on owning the planning layer as a gateway to solving adjacent high-friction processes. This foundational principle drives their product development, particularly the expansion into areas like "Diary" for production tracking.

Team Structure:

• The design team is described as small and senior, with the incoming designer being the first to have a dedicated mobile focus. This means the role will involve significant collaboration with existing senior designers and potentially the Head of UX.

• The company operates with a Product-led approach, where Product Managers (PMs) bring user context and designers bring design thinking.

• Close partnership with Flutter engineers is essential for feasibility and implementation fidelity.

• The CEO also acts as Head of Product, indicating a high level of executive involvement in product strategy. Methodology:

• User-Centricity: Aphex aims to build tools that construction teams "love," suggesting a strong emphasis on understanding and meeting user needs, particularly those of field workers.

• Quality Focus: There's a clear ambition to match and exceed the quality of their web experience on mobile, indicating a commitment to high standards in both UX and UI.

• Remote-First & Async Collaboration: The company culture is built around effective remote work, emphasizing clear written communication and asynchronous workflows.

• Iterative Development: The nature of a startup and a new product category implies an iterative approach to product development, with continuous learning and adaptation.

Company Website: https://aphex.co

📝 Enhancement Note: The company culture appears to value ownership, quality, problem-solving, and a user-centric approach, especially for the construction industry. The startup environment offers significant opportunities for direct impact and influence.

📈 Career & Growth Analysis

Operations Career Level: This role is positioned as a Senior Product Designer with a specialized focus on mobile. The emphasis on "owning" the mobile experience, defining standards, and being the "first dedicated mobile designer" suggests a mid-to-senior level with significant autonomy and strategic input. The potential for growth into a "Senior Designer or Mobile Design Lead" role as the team expands is explicitly stated.

Reporting Structure: The designer will report to a senior member of the design team, likely the Head of UX, and will work closely with Product Managers and Flutter Engineers. Direct interaction with the CEO (acting Head of Product) is also highlighted, indicating visibility and influence at the executive level.

Operations Impact: The impact of this role is directly tied to the commercial success of Aphex's "Diary" product, which is identified as the "biggest revenue lever for 2026." The quality of the mobile capture experience, which this designer will own, is critical for user adoption and therefore revenue. The role also contributes to building out the company's design system and establishing best practices for mobile design within the organization.

Growth Opportunities:

• Leadership Track: Clear pathway to becoming a Senior Designer or Mobile Design Lead, with potential to build and manage a mobile design function as the company scales.

• Skill Specialization: Deepen expertise in mobile UX/UI design, particularly for complex B2B/SaaS applications and challenging user environments. Opportunity to gain experience with Flutter and cross-platform development constraints.

• Strategic Influence: Direct involvement in product strategy and roadmap discussions, influencing the direction of the company's core revenue-generating product.

• Industry Expertise: Develop specialized knowledge in ConstructionTech and the unique design challenges of serving field workers and the infrastructure sector.

• Mentorship: Opportunity to mentor junior designers as the team grows and to learn from senior leadership.

📝 Enhancement Note: The role offers a significant opportunity for career advancement, moving from a senior individual contributor role to potential leadership, with direct influence on a key product and revenue stream.

🌐 Work Environment

Office Type: The role is designated as "Remote-First," with a primary focus on candidates within the United Kingdom. This indicates a strong emphasis on distributed work and asynchronous collaboration, rather than requiring a physical office presence.

Office Location(s): While the role is remote, the company operates across UK, Europe, and Australia time zones, suggesting a globally distributed team. The primary focus for this role is the United Kingdom.

Workspace Context:

• Distributed Collaboration: The work environment is set up for effective remote collaboration, requiring strong written communication skills and comfort with asynchronous tools and workflows.

• Tooling: While specific tools aren't detailed, it's implied that standard design and collaboration software (e.g., Figma, Slack, project management tools) will be utilized.

• Cross-Functional Interaction: Expect frequent interaction with Product Managers, Flutter Engineers, and other designers, fostering a collaborative and iterative design process.

• Field Exposure: The role encourages site visits to construction sites, providing direct exposure to the user environment and enabling a deeper understanding of user needs and constraints.

Work Schedule: Flexible working hours are a key component of the work environment, supporting asynchronous collaboration across different time zones. While full-time (approx. 40 hours/week) is expected, the emphasis is on output and effective communication rather than strict adherence to a 9-to-5 schedule.

📝 Enhancement Note: The remote-first nature combined with the encouragement of site visits creates a unique work environment that balances flexibility with practical, hands-on user research.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: Likely a review of your CV and portfolio to assess experience, skills, and alignment with the role requirements.

• Portfolio Presentation & Discussion: A session where you'll walk through your mobile UX/UI case studies, explaining your process, design decisions, and the impact of your work. Expect questions about your problem-solving approach, interaction design skills, and how you handle constraints.

