Senior UI Designer - B2C Mobile (f/m/x)

📍 Job Overview

Job Title: Senior UI Designer - B2C Mobile (f/m/x)

Company: exmox

Location: Hamburg, Germany

Job Type: Permanent employee

Category: Product Design / UI/UX Design

Date Posted: June 26, 2026

Experience Level: Mid-Senior Level (5+ years)

Remote Status: Hybrid

🚀 Role Summary

• Lead the design of user interfaces for a high-growth B2C mobile application, impacting millions of users globally in the competitive mobile gaming industry.

• Own the complete feature design lifecycle, from conceptualization and wireframing to polished UI design and seamless developer handoff.

• Contribute significantly to the development, maintenance, and evolution of a comprehensive design system.

• Collaborate closely with UX research and data analytics teams to leverage user behavior insights and performance metrics for design iteration and optimization.

• Create engaging, habit-forming interfaces that align with business goals and drive key performance indicators (KPIs) for user acquisition and engagement.

📝 Enhancement Note: This role is positioned within a dynamic, high-growth tech company focused on user acquisition in the mobile gaming sector. The emphasis on "performing experiences" and "designing for engagement and revenue" indicates a strong connection to business outcomes, differentiating it from purely aesthetic UI design roles. The "Senior" title implies a need for leadership in design thinking and process within the team.

📈 Primary Responsibilities

• Conceptualize, design, and deliver visually engaging and highly polished user interfaces for the company's B2C mobile application.

• Take full ownership of new features, guiding them from initial concept and user flow definition through to final design specifications and production-ready assets.

• Develop, maintain, and contribute to the company's design system, ensuring consistency and scalability across multiple brands and product lines.

• Create necessary visual assets, including illustrations, iconography, and animations, to enhance the user experience and brand identity.

• Prepare and deliver production-ready assets, detailed specifications, interactive prototypes, and clear documentation for engineering teams to ensure accurate implementation.

• Conduct design reviews to meticulously ensure that implemented features align with design intent and quality standards.

• Actively collaborate with UX researchers to gather user insights and with data teams to analyze performance metrics, informing design decisions and iterative improvements.

• Champion best practices in UI design, motion design, interaction design, accessibility, and usability within the product design team.

• Contribute to defining and documenting brand identities and ensuring adherence to established tone, voice, and messaging guidelines.

📝 Enhancement Note: The emphasis on "multi-brand products and theming systems" suggests the candidate will work with a flexible design system capable of supporting different brand identities within the exmox ecosystem, requiring a nuanced understanding of brand application and white-label solutions.

🎓 Skills & Qualifications

Education: While not explicitly stated, a Bachelor's degree in Graphic Design, Interaction Design, Human-Computer Interaction, or a related field is typically expected for senior design roles. Equivalent practical experience will also be considered.

Experience: Minimum of 5 years of professional experience in product teams as a UI, UI/UX, or Product Designer, with a proven track record in designing consumer-facing mobile applications.

Required Skills:

• A strong portfolio showcasing exceptional mobile UI craft, visual design expertise, and a deep understanding of user-centered design principles.

• Proficiency in industry-standard design and prototyping tools, with a primary emphasis on Figma.

• Expertise in motion design, animation, and transitions to create dynamic and engaging user interfaces.

• Proven ability to create high-quality visual assets, including illustrations and iconography.

• Experience in designing, implementing, and maintaining design systems for scalability and consistency.

• Demonstrated experience in designing habit-forming and engaging consumer-facing interfaces.

• Strong knowledge of accessibility standards (e.g., WCAG) and usability principles to ensure inclusive design.

• Understanding of front-end technologies and implementation constraints to facilitate effective developer handoff.

• Fluency in English, both written and verbal. Preferred Skills:

• Experience in marketing, gaming, or other B2C-heavy industries.

• Experience with multi-brand products, white-label solutions, and theming systems.

• Experience in defining, designing, and documenting brand identities.

• Experience in copywriting, including defining tone, voice, and messaging.

• German language proficiency.

📝 Enhancement Note: The requirement for "5+ years of experience" and the emphasis on "ownership," "impact," and "design system contribution" suggest this role is for a designer ready to take on significant responsibility and influence the design direction, rather than a junior or mid-level individual contributor. The mention of "white-label products and theming systems" is a critical differentiator, implying the need for versatility in applying design principles across potentially different brand aesthetics.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• A comprehensive portfolio that clearly demonstrates outstanding mobile UI craft and visual design skills.

• Case studies showcasing end-to-end feature ownership, from problem definition and ideation through to final design and measurable impact.

• Examples of designing for habit-forming consumer products, with an emphasis on user engagement and retention strategies.

• Evidence of creating and maintaining design systems, including examples of component libraries, style guides, and their application.

• Work that highlights expertise in motion design and interaction design, illustrating how these elements enhance user experience.

• Demonstrations of visual asset creation capabilities, such as custom icons and illustrations that align with brand guidelines. Process Documentation:

• Showcase a structured approach to the design process, including user research integration, ideation techniques, wireframing, prototyping, and user testing methodologies.

• Illustrate how you collaborate with cross-functional teams (product managers, engineers, researchers, data analysts) throughout the design lifecycle.

• Provide examples of developer handoff processes, including the creation of detailed specifications, asset delivery, and ongoing collaboration with engineering.

• Demonstrate how you leverage data and user feedback to iterate on designs and drive improvements, linking design decisions to business KPIs.

📝 Enhancement Note: The portfolio is crucial for this role, not just for showcasing visual skills but also for demonstrating a structured, data-informed design process, an understanding of system-level design (design systems), and experience in a high-impact B2C environment. Candidates should be prepared to articulate the "why" behind their design choices and their impact on business outcomes.

💵 Compensation & Benefits

Salary Range: Based on industry benchmarks for Senior UI Designers in Hamburg, Germany, with 5+ years of experience and expertise in mobile B2C product design, the estimated annual salary range would be €65,000 - €85,000. This estimate accounts for the cost of living in Hamburg, the company's growth-stage, and the specialized skill set required.

Benefits:

• Transport Subsidy: Financial assistance for commuting to the office.

• Learning Budget: Dedicated funds for professional development, training, conferences, and skill enhancement.

• Wellness and Gym: Support for physical and mental well-being, potentially including gym memberships or wellness programs.

• Workation: Opportunity to work remotely from different locations, blending work and travel.

• Bi-weekly Team Lunches: Regular opportunities for team bonding and informal collaboration.

• Flexible Hybrid Model: Combines remote work (Mondays & Fridays) with in-office presence (Tuesdays, Wednesdays, Thursdays) for collaborative work and team interaction.

Working Hours: The standard working hours are approximately 40 hours per week, with a flexible hybrid model that allows for a balance between remote and in-office work.

📝 Enhancement Note: The salary estimate is based on recent data for similar roles in major German tech hubs like Hamburg, considering the "Senior" level and specialized skills. The benefits package emphasizes professional growth, well-being, and work-life integration, aligning with typical offerings for tech professionals in the region. The explicit mention of a hybrid model with specific office days is a key detail for candidates.

🎯 Team & Company Context

🏢 Company Culture

Industry: Mobile Gaming / User Acquisition Platform. Exmox operates within the highly competitive and rapidly evolving mobile gaming industry, focusing on a scalable user acquisition platform. This context implies a fast-paced, data-driven, and performance-oriented environment where innovation and continuous improvement are paramount.

Company Size: While not explicitly stated in the provided data, the mention of "hyper-growth," "spearheading one of the largest innovations," and a "growing design maturity" suggests a company that has moved beyond the startup phase and is in a significant scaling phase, likely employing between 50-250 employees.

Founded: The founding date is not provided, but the company's positioning as a "next European tech challenger" and its focus on "hyper-growth" indicates it is a relatively modern company, likely founded within the last 5-10 years.

Team Structure:

• The Product Design team is composed of Product Designers, UI Designers, and UX Researchers, indicating a collaborative and specialized design function.

• The Senior UI Designer will likely report into a Head of Product Design or a Design Lead, working within a broader Product or Engineering department.

• Cross-functional collaboration is a core tenet, with close partnerships expected with Product Management, Engineering, UX Research, and Data Analytics teams. Methodology:

• Data-driven decision-making is central, with designs tested and iterated upon based on real user insights and performance metrics.

• A focus on experimentation and iteration is inherent, allowing designers to see the direct impact of their work on business KPIs.

• The team is in a phase of "growing maturity," suggesting an active effort to formalize processes, elevate design standards, and integrate design more deeply into product development.