• Design Challenge/Exercise: A practical exercise to assess your design thinking, problem-solving abilities, and execution skills, possibly related to a specific mobile feature or workflow relevant to Aphex's domain. This might involve wireframing, prototyping, or critiquing an existing design.

• Team & Stakeholder Interviews: Meetings with Product Managers, Engineers, and potentially other designers to evaluate your collaboration style, communication skills, and cultural fit. You'll likely discuss how you approach cross-functional teamwork and contribute to design systems.

• Executive/Leadership Interview: A final discussion, potentially with the CEO/Head of Product, to assess strategic alignment, vision, and overall suitability for the role and company.

Portfolio Review Tips:

• Prioritize Mobile Case Studies: Ensure your portfolio prominently features 2-3 strong mobile design projects. For each, clearly articulate the problem, your role, your process, key design decisions (especially around interaction and constraints), and the outcomes.

• Show, Don't Just Tell: Use visuals, prototypes, and clear explanations to demonstrate your interaction design skills. Highlight how you addressed specific challenges related to field workers or complex workflows.

• Demonstrate Process: Walk through your thought process for each project. Explain why you made certain design choices, referencing user research, platform guidelines, or technical feasibility.

• Highlight System Contributions: If you have experience with design systems, showcase how you've contributed to or utilized them, emphasizing mobile components and consistency.

• Quantify Impact: Wherever possible, use metrics or qualitative feedback to demonstrate the success and impact of your designs.

• Tailor to Aphex: Research Aphex and the construction industry. Be prepared to explain how your skills and experience are relevant to their specific challenges and user base.

Challenge Preparation:

• Understand the Context: Familiarize yourself with the challenges of designing for field workers in construction, including connectivity, device sharing, and outdoor visibility.

• Focus on Interaction: For any design exercise, prioritize clear, efficient, and robust interaction design over pixel-perfect visual polish initially.

• Think Holistically: Consider the entire user journey, potential edge cases, and how your design fits within the broader Aphex platform.

• Communicate Your Thinking: Be prepared to articulate your reasoning and design decisions clearly and concisely, as this is often as important as the final output.

📝 Enhancement Note: The interview process strongly suggests a focus on practical design skills, problem-solving for complex environments, and the ability to work collaboratively within a remote-first, product-focused team. A well-curated portfolio that highlights mobile expertise and a clear design process is crucial.

🛠 Tools & Technology Stack

Primary Tools:

• Design & Prototyping: Figma is the industry standard and highly likely to be the primary tool. Other possibilities include Sketch or Adobe XD. Proficiency in creating detailed mockups, interactive prototypes, and design specifications is expected.

• Collaboration & Communication: Slack for real-time messaging and team communication; Notion or similar for documentation and knowledge sharing; potentially Jira or Asana for task management.

• User Research & Testing: Tools for conducting remote user interviews, usability testing, and potentially heatmapping or analytics platforms for user behavior analysis.

Analytics & Reporting:

• Product Analytics: Platforms like Amplitude, Mixpanel, or Pendo for tracking user engagement, feature adoption, and conversion funnels within the mobile app.

• App Store Analytics: Tools to monitor app performance, downloads, and user reviews on iOS App Store and Google Play Store.

• Dashboarding: Potentially tools like Tableau or Looker for visualizing key product metrics and performance indicators.

CRM & Automation:

• While not directly the responsibility of a UX/UI Designer, understanding how user data flows from the mobile app into CRM systems (like Salesforce, HubSpot) or marketing automation platforms is beneficial for context. Development Stack Context:

• Flutter: The mobile app is built using Flutter. Familiarity with Flutter's design principles and cross-platform capabilities is highly valued, as it directly impacts design feasibility and implementation fidelity.

📝 Enhancement Note: While the role is design-focused, familiarity with the tools and technologies used for analytics, collaboration, and the underlying development framework (Flutter) will enhance a candidate's ability to collaborate effectively and design for optimal implementation.

👥 Team Culture & Values

Operations Values:

• Ownership & Accountability: Taking full responsibility for the mobile experience, from concept to delivery, and driving initiatives to completion.

• Quality & Craftsmanship: A commitment to building high-quality, well-crafted products that meet and exceed user expectations, evidenced by the desire to bridge the web-mobile quality gap.

• User Focus & Empathy: Deeply understanding the needs and challenges of construction field workers and designing solutions that genuinely improve their daily workflows.

• Collaboration & Transparency: Working effectively with cross-functional teams (PMs, Engineers, other Designers) in an open, honest, and asynchronous manner.

• Problem Solving & Innovation: Embracing complex challenges and proactively seeking innovative solutions within a new product category.

Collaboration Style:

• Asynchronous First: A strong emphasis on clear, written communication and documentation to facilitate effective collaboration across different time zones.

• Cross-Functional Partnership: Close working relationships with Product Managers for user context and feature scoping, and with Flutter Engineers for design feasibility and implementation fidelity.

• Design System Driven: A collaborative approach to evolving and maintaining the design system, ensuring consistency and efficiency across the product.