Company Website: exmox.com

📝 Enhancement Note: The company culture is explicitly described as not being "built for comfort" but rather for "growth, performance, and impact." This signals a demanding yet rewarding environment for ambitious individuals. The user acquisition focus in mobile gaming means design decisions are directly tied to business growth and revenue, requiring a strong understanding of conversion optimization and engagement loops.

📈 Career & Growth Analysis

Operations Career Level: This role is a "Senior" position, indicating a level of expertise, autonomy, and responsibility beyond that of a mid-level designer. Senior designers are expected to lead feature design, contribute to strategic product discussions, mentor junior team members, and significantly influence the design system and overall design quality.

Reporting Structure: The Senior UI Designer will likely report to a Design Lead or Head of Product Design. They will collaborate closely with Product Managers, Software Engineers, UX Researchers, and Data Analysts, forming cross-functional teams for feature development.

Operations Impact: The impact of this role is directly tied to the performance of exmox's B2C mobile product, which reaches over 25 million users. Designs are expected to drive user engagement, habit formation, and ultimately, key business KPIs related to user acquisition and revenue. The data-driven culture ensures that design impact is measurable and visible.

Growth Opportunities:

• Skill Advancement: Opportunities to deepen expertise in mobile UI design, motion design, interaction design, and design system management. Potential to lead design initiatives within specific product areas.

• Leadership Development: As the design team matures, there will be opportunities to take on more leadership responsibilities, such as mentoring junior designers, leading design critiques, and contributing to design strategy.

• Career Progression: Potential pathways could lead to Lead UI Designer, Senior Product Designer, or even Design Manager roles as the company continues its hyper-growth trajectory. Exposure to a "European tech challenger" environment offers unique experience relevant to future leadership roles.

📝 Enhancement Note: The "Senior" title and the company's growth phase suggest significant opportunities for career progression. Candidates should look for opportunities to shape processes, mentor others, and take on more strategic design responsibilities. The emphasis on "ownership" and "impact" means that demonstrating initiative and tangible results will be key for advancement.

🌐 Work Environment

Office Type: The role operates on a hybrid model, meaning a blend of remote work and in-office presence. The office is located in Hamburg, Germany, at Rödingsmarkt 39. The office days (Tuesday, Wednesday, Thursday) are likely dedicated to collaborative activities, team meetings, and cross-functional work.

Office Location(s): Rödingsmarkt 39, 20459 Hamburg, Germany. This central Hamburg location offers good accessibility for employees within the city and surrounding areas.

Workspace Context:

• Collaborative Environment: The hybrid model, with dedicated office days, fosters in-person collaboration, brainstorming sessions, and easier communication with colleagues across product, design, and engineering teams.

• Tools and Technology: While not explicitly detailed, it's expected that the company provides modern design software (Figma), collaboration tools, and necessary hardware for designers. The emphasis on data means access to analytics dashboards and reporting tools will be integral.

• Team Interaction: The office days provide opportunities for spontaneous interactions, design critiques, and building stronger team cohesion within the product design team and with other departments.

Work Schedule: The standard work week is approximately 40 hours. The hybrid model provides flexibility, with specific days designated for office attendance and others for remote work, allowing for a balance between focused individual work and collaborative team activities.

📝 Enhancement Note: The hybrid model is clearly defined (Mon/Fri remote, Tue/Wed/Thu in office). This structure is designed to maximize the benefits of both remote flexibility and in-person collaboration. Candidates should be prepared for a structured hybrid setup.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A review of your resume and portfolio by the recruitment team or hiring manager to assess qualifications and fit.

• Portfolio Presentation & Design Challenge: A session where you present your portfolio, discussing key projects, your design process, and impact. This may be followed by a take-home or live design challenge focusing on UI design for a mobile B2C product, emphasizing problem-solving and design execution.

• Cross-functional Interviews: Meetings with Product Managers, Engineers, and potentially UX Researchers or Data Analysts to assess collaboration skills, technical understanding, and cultural fit.

• Hiring Manager/Team Lead Interview: A final discussion with the Design Lead or Head of Product Design to evaluate seniority, strategic thinking, and alignment with team goals.

Portfolio Review Tips:

• Focus on Impact: For each project, clearly articulate the problem, your role, your design process, the solutions you implemented, and most importantly, the measurable impact of your designs on user behavior and business KPIs.

• Showcase Mobile UI Craft: Prioritize examples of B2C mobile applications, demonstrating your understanding of mobile patterns, user flows, and visual polish.