• Feedback Culture: A willingness to give and receive constructive feedback openly to continuously improve designs and processes.

📝 Enhancement Note: The team culture appears to be highly collaborative, results-oriented, and user-centric, with a strong emphasis on remote work best practices and a shared commitment to product quality and innovation.

⚡ Challenges & Growth Opportunities

Challenges:

• Designing for Extreme Constraints: Adapting designs for users in demanding field environments (PPE, outdoor visibility, patchy connectivity, shared devices) presents a significant, ongoing challenge.

• Bridging Web-Mobile Quality Gap: Elevating the mobile UX/UI to match the established quality of the web platform requires meticulous attention to detail and strategic design thinking.

• Establishing Mobile Design Standards: As the first dedicated mobile designer, defining and implementing best practices and evolving the mobile design system from the ground up will be a key challenge.

• Navigating Ambiguity: Working in a new product category and a growing startup environment means dealing with inherent ambiguity and evolving requirements.

Learning & Development Opportunities:

• Mobile Design Specialization: Deepen expertise in mobile UX/UI, particularly for complex B2B applications and challenging user contexts.

• Flutter Ecosystem: Gain practical understanding and potentially hands-on experience with Flutter development principles and cross-platform design considerations.

• Product Strategy Influence: Develop skills in influencing product direction and contributing to strategic roadmap decisions by owning a critical revenue-generating product area.

• Leadership Potential: Build a foundation for future leadership roles by defining mobile design standards and potentially leading a mobile design team.

• Industry Insight: Gain valuable experience and knowledge within the ConstructionTech sector, a rapidly growing and digitally transforming industry.

📝 Enhancement Note: The role offers significant opportunities to tackle complex design problems, shape product strategy, and grow into a leadership position within a dynamic startup environment.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you had to design for users with significant environmental or technical constraints (e.g., poor connectivity, limited screen real estate, specific hardware limitations). How did you approach it, and what was the outcome?" (Focus on demonstrating problem-solving for field workers.)

• "How would you approach bridging the quality gap between an established web application and a mobile experience? What are the key considerations?" (Highlight your understanding of platform differences and your quality-driven approach.)

• "Walk me through your process for defining and evolving a design system, specifically for mobile components. How do you ensure consistency and scalability?" (Prepare to discuss your systematic approach to design.)

• "Imagine you've identified a significant usability issue in the current Diary mobile app. How would you go about validating this issue, proposing a solution, and working with engineers to implement it?" (Showcase your end-to-end design process and collaboration skills.) Company & Culture Questions:

• "What interests you most about Aphex and the construction technology industry?" (Research Aphex's mission, products, and the challenges of construction.)

• "How do you approach asynchronous collaboration in a remote-first environment? What are your best practices for clear communication?" (Demonstrate your understanding of remote work dynamics.)

• "Describe a situation where you had to push back on a stakeholder or engineer regarding a design decision. How did you handle it, and what was the result?" (Assess your ability to advocate for design and manage stakeholder relationships.)

• "How do you stay updated on the latest mobile design trends and best practices, especially those relevant to B2B or industrial applications?" (Show your commitment to continuous learning.) Portfolio Presentation Strategy:

• Structure Your Narrative: For each case study, clearly define the problem, your specific role, your process (research, ideation, design, testing), key decisions, and the measurable impact.

• Emphasize Mobile UX/UI: Focus on the mobile-specific challenges and solutions within your projects. Showcase your interaction design skills through flows, wireframes, and interactive prototypes.

• Highlight Constraint Handling: Explicitly point out instances where you designed for real-world limitations relevant to field users.

• Show System Thinking: If applicable, demonstrate how your designs contribute to or align with a design system.

• Be Concise and Engaging: Practice your presentation to ensure it flows well and stays within the allotted time. Be prepared for Q&A and to dive deeper into specific aspects of your work.

📝 Enhancement Note: The interview preparation focuses on practical application of design skills, strategic thinking, and cultural fit, with a strong emphasis on the unique challenges of Aphex's market and user base.

📌 Application Steps

To apply for this UX/UI Designer (Mobile) position:

• Submit your application through the provided link on Ashby.

• Curate Your Portfolio: Ensure your portfolio prominently features 2-3 strong mobile product design case studies. Prioritize projects that showcase your end-to-end process, interaction design skills, and ability to design for complex workflows or challenging user environments.

• Tailor Your Resume: Highlight your 4+ years of product design experience, emphasizing mobile design, interaction design, and any experience relevant to B2B SaaS, vertical SaaS, or the construction industry. Quantify achievements where possible.

• Prepare Your Narrative: Practice walking through your portfolio case studies, focusing on clearly articulating your problem-solving approach, design decisions, and the impact of your work. Be ready to discuss how you handle constraints and collaborate with engineering teams.

• Research Aphex: Understand Aphex's mission, their product suite (especially Diary), their target market (construction), and their company culture. Be prepared to articulate why you are a good fit for their specific challenges and remote-first 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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