• Highlight Design System Contributions: If you've worked on or contributed to design systems, showcase how you've applied them, maintained them, or built components.

• Demonstrate Process: Walk through your thought process, explaining why you made certain design decisions, how you incorporated user feedback and data, and how you collaborated with other teams.

• Tailor to the Role: Emphasize projects that align with exmox's focus on habit-forming interfaces, user acquisition, and data-driven iteration.

Challenge Preparation:

• Understand the Context: If given a challenge, ensure you understand the product, target audience (mobile gamers), and business goals (user acquisition, engagement).

• Focus on Mobile UI/UX Principles: Apply best practices for mobile design, including intuitive navigation, clear calls to action, and visual hierarchy.

• Showcase Your Process: Even in a limited time, articulate your approach, assumptions, and design rationale.

• Consider Data Integration: Think about how data could inform your design decisions or how you would measure the success of your proposed solution.

📝 Enhancement Note: The interview process will heavily weigh the portfolio. Candidates should prepare to not only show their work but also to deeply explain the rationale behind their design choices and the business impact they achieved. The mention of "designing experiences that perform" and "designing flows that drive engagement and revenue" means that a quantifiable approach to design is essential.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: The core tool for UI design, prototyping, and collaboration. Proficiency is essential.

• Prototyping Tools: Likely integrated within Figma or other specialized tools for creating interactive prototypes for user testing and developer handoff.

• Illustration/Asset Creation Tools: Such as Adobe Illustrator or similar software for creating custom icons, illustrations, and other graphical assets.

Analytics & Reporting:

• Data Analytics Platforms: Tools for analyzing user behavior, A/B test results, and performance metrics (e.g., Google Analytics, Amplitude, Mixpanel, or internal BI tools).

• Dashboarding Tools: For visualizing key performance indicators and design impact (e.g., Tableau, Looker, or similar).

CRM & Automation:

• While not directly a designer's tool, an understanding of how UI designs integrate with user acquisition funnels and potentially CRM systems might be beneficial.

• Project Management Tools: Such as Jira, Asana, or Trello for task management, workflow tracking, and collaboration with engineering.

📝 Enhancement Note: Proficiency in Figma is a non-negotiable requirement. Beyond that, familiarity with data analytics platforms and an understanding of how design impacts KPIs in a user acquisition context are critical. The company's data-driven culture means designers will be expected to work closely with data and use it to inform their work.

👥 Team Culture & Values

Operations Values:

• Growth & Impact: A core value is driving business growth and making a significant impact, reflected in the company's hyper-growth ambition and focus on performance.

• Ownership: Employees are expected to take full responsibility for their work, drive initiatives, and deliver meaningful value.

• Performance & Execution: A high bar is set for performance, with a strong emphasis on delivering real results and winning in a competitive market.

• Data-Driven Decisions: Every decision is informed by data, user insights, and performance metrics.

• Continuous Improvement: The team is on a journey to elevate design maturity and constantly seeks ways to improve processes and outcomes.

Collaboration Style:

• Cross-functional Integration: Designers work closely with Product Managers, Engineers, UX Researchers, and Data Analysts, fostering a collaborative environment where diverse perspectives are valued.

• Constructive Feedback: A culture of giving and receiving feedback thoughtfully is encouraged, viewing it as an essential part of iteration and growth.

• Open Communication: The emphasis on ambitious people who "challenge each other openly" suggests a direct and transparent communication style.

• Shared Ambition: The team is united by a clear mission to build a category-leading company and win together.

📝 Enhancement Note: The company culture is characterized by ambition, a strong performance orientation, and a deep reliance on data. Designers are expected to be proactive, take ownership, and collaborate effectively across disciplines. The "not built for comfort" ethos means candidates should be prepared for a challenging but highly rewarding environment.

⚡ Challenges & Growth Opportunities

Challenges:

• Designing for Habit Formation: Creating interfaces that are not only functional but also engaging and habit-forming for millions of users in a competitive mobile gaming market.

• Balancing Multiple Brands/Theming: Potentially designing for a white-label or multi-brand product, requiring the application of design principles across different visual identities while maintaining core functionality and user experience.

• Data-Driven Iteration: Continuously iterating on designs based on complex user data and A/B testing results, ensuring that design improvements translate into tangible business growth.

• Evolving Design Maturity: Contributing to and shaping the processes and standards of a design team that is actively growing its maturity and influence within the company.

• Fast-Paced Environment: Keeping pace with rapid product development cycles and market changes in the dynamic mobile gaming industry.

Learning & Development Opportunities:

• Advanced UI/UX Skills: Deepen expertise in complex mobile UI patterns, microinteractions, animations, and user psychology for engagement.

• Design System Leadership: Take a leading role in evolving and scaling the design system, potentially influencing its adoption across more product areas.

• Data Interpretation & Application: Enhance skills in interpreting user analytics and A/B test results to drive data-informed design decisions.

• Cross-functional Collaboration: Gain experience working closely with product, engineering, and data teams in a high-growth, performance-driven environment.

• Industry Exposure: Work on a product used by millions, within a company aiming to be a "European tech challenger," providing valuable experience for future career growth.

📝 Enhancement Note: The challenges presented are inherent to a senior role at a high-growth tech company in a competitive industry. The growth opportunities are substantial, offering a chance to shape both product and process while advancing one's career.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you owned a feature from concept to launch. What were the biggest challenges, and how did you overcome them?" (Focus on process, ownership, problem-solving, and impact.)

• "How do you approach designing for habit formation and user engagement in a B2C mobile product?" (Discuss psychological principles, gamification, feedback loops, and data-driven iteration.)

• "Walk us through your experience with design systems. How have you contributed to or maintained one, and what are the key benefits?" (Highlight your understanding of scalability, consistency, and designer-developer collaboration.)

• "How do you collaborate with UX researchers and data analysts? Provide an example of how data and user feedback influenced your design decisions." (Emphasize your data-driven approach and ability to translate insights into actionable design.)

• "Given our focus on user acquisition and performance, how would you approach designing a new onboarding flow to maximize conversion?" (Demonstrate your understanding of conversion funnels, user journeys, and A/B testing principles.) Company & Culture Questions:

• "What excites you about exmox and our mission to be a European tech challenger, particularly in the user acquisition space?" (Show you've researched the company and understand its ambitions.)

• "How do you handle constructive criticism or feedback on your designs, especially in a fast-paced environment?" (Highlight your feedback mindset and resilience.)

• "Describe your ideal collaborative environment with product managers and engineers." (Emphasize your proactive, ownership-driven approach and communication skills.)

• "How do you prioritize your workload when faced with multiple competing deadlines and requests?" (Demonstrate your ability to balance speed and quality and focus on what matters most.) Portfolio Presentation Strategy:

• Storytelling: Structure your portfolio presentation as a narrative for each project, detailing the problem, your role, the process, the solution, and the quantifiable results.

• Visual Clarity: Ensure your visuals are high-quality and clearly communicate your design intentions and execution. Use annotations where necessary.

• Focus on Impact: For each project, be prepared to articulate the specific KPIs or metrics that your design influenced. Quantify your success whenever possible.

• Demonstrate Process: Show, don't just tell, your design process. This includes wireframes, user flows, iterations, and how you incorporated feedback.

• Be Ready for Questions: Anticipate questions about your design choices, trade-offs made, and how you would handle hypothetical scenarios related to exmox's product.

📝 Enhancement Note: Interview preparation should focus on demonstrating not just design skills but also a strategic mindset, a data-driven approach, and the ability to thrive in a high-performance, ownership-oriented culture. The emphasis on "designing experiences that perform" means candidates must be prepared to discuss the business impact of their work.

📌 Application Steps

To apply for this Senior UI Designer position:

• Submit your application through the provided link on the exmox job portal.

• Portfolio Customization: Curate your portfolio to prominently feature your strongest mobile UI design work, especially projects demonstrating habit formation, user engagement, and measurable impact on business KPIs. Include case studies that highlight your end-to-end design process and collaboration.

• Resume Optimization: Tailor your resume to include keywords from the job description such as "Figma," "Mobile UI Design," "B2C," "Design Systems," "Motion Design," and "User Acquisition." Quantify your achievements with specific numbers where possible.

• Interview Preparation: Practice presenting your portfolio, focusing on storytelling, articulating your design rationale, and demonstrating the business impact of your work. Prepare answers to strategy and behavioral questions that highlight your ownership, proactivity, and data-driven approach.

• Company Research: Thoroughly research exmox, its mission, the mobile gaming industry, and its position as a "European tech challenger." Understand their focus on user acquisition and performance to better align your application and interview responses with their strategic goals.

⚠️ 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